Gears..3.31 to???
4/29/10, 06:29 AM
#1
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Gears..3.31 to???
Debating on swapping out the gears. Since stock is 3.31, im thinking either 3.73 or 4.10. I won't be dragging much at all (not enuff time)...except for stop light to stop light. note that these are combined with my 3500 stall TC.
Opinions???
Opinions???
4/29/10, 08:09 AM
#2
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Colby, our automatics work very well with 4.10's. I've often thought I should have gone with 4.30's or 4.56's in retrospect, but the 4.10's are the bare minimum I'd consider for our heavy automatics. My GT is a daily driver, and 4.10's are great on the street (and the occasional trip down the dragstrip). IMO, 3.73's just aren't enough gear for our setups.
4/29/10, 08:45 AM
#4
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xaxaxa FO TENS how ghetto
I went with 4.10's (FO TENS) but haven't installed yet so i can't give any feedback but since you said from ligtht to light definetely 4.10 quicker launch!
I went with 4.10's (FO TENS) but haven't installed yet so i can't give any feedback but since you said from ligtht to light definetely 4.10 quicker launch!
4/29/10, 09:08 AM
#6
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Get a gear calculator spread sheet. You RPMs will increase by about 22% and your MPG will be reduced on the highway by 10 to 12%. I went with 3.73s and have posted numerous times on the observed effects.
4/29/10, 09:31 AM
#7
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I just had 3.73's installed in my auto GT and I really like it. I want to get a PI torque converter some
day and I was worried about traction on the street with 4.10's even before a higher stall converter.
Wayne
day and I was worried about traction on the street with 4.10's even before a higher stall converter.
Wayne
4/29/10, 09:37 AM
#8
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Here Colby. Use this to calculate engine rpm.
http://www.csgnetwork.com/multirpmcalc.html
or this one.
http://www.corral.net/tech/gearcalc.html
http://www.csgnetwork.com/multirpmcalc.html
or this one.
http://www.corral.net/tech/gearcalc.html
Last edited by 70MACH1OWNER; 4/29/10 at 09:40 AM.
4/29/10, 09:40 AM
#9
Depends a bit if you drive more highway or city. The 3.73 is more highway friendly, but the 4.1 exerts less stress on the drivetrain in normal city driving. I have 4.30s in a box still, and while I'm hesitant about the 20% increase in highway rpm, I don't think the amount of highway driving I do is enough for me not to do the swap (I'm at 3.55 now)
4/29/10, 10:43 AM
#11
I didn't buy my GT with gas mileage inmind so I definitely say go with the 4.10's and a nice race tune! Normally I only get about 14 to 16 mpg since I'm usually running around in 3rd gear. Now I did just do a trip from NJ to Florida and back. I averaged 22 mpg (anywhere from 65 to 100ish mph) running Bamachips 93 Street Tune which I'm happy with. My Mustang isn't my DD so gas isn't a concern. I use the Scion xa for my commuter @ 33 mpg w/a 90 mile roundtrip. So if you have a DD def go w/the 4.10's. 
4/29/10, 10:48 AM
#12
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I just picked up my car from install of a 4.10 ring/pinion yesterday. Honestly, it's not enough. In retrospect I should have probably gone with a 4.30.
It completely transforms the car. Even with these 4.10's in the rear I would have no issues putting a blower on this as it sits.
Unless your car spends a majority of it's time on a highway, go with at least a 4.10, if not lower.
It completely transforms the car. Even with these 4.10's in the rear I would have no issues putting a blower on this as it sits.
Unless your car spends a majority of it's time on a highway, go with at least a 4.10, if not lower.
4/29/10, 11:03 AM
#13
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I just picked up my car from install of a 4.10 ring/pinion yesterday. Honestly, it's not enough. In retrospect I should have probably gone with a 4.30.
It completely transforms the car. Even with these 4.10's in the rear I would have no issues putting a blower on this as it sits.
Unless your car spends a majority of it's time on a highway, go with at least a 4.10, if not lower.
It completely transforms the car. Even with these 4.10's in the rear I would have no issues putting a blower on this as it sits.
Unless your car spends a majority of it's time on a highway, go with at least a 4.10, if not lower.
See that's the dilemma I have, 4.10s or 4.30s? I'm afraid I'll want more. Have 3.55's already. I take it your GT is a manual?
4/29/10, 11:07 AM
#15
I just picked up my car from install of a 4.10 ring/pinion yesterday. Honestly, it's not enough. In retrospect I should have probably gone with a 4.30.
It completely transforms the car. Even with these 4.10's in the rear I would have no issues putting a blower on this as it sits.
Unless your car spends a majority of it's time on a highway, go with at least a 4.10, if not lower.
It completely transforms the car. Even with these 4.10's in the rear I would have no issues putting a blower on this as it sits.
Unless your car spends a majority of it's time on a highway, go with at least a 4.10, if not lower.
4/29/10, 11:17 AM
#16
4/29/10, 02:44 PM
#17
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Top of 1st gear is about 35ish which is decent. I've had cars that from the factory are geared lower. So far I haven't noticed myself disliking the shortened 1st gear.
4/29/10, 04:43 PM
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The original posters car is an auto trans car. You need to remember that 1st and 2nd gears in our auto cars are a lower than the manuals. I have heard some say that putting 4.10's in these auto's that 1st gear particularly in very short. Almost useless. Personally I believe 3.90's would be ideal. But Ford racing doesn't offer them.
I have also been considering gears and can't decide between 3.73's or 4.10's. I live in the country and 80% of my driving is 55 mph or above. I sure would like to drive someone's auto with 4.10's before I make a final decision for me.
I have also been considering gears and can't decide between 3.73's or 4.10's. I live in the country and 80% of my driving is 55 mph or above. I sure would like to drive someone's auto with 4.10's before I make a final decision for me.
Last edited by 70MACH1OWNER; 4/29/10 at 06:11 PM.
4/29/10, 06:52 PM
#20
Cobra Member
Thread Starter
Hey Brian or other autos with 4.10's. Any chance you can break down where 1st and 2nd max out at? Believe ive heard u say 70mph was at 2900rpms? Or am i off?