GT Performance Mods 2005+ Mustang GT Performance and Technical Information

Gear Upgrade

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Old 5/12/06, 01:00 PM
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Gear Upgrade

Just did my gears and was wondering what grade and brand gear oil everyone was using I put in Mobil 1 synthetic 75/90 of course with some friction modifier which is about half the price of the synthetic 75/140 specified in the manual
any thoughts?
Old 5/12/06, 01:52 PM
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I just went with synthetic. I had my 3.73's done about two weeks ago. No problems. What are your thoughts on the gears??????
Old 5/12/06, 02:08 PM
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I can't belive the difference in power thinking I am in the low 13's now
Old 5/12/06, 06:35 PM
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I cannot wait for mine. I am putting in FRPP 4.10's and they use royal purple I believe.
Old 5/12/06, 08:05 PM
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I just don't understand gears. I hear a lot about 4.10's and all that but what if you have an automatic car?
Old 5/12/06, 08:27 PM
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I used 75/140 Amsoil with friction modifier. Don't cut corners when it comes to lubricants, personal or otherwise!
Old 5/14/06, 01:41 PM
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Mustang Kid,

I think gears will even help out a automatic. Ford upgraded the stock gearing for the Hertz to put in 3.55's instead of the stock ones. I am guessing that a new torque converter and gears would do wonders to your auto.
Old 5/14/06, 03:11 PM
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Originally Posted by GRAYPNY
Don't cut corners when it comes to lubricants, personal or otherwise!
amen!!
Old 5/14/06, 10:22 PM
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I'd be using Ford recommended synthetic 75/140 if I was living in Texas simply because of the extreme heat there.
Old 5/15/06, 12:19 AM
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lesson learned, I could hear the diff slipping as I drove around corners after the rear end got warm mabey 10 or 15 miles of driving. after I would let it sit long enough it would stop until it warmed back up.
Draining it now and going to go with Royal Purple 75/140. anyone else have to look around to find some gear oil it seems almost everyone was out of the 75/140 or only had one or two quarts
Old 5/15/06, 07:49 AM
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Originally Posted by mustangkid18
I just don't understand gears. I hear a lot about 4.10's and all that but what if you have an automatic car?
I have an automatic and the 3.73's made a very noticable difference. I can't imagine what 4.10's would feel like.
Old 5/15/06, 10:26 AM
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Originally Posted by OKLACOP
I can't imagine what 4.10's would feel like.
Simply amazing... they are the perfect ratio for the auto tranny,
Old 5/15/06, 06:22 PM
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Originally Posted by don_w
Simply amazing... they are the perfect ratio for the auto tranny,

Don't tell him that Don after he just put the other gears in!
Old 5/15/06, 07:36 PM
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How much do they cost and where could I get some? I am interested now!
Old 5/16/06, 05:21 PM
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Originally Posted by GRAYPNY
I used 75/140 Amsoil with friction modifier. Don't cut corners when it comes to lubricants, personal or otherwise!
But won't that degrade the latex?
Old 5/16/06, 06:25 PM
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Originally Posted by GRAYPNY
Don't tell him that Don after he just put the other gears in!
Sometimes the truth hurts a little. lol
Old 5/17/06, 04:35 PM
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Originally Posted by Rebel73
But won't that degrade the latex?
omg roflmao :LOL:
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