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Taller gears for auto?

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jwahl16

10+ Year Contributor
428
3
Oct 26, 2009
Havertown, Pennsylvania
I have read about the taller 5th gears for manual transmissions that help to bring the rpms down at highway speeds. I was wondering if IPT or someone has made anything for automatics to help lower the rpms. It would be a great gas saver! Oh, and i'm definitely looking for info on 4g63t trannys, not 420as.
 
The way the automatic transmission works makes it near impossible to have a taller final gear without affecting all the other gears. We don't have that option.

Depending on the clearance you have, you may be able to fit a slightly larger tire to help out.
 
Custom front gears 55-18 with an RVR 29-27 TC = 2.844827586 to a 2.846153846 rear diff 37-13 < Rear diff from an RVR man N/T
But your 1st take off will be sad & 2nd gear cornering will be way under turbo spool time.
Cheers !
 
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