S197 wont roll
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S197 wont roll
I have a 2006 Mustang GT 5spd manual.
Few months back I had my gears swapped to the Ford Performance 3.73 kit and had a shop install it. Lately Ive noticed a whining noise coming from the rear end of the car. Its apparent in all gears at all speeds but drowns out by exhaust as I go faster. I also hear it when in neutral coasting or with clutch down also. Its easily noticeable when I am making a turn.
Recently when pulling out of a stop light and I am shifting through the gears, once I get into 3rd I noticed my rpms dying down and I hear a loud clunking noise. So I go into neutral and try to coast into a safe place. Without me braking and I am still rolling at about 5mph. The vehicle just stops, as if I slammed the brakes but I didnt.
I then couldnt push it forward or backwards while in neutral. I got it towed home and some how it wanted to roll down the bed of the tow truck. Then I started it up and eased it into the driveway.
I had to move my car a bit to pull out my generator, so I push it a bit while in neutral and maybe 4 feet later I hear a click and then it stops dead in its track again. Wont go forwards or backwards.
Heres all the information I have gotten from testing stuff out yesterday:
I can start the car in first gear with clutch down.
I can also start it in neutral clutch down.
I can also rev the car in neutral and first gear in neutral.
Idling Rpms are also good
I can move my shifter into any gear with the car off clutch in, I can also move the shifter into any gear, car started, clutch down.
I some how was able to throw it into reverse and it went back just fine but if I go into first and ease off clutch the car stalls out. It feels like it wants to go forwards but feels like its straining or something is stopping it and making it stall.
I lifted the rear end and tried rotating the wheels, both rear tires rotate same direction but takes a good amount of force compared to what I remember.
Put down rear end I then tried pushing it forwards or backwards and it rolls just fine in neutral.
I then tried with it in First gear with the clutch down and it stops in its tracks again.
Lift rear end again and now the wheels dont want to rotate
I am leaning towards differential. I think getting a new carrier and 4.10 gears should be enough to fix whatever was done. Possibly shop installed the 3.73 improperly???
Any input would be greatly appreciated.
Few months back I had my gears swapped to the Ford Performance 3.73 kit and had a shop install it. Lately Ive noticed a whining noise coming from the rear end of the car. Its apparent in all gears at all speeds but drowns out by exhaust as I go faster. I also hear it when in neutral coasting or with clutch down also. Its easily noticeable when I am making a turn.
Recently when pulling out of a stop light and I am shifting through the gears, once I get into 3rd I noticed my rpms dying down and I hear a loud clunking noise. So I go into neutral and try to coast into a safe place. Without me braking and I am still rolling at about 5mph. The vehicle just stops, as if I slammed the brakes but I didnt.
I then couldnt push it forward or backwards while in neutral. I got it towed home and some how it wanted to roll down the bed of the tow truck. Then I started it up and eased it into the driveway.
I had to move my car a bit to pull out my generator, so I push it a bit while in neutral and maybe 4 feet later I hear a click and then it stops dead in its track again. Wont go forwards or backwards.
Heres all the information I have gotten from testing stuff out yesterday:
I can start the car in first gear with clutch down.
I can also start it in neutral clutch down.
I can also rev the car in neutral and first gear in neutral.
Idling Rpms are also good
I can move my shifter into any gear with the car off clutch in, I can also move the shifter into any gear, car started, clutch down.
I some how was able to throw it into reverse and it went back just fine but if I go into first and ease off clutch the car stalls out. It feels like it wants to go forwards but feels like its straining or something is stopping it and making it stall.
I lifted the rear end and tried rotating the wheels, both rear tires rotate same direction but takes a good amount of force compared to what I remember.
Put down rear end I then tried pushing it forwards or backwards and it rolls just fine in neutral.
I then tried with it in First gear with the clutch down and it stops in its tracks again.
Lift rear end again and now the wheels dont want to rotate
I am leaning towards differential. I think getting a new carrier and 4.10 gears should be enough to fix whatever was done. Possibly shop installed the 3.73 improperly???
Any input would be greatly appreciated.
Administrator clevparts@aol.com
Joined: November 27, 2004
Posts: 12,515
Likes: 4,278
From: Visalia Ca.
Quote
I am leaning towards differential. I think getting a new carrier and 4.10 gears should be enough to fix whatever was done. Possibly shop installed the 3.73 improperly???
YES!
Best Guess Without Popping Rear Cover and Inspecting!
Installing Rear End Gears Takes The Right Mechanic. 35+ Years Working at FORD Dealers in Parts and Very Seldom Did We Have More Than One Guy in The Shop Who Would Do Gears and They Usually Did Not Want To Do Them as They Were So Hard To do Correctly!
