Rear main seal
U-joints
Ring gear teeth
U-joints
Ring gear teeth
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Before I had my 4L60E rebuilt in my 97, I programmed it with a Jet hand held tuner. It made the trans shift so much quicker. In February, I blew the rear end, the 2 weeks later the trans. So I rebuilt the rear end. 373s with an Eaton trutrack. When the trans blew, I had it rebuilt at a trans shop. HD master rebuild kit with Corvette servo's. It shifts as quick with the OE program for the trans, as it did with the program, and the OE trans did. It will bark second gear. It cost me $1100 to do the rear end, and 2 weeks later, $2800 to do the trans. I did all of the work on the rear end my self, but I didn't touch anything on the trans. Just drove the truck there with no R or 4 gear I think it was. The rebuilt trans has a 2 year 24,000 mile warranty. I'm very happy with there work.I cannot believe how quick this transmission shifts, it's even quicker that my ole' porsche 911!