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Old Apr 15, 2010 | 03:05 PM
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Default differential?

Just upgraded engine to approx. 425hp, put in TKO 500 5 speed trans, but diff. is 3.08. Looking for suggestions as to what to go up to.

Wont be any drag, mostly street, some highway.

Thanks
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Old Apr 15, 2010 | 04:16 PM
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Your TKO has a pretty low first gear ratio.
Since you say you dont plan to drag race, I wouldnt change the rear gear.
If you feel like you just have to change it, a 3.55 or 3.73 would work well.
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Old Apr 15, 2010 | 06:01 PM
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Originally Posted by DRIVESHAFT
Your TKO has a pretty low first gear ratio.
Since you say you dont plan to drag race, I wouldnt change the rear gear.
If you feel like you just have to change it, a 3.55 or 3.73 would work well.
It seems like I cant get into 5th gear unless im near 70, anything below and it hesitates, and even in the lower gears not a lot of get up and go untill im pushing hard in third.
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Old Apr 15, 2010 | 06:10 PM
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I don't get into 5th until 70 or until a blue haired grandmother is flashing her highs at me
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Old Apr 15, 2010 | 10:16 PM
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I ran a 3.70 with my TKO 500 and liked it. Little short in 1st gear but yo uget used to it. A 3.08 and the .68 OD you will rarely use 5th gear. With a 3.70 5th is useable from about 55 on up. A 3.55 is also a good gear. Either one will work well.
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Old Apr 16, 2010 | 12:58 AM
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Depends on your engine build. If you don't have many Cubic Inchs and a lot of Cam then its not going to pull 5th down the Freeway very well. If You have a lot of CI and not much cam its going to pull 5th before you get to the freeway. The TKO's 1st gear was made for a ratio close to what you have. You mght even consider a 3.36. As they were a stock option they are fairly common You might be able to pick up a used unit and try it out before you spend a lot re-doing what you have.
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