BTMO
KC
I am leaning towards differential. I think getting a new carrier and 4.10 gears should be enough to fix whatever was done. Possibly shop installed the 3.73 improperly???
YES!
Best Guess Without Popping Rear Cover and Inspecting!
Installing Rear End Gears Takes The Right Mechanic. 35+ Years Working at FORD Dealers in Parts and Very Seldom Did We Have More Than One Guy in The Shop Who Would Do Gears and They Usually Did Not Want To Do Them as They Were So Hard To do Correctly!
BTMO
KC
Thread Starter
Member
Joined: September 26, 2025
Posts: 5
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Originally Posted by 05stangkc;[url=tel:7092790
7092790[/url]]Quote
I am leaning towards differential. I think getting a new carrier and 4.10 gears should be enough to fix whatever was done. Possibly shop installed the 3.73 improperly???
YES!
Best Guess Without Popping Rear Cover and Inspecting!
Installing Rear End Gears Takes The Right Mechanic. 35+ Years Working at FORD Dealers in Parts and Very Seldom Did We Have More Than One Guy in The Shop Who Would Do Gears and They Usually Did Not Want To Do Them as They Were So Hard To do Correctly!
BTMO
KC
I am leaning towards differential. I think getting a new carrier and 4.10 gears should be enough to fix whatever was done. Possibly shop installed the 3.73 improperly???
YES!
Best Guess Without Popping Rear Cover and Inspecting!
Installing Rear End Gears Takes The Right Mechanic. 35+ Years Working at FORD Dealers in Parts and Very Seldom Did We Have More Than One Guy in The Shop Who Would Do Gears and They Usually Did Not Want To Do Them as They Were So Hard To do Correctly!
BTMO
KC
Ive read the reviews and he has 4.7/5 stars, does this seek legit and I could actually be back on the road. Just scared for another shop to f me over.
Administrator clevparts@aol.com
Joined: November 27, 2004
Posts: 12,515
Likes: 4,278
From: Visalia Ca.
Have You Discussed Issue With Installing Shop?? Also Gears Can Get Damaged in Shipping and Have Cracks in Them. Could Be a Parts Issue. Did The Gears You Bought Have any Warranty on Them?? I Would Not Be Eating a Repair That Was a Few Months Old! At The Very Least Some Kind of Refund!
KC
KC
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Member
Joined: September 26, 2025
Posts: 5
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Originally Posted by 05stangkc;[url=tel:7092792
7092792[/url]]Have You Discussed Issue With Installing Shop?? Also Gears Can Get Damaged in Shipping and Have Cracks in Them. Could Be a Parts Issue. Did The Gears You Bought Have any Warranty on Them?? I Would Not Be Eating a Repair That Was a Few Months Old! At The Very Least Some Kind of Refund!
KC
KC
Im okay with paying for new parts since I wanted to do 4.10 gears instead with it no longer being my daily. Realistically I can cough up the $795 labor and have all parts ordered in Jan, after holidays. I just want it up and running again and done right.
Administrator clevparts@aol.com
Joined: November 27, 2004
Posts: 12,515
Likes: 4,278
From: Visalia Ca.
Well Being in Florida There are Ton's Of Good Shops Out There. If It Were me And I Had Not Heard Any Good Word of Mouth on a Particulary Good Rear End Shop in Your Area I Would Go To a Local Car Show & Gravitate Towards Any Modified Mustang Owner & Ask Around About Any Good Places To Go!
KC
FRPP R&P May Have Some Coverage!
Save All Old Parts & Keep Any Documentation You Have & When New Installer Puts In Gears Try & Get Documentation If He Thinks it Was a Part Failure! Would Not Hurt To See If American Muscle Can Help As Well!
The Squeeky Wheel gets The Grease as Long As In This Case it Was Part Failure Not Install Issue!
https://performanceparts.ford.com/part/M-4209-88373
KC
FRPP R&P May Have Some Coverage!
Save All Old Parts & Keep Any Documentation You Have & When New Installer Puts In Gears Try & Get Documentation If He Thinks it Was a Part Failure! Would Not Hurt To See If American Muscle Can Help As Well!
The Squeeky Wheel gets The Grease as Long As In This Case it Was Part Failure Not Install Issue!
https://performanceparts.ford.com/part/M-4209-88373
SUPERCHARGED RED ROCKET ------------------Master-Moderator
Joined: May 11, 2006
Posts: 10,644
Likes: 2,509
From: Carnegie, PA
I have a 2006 Mustang GT 5spd manual.
