I got the tranny rebuilt (with a basic shift kit) and almost 200K miles later, it was still going strong. It had a new GM Goodwrench engine, but the 700 R4 tranny was on its way out.
Eventually I ended up buying a used S-10 Blazer. While growing up and early on in my 'driving' years, I preferred manual trannys over automatics. It is easy to rebuild and can be strengthened to handle significant horsepower and torque. My confidence in this transmission is going downhill quickly.Although there are folks who hate the 4L60 with a passion and the 4L80 is recognized as a much stronger unit, the 4L60 has gained much fame in the performance and aftermarket arenas. The one in there is for a 4.3L so the brain trust that rebuilt the transmission didn't even put the right torque converter in it. I also talked to the company that made the torque converter (PDQ) that's currently in the 4L60e and they told me it was the wrong converter. Maybe upgraded springs in the valve body but it was overhauled since then so all the upgrades were probably long gone before pulled it out and put the TransGo shift kit in.
I message Tranzman ask him about this 4L60 he told me it's probably nothing special. The case number (6CPD) C- police Truck 4L60e. Going by the mileage from 2017 to when the title was junked on 04/15/21.The 4L60 has approximately 52,388 miles on it. From what the Carfax says, it looks like the transmission was overhauled May of 2017. Looks like the same person owned it until it ended up at pick n pull. Then there is a year gap and the 06 Tahoe shows up here in California October 17th of 2014.
The title change hands four times in October of 2013. It used to be NYPD vehicle came into service on retired and sold on. Did a Carfax on the 2006 Tahoe My 4L60 came out of.
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