People I'm still on the fence about - FLT, PATC. People I've personally judged know what the hell they are doing with a 4L60: Rossler, Chris Kokkonis (CK Performance), Art Carr, Zippy, Toy Shop. Another thing to consider - even after you have a 'bulletproof' 4L60 expect to have it out of the truck every 2-3 years for new clutches anyways as normal wear & tear don't think that you will get 100K-miles out of it between rebuilds, that's not realistic for a 4L60 working as hard as these ones have to in order to cope with the weight/power of these trucks. At this point my transmission has consumed $5K and 4-months of downtime (in 3 years) and if I had realized that up-front I would have just bought a top of the line 4L60 to begin with from a proven professional that specializes in 4L60 builds since they are so different from other tranny builds ideas that work in a 4L60 do not work in a TH350/400, C6, Torqueflight, etc and vice-versa, the 4L60 is a 'different animal'. I am confident this time in my own build that I've just about overcome all the gremlins in my 4L60 buildup but it took several tries and admittedly a couple tranny builders as well. The 4L60 transmission is very unforgiving, you've got to have all the right components just so or the thing will not last and there are only a handful of people I've seen in the last 3 years that have proven they can deliver a 4L60 which can take the punishment especially in the AWD trucks (which are like driving on drag slicks all the time, 100% traction).įactory deficiencies that must be addressed are 3-4 clutch pack failure (which is rampant btw), improved reaction carrier/shell and other hard parts, improved band & clutch materials, correct recipie of shift kit valving & servos. My advice: the transmission is THE problem component in this truck, and if you plan on keeping the truck for any length of time (like more than 3-4 years IMO) then I highly recommend you spend the money and buy the best damned transmission you can afford from a proven 4L60 builder. First time was my fault, I made a mistake installing the Vette servo and the tranny had to come out to correct the problem second time was 6-months ago and now three weeks ago. Mr P has blown his.This is the 3rd time I've had the transmission out of my truck.
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