Swapping 4th gear ratio?

sailwa66 · **Joined:** Mon May 14, 2012 9:57 am **Posts:** 32

Since the 66RFE is basically a 545RFE case stuffed with 68RFE gears, does anyone know if replacing our 4th (well, kinda-5th) gear with a 66/68RFE 5th gear is a drop-on?

This would change the ratio from 0.75:1 to 0.81:1, thereby eliminating the too-large 3rd-4th gap, and too small 4th-5th gap. I'm sure Kieth could then tailor a trans cal for me.

jlgail4309 · **Posted:** Thu Feb 06, 2014 5:29 pm

That sound great. Transmission shop might be the only way to find out!!

tjkj2002 · **Posted:** Thu Feb 06, 2014 5:41 pm

sailwa66 wrote:

Since the 66RFE is basically a 545RFE case stuffed with 68RFE gears, does anyone know if replacing our 4th (well, kinda-5th) gear with a 66/68RFE 5th gear is a drop-on?

This would change the ratio from 0.75:1 to 0.81:1, thereby eliminating the too-large 3rd-4th gap, and too small 4th-5th gap. I'm sure Kieth could then tailor a trans cal for me.

The gap between the higher gears in a 545RFE is very small compared to the lower gears.Would be a lot of $$$ for no noticeable difference.

-1st 3.00:1
-2nd 1.67:1
-2nd Prime 1.50:1
-3rd 1.00:1
-4th 0.75:1
-5th 0.67:1

-Reverse 3.00:1

Swapping 4th gear ratio?

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