Few months back I had my gears swapped to the Ford Performance 3.73 kit and had a shop install it. Lately Ive noticed a whining noise coming from the rear end of the car. Its apparent in all gears at all speeds but drowns out by exhaust as I go faster. I also hear it when in neutral coasting or with clutch down also. Its easily noticeable when I am making a turn.
Recently when pulling out of a stop light and I am shifting through the gears, once I get into 3rd I noticed my rpms dying down and I hear a loud clunking noise. So I go into neutral and try to coast into a safe place. Without me braking and I am still rolling at about 5mph. The vehicle just stops, as if I slammed the brakes but I didnt.
I then couldnt push it forward or backwards while in neutral. I got it towed home and some how it wanted to roll down the bed of the tow truck. Then I started it up and eased it into the driveway.
I had to move my car a bit to pull out my generator, so I push it a bit while in neutral and maybe 4 feet later I hear a click and then it stops dead in its track again. Wont go forwards or backwards.
Heres all the information I have gotten from testing stuff out yesterday:
I can start the car in first gear with clutch down.
I can also start it in neutral clutch down.
I can also rev the car in neutral and first gear in neutral.
Idling Rpms are also good
I can move my shifter into any gear with the car off clutch in, I can also move the shifter into any gear, car started, clutch down.
I some how was able to throw it into reverse and it went back just fine but if I go into first and ease off clutch the car stalls out. It feels like it wants to go forwards but feels like its straining or something is stopping it and making it stall.
I lifted the rear end and tried rotating the wheels, both rear tires rotate same direction but takes a good amount of force compared to what I remember.
Put down rear end I then tried pushing it forwards or backwards and it rolls just fine in neutral.
I then tried with it in First gear with the clutch down and it stops in its tracks again.
Lift rear end again and now the wheels dont want to rotate
I am leaning towards differential. I think getting a new carrier and 4.10 gears should be enough to fix whatever was done. Possibly shop installed the 3.73 improperly???
Any input would be greatly appreciated.
Few months back I had my gears swapped to the Ford Performance 3.73 kit and had a shop install it. Lately Ive noticed a whining noise coming from the rear end of the car. Its apparent in all gears at all speeds but drowns out by exhaust as I go faster. I also hear it when in neutral coasting or with clutch down also. Its easily noticeable when I am making a turn.
Recently when pulling out of a stop light and I am shifting through the gears, once I get into 3rd I noticed my rpms dying down and I hear a loud clunking noise. So I go into neutral and try to coast into a safe place. Without me braking and I am still rolling at about 5mph. The vehicle just stops, as if I slammed the brakes but I didnt.
I then couldnt push it forward or backwards while in neutral. I got it towed home and some how it wanted to roll down the bed of the tow truck. Then I started it up and eased it into the driveway.
I had to move my car a bit to pull out my generator, so I push it a bit while in neutral and maybe 4 feet later I hear a click and then it stops dead in its track again. Wont go forwards or backwards.
Heres all the information I have gotten from testing stuff out yesterday:
I can start the car in first gear with clutch down.
I can also start it in neutral clutch down.
I can also rev the car in neutral and first gear in neutral.
Idling Rpms are also good
I can move my shifter into any gear with the car off clutch in, I can also move the shifter into any gear, car started, clutch down.
I some how was able to throw it into reverse and it went back just fine but if I go into first and ease off clutch the car stalls out. It feels like it wants to go forwards but feels like its straining or something is stopping it and making it stall.
I lifted the rear end and tried rotating the wheels, both rear tires rotate same direction but takes a good amount of force compared to what I remember.
Put down rear end I then tried pushing it forwards or backwards and it rolls just fine in neutral.
I then tried with it in First gear with the clutch down and it stops in its tracks again.
Lift rear end again and now the wheels dont want to rotate
I am leaning towards differential. I think getting a new carrier and 4.10 gears should be enough to fix whatever was done. Possibly shop installed the 3.73 improperly???
Any input would be greatly appreciated.
I finally ended up having to purchase a new set of 3:55 gears and had my local Ford dealership do the reinstallation... Needless to say, after the Ford technician examined the 3:55 gears which the previous shop owner installed, he did confirm they were in fact not set up properly which resulted in causing the 3:55s to produce the loud whining noises...
By the time, it was all said and done, I ended up forking out an additional $1,500.00 for parts and labor.... At any rate, a very hard lesson learned the hard way...
Last edited by m05fastbackGT; Sep 26, 2025 at 03:11 PM.
Administrator clevparts@aol.com
Joined: November 27, 2004
Posts: 12,515
Likes: 4,278
From: Visalia Ca.
