This isn’t a transmission you’re going to build correctly, using an ATSG assembly manual or a YouTube video. There are too many “builders” out there who are promising things that are above their grade levels. The BIGGEST problem with the 4L60E is the huge lack of knowledge and qualified builders. How can we do this, while many claim these transmissions won’t hold up in a typical 300 horsepower application? While the stock 4L60E has numerous design flaws and weak areas, they can all be corrected. We currently have our Ultra Pro Race builds eclipsing 1200 horsepower in C5 Corvettes. 'CPT specializes on racing and performance 4L60Es. My confidence in this transmission is going downhill quickly.A note about the 4L60E, from our Founder, Frank Cahall. 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.

Corvette servo 4l60e