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I thought the correct gear to do it was in 5th for the 1:1 ratio?

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Old 10-21-2011, 12:41 PM   #1 (permalink)
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I thought the correct gear to do it was in 5th for the 1:1 ratio?
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Old 10-21-2011, 10:35 PM   #2 (permalink)
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Originally Posted by Pelican170 View Post
I thought the correct gear to do it was in 5th for the 1:1 ratio?
It is, but untuned 7AT's will hit the limiter and need to dyno in 4th, so most drf's from the auto or based on 4th gear runs.

Also, 4th puts less wear on the motor... mine was not very happy going 170 mph on a 98* F 90% humidity day just to try and see 2-3 more lbft of peak torque

Anyway, the difference is really small in output between 4th and 5th -- literally only a few whp/tqs. You can dyno in either just fine, and get accurate and virtually identical values, although technically 5th would be the correct one in terms of gear ratio.
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