Changing gear ratios on 4T60-E
#1
Senior Member
Certified GM nut
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Changing gear ratios on 4T60-E
I've got a '97 SE with the 2.84 gear ratio (F17). Now, it feels like it'* almost time for a rebuild, and from looking at local junkyards, it seems like the 3.06 gear ratios (FW2) are a couple of bucks cheaper.
After searching the forum, I didn't find any definite answers. If I bought a good 3.06-geared transmission, made sure it was okay, and threw in a shift kit, would I only need a PCM tune to recognize the new gear ratio?
After searching the forum, I didn't find any definite answers. If I bought a good 3.06-geared transmission, made sure it was okay, and threw in a shift kit, would I only need a PCM tune to recognize the new gear ratio?
#2
Retired
Wow, that'* weird. I went from a 3.06 to a 2.84 trans a couple years ago. Never changed the PCM, only thing that happend was my PCM changed gears about 200RPM to early. In your case, the PCM would change gears about 200RPM late.
Yup, swap trans, change the PCM.
Yup, swap trans, change the PCM.
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2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
Retired Administrator
2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
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