One Reason I Never Went to the 3.73's My Shelby Would Love! Expensive & Hard To Find a Good Rear End Tech. Should Have Done it When I Was Still at Clevenger. It if Had Gone Bad There They Would have Made it Right! Should Have Been a Factory Option. I was already Paying I Think it Was a 3K$$$ Gas Guzzler Tax! OUCH!
KC
KC
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Originally Posted by m05fastbackGT;[url=tel:7092796
7092796[/url]]I went through a similar experience several years ago when taking my 2006 GT to a shop that somebody referred... After he uninstalled the previous 4:10's and reinstalled the stock 3:55 gears, I also noticed the same loud whining noises which I never encountered with the 4:10s... After numerous complaints with the shop owner, he finally agreed to reimburse me for the labor costs, but not for 3:55 gears that he ruined, by not setting them up properly....
I finally ended up having to purchase a new set of 3:55 gears and had my local Ford dealership do the reinstallation... Needless to say, after the Ford technician examined the 3:55 gears which the previous shop owner installed, he did confirm they were in fact not set up properly which resulted in causing the 3:55s to produce the loud whining noises...
By the time, it was all said and done, I ended up forking out an additional $1,500.00 for parts and labor.... At any rate, a very hard lesson learned the hard way...
I finally ended up having to purchase a new set of 3:55 gears and had my local Ford dealership do the reinstallation... Needless to say, after the Ford technician examined the 3:55 gears which the previous shop owner installed, he did confirm they were in fact not set up properly which resulted in causing the 3:55s to produce the loud whining noises...
By the time, it was all said and done, I ended up forking out an additional $1,500.00 for parts and labor.... At any rate, a very hard lesson learned the hard way...
Administrator clevparts@aol.com
Joined: November 27, 2004
Posts: 12,515
Likes: 4,278
From: Visalia Ca.
You Had 3.55's! That's a Great Gear! Not to Beat You Down But The Difference Between Those and The 3.73's Are Nil. Now if You Had The 3.31's To 3.73 You Would Notice. Now Going From 3.55's to 4.10's Yes You Will Notice.So Going Down Another Notch is a Good Choice at This Point! BTMO!
As Far as Dealers So Few Are Any Good These Days. That is My Experience in My Area. Of All The Dealers I Worked At Over The years only a Couple Were Worth a **** and Now That I'm Retired and My Best Dealership Being Sold Twice Since I Left There is Not One I Wouldn Feel Comfortable Doing Work on My Cars!
Crappy Deal!
On a Side Note!
I Had an 05 Gt With 3.31's, My 07 GT/CS Had 3.55's But it was Roushcharged & Did Not Need Any More Gear! For Whatever Reason The 07-09 Shelby Gt-500's Had 3.31's and With The Dual Disc Clutch Always Launch Weird. The Kr's Had 3.73's and Drove So Much Better, Weird Deal, I Have talked To Other 500 Owners & They Agree! So a 3.73 in a 500 is a Real Upgrade!
KC
As Far as Dealers So Few Are Any Good These Days. That is My Experience in My Area. Of All The Dealers I Worked At Over The years only a Couple Were Worth a **** and Now That I'm Retired and My Best Dealership Being Sold Twice Since I Left There is Not One I Wouldn Feel Comfortable Doing Work on My Cars!
Crappy Deal!
On a Side Note!
I Had an 05 Gt With 3.31's, My 07 GT/CS Had 3.55's But it was Roushcharged & Did Not Need Any More Gear! For Whatever Reason The 07-09 Shelby Gt-500's Had 3.31's and With The Dual Disc Clutch Always Launch Weird. The Kr's Had 3.73's and Drove So Much Better, Weird Deal, I Have talked To Other 500 Owners & They Agree! So a 3.73 in a 500 is a Real Upgrade!
KC
Thread Starter
Member
Joined: September 26, 2025
Posts: 5
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You Had 3.55's! That's a Great Gear! Not to Beat You Down But The Difference Between Those and The 3.73's Are Nil. Now if You Had The 3.31's To 3.73 You Would Notice. Now Going From 3.55's to 4.10's Yes You Will Notice.So Going Down Another Notch is a Good Choice at This Point! BTMO!
As Far as Dealers So Few Are Any Good These Days. That is My Experience in My Area. Of All The Dealers I Worked At Over The years only a Couple Were Worth a **** and Now That I'm Retired and My Best Dealership Being Sold Twice Since I Left There is Not One I Wouldn Feel Comfortable Doing Work on My Cars!
Crappy Deal!
On a Side Note!
