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Rear axle question

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Old 11-17-11, 04:23 PM
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TN Rear axle question

Are the rear end ratios different on a automatic FD and a 5 speed FD????
Thanks
Old 11-17-11, 04:32 PM
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Yes I don't remember right off hand you might try the faq.
Old 11-17-11, 04:42 PM
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3.90 Automatic
4.10 5 speed
4.30 Later model (The fancy spancy versions) 5 speed.
Old 11-17-11, 07:23 PM
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Old 11-17-11, 08:57 PM
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I'm swaping a 5 speed into an automatic car.
Should I leave the auto rear end on the car or change out to the 5 speed rear end.??
What would be the +'s and -'s of either way??
Thanks
Old 11-17-11, 09:02 PM
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https://www.rx7club.com/showthread.p...ic+manual+swap
Old 11-20-11, 02:23 PM
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Originally Posted by blake29
I'm swaping a 5 speed into an automatic car.
Should I leave the auto rear end on the car or change out to the 5 speed rear end.??
What would be the +'s and -'s of either way??
Thanks

It depends on the power your engine is making and car usage.
Mine is around 400 whp and a street car. I went 3.90 to reduce tire spin in 1st and 2nd gears. Which it helps. But I also went with the .806 5th.
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Old 11-21-11, 05:24 PM
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I found a 5th gear error for running 255 tires with 4.1 diff.

Corrected:

4.10: 1st 38, 2nd 66, 3rd 95, 4th 133, 5th 165 - 22 mph per 1K rpm in 5th gear.
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