Changing gear ratios on 4T60-E
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Certified GM nut
Joined: Mar 2005
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From: New Milford, CT
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?
Retired
Certified Car Nut
Joined: Jul 2003
Posts: 17,960
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From: Dark Side, AZ
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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caminated2k
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Jun 4, 2019 04:57 PM