I Had an 05 Gt With 3.31's, My 07 GT/CS Had 3.55's But it was Roushcharged & Did Not Need Any More Gear! For Whatever Reason The 07-09 Shelby Gt-500's Had 3.31's and With The Dual Disc Clutch Always Launch Weird. The Kr's Had 3.73's and Drove So Much Better, Weird Deal, I Have talked To Other 500 Owners & They Agree! So a 3.73 in a 500 is a Real Upgrade!
KC
As Far as Dealers So Few Are Any Good These Days. That is My Experience in My Area. Of All The Dealers I Worked At Over The years only a Couple Were Worth a **** and Now That I'm Retired and My Best Dealership Being Sold Twice Since I Left There is Not One I Wouldn Feel Comfortable Doing Work on My Cars!
Crappy Deal!
On a Side Note!
I Had an 05 Gt With 3.31's, My 07 GT/CS Had 3.55's But it was Roushcharged & Did Not Need Any More Gear! For Whatever Reason The 07-09 Shelby Gt-500's Had 3.31's and With The Dual Disc Clutch Always Launch Weird. The Kr's Had 3.73's and Drove So Much Better, Weird Deal, I Have talked To Other 500 Owners & They Agree! So a 3.73 in a 500 is a Real Upgrade!
KC
Administrator clevparts@aol.com
Joined: November 27, 2004
Posts: 12,515
Likes: 4,278
From: Visalia Ca.
Sounds Like it Was a Sweet Spot in your Case!
That's Cool!
If You Want To Calculate Rpm's With Different Gears & Tires Here is a Good Tool Thread!
https://themustangsource.com/forums/...ulator-549545/
KC
That's Cool!
If You Want To Calculate Rpm's With Different Gears & Tires Here is a Good Tool Thread!
https://themustangsource.com/forums/...ulator-549545/
KC
SUPERCHARGED RED ROCKET ------------------Master-Moderator
Joined: May 11, 2006
Posts: 10,644
Likes: 2,509
From: Carnegie, PA
I called one Ford dealership and they said they would only touch it if I am wanting the whole rear end replaced, axles included. Another dealership said they would do it at $165 an hr but it would be 15hrs of labor. And now thinking about it, that shop never gave me my stock 3.55s lol.
You Had 3.55's! That's a Great Gear! Not to Beat You Down But The Difference Between Those and The 3.73's Are Nil. Now if You Had The 3.31's To 3.73 You Would Notice. Now Going From 3.55's to 4.10's Yes You Will Notice.So Going Down Another Notch is a Good Choice at This Point! BTMO!
As Far as Dealers So Few Are Any Good These Days. That is My Experience in My Area. Of All The Dealers I Worked At Over The years only a Couple Were Worth a **** and Now That I'm Retired and My Best Dealership Being Sold Twice Since I Left There is Not One I Wouldn Feel Comfortable Doing Work on My Cars!
Crappy Deal!
On a Side Note!
I Had an 05 Gt With 3.31's, My 07 GT/CS Had 3.55's But it was Roushcharged & Did Not Need Any More Gear! For Whatever Reason The 07-09 Shelby Gt-500's Had 3.31's and With The Dual Disc Clutch Always Launch Weird. The Kr's Had 3.73's and Drove So Much Better, Weird Deal, I Have talked To Other 500 Owners & They Agree! So a 3.73 in a 500 is a Real Upgrade!
KC
As Far as Dealers So Few Are Any Good These Days. That is My Experience in My Area. Of All The Dealers I Worked At Over The years only a Couple Were Worth a **** and Now That I'm Retired and My Best Dealership Being Sold Twice Since I Left There is Not One I Wouldn Feel Comfortable Doing Work on My Cars!
Crappy Deal!
On a Side Note!
I Had an 05 Gt With 3.31's, My 07 GT/CS Had 3.55's But it was Roushcharged & Did Not Need Any More Gear! For Whatever Reason The 07-09 Shelby Gt-500's Had 3.31's and With The Dual Disc Clutch Always Launch Weird. The Kr's Had 3.73's and Drove So Much Better, Weird Deal, I Have talked To Other 500 Owners & They Agree! So a 3.73 in a 500 is a Real Upgrade!
KC
The reason behind Ford/SVT's decision for the stock 3:31 gear ratio for the 07-09 Shelby GT500 was due mostly for highway driving applications and fuel economy purposes...
As for the KR's, those were not built-in house by Ford/SVT, but rather sent to Shelby American for the KR conversion upgrade package... This would explain the reason the KR's came installed with 3:73 gear ratio over the stock GT500's 3:31 gear ratio...
Last edited by m05fastbackGT; Sep 27, 2025 at 03:55 PM.
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