No more slammed shifts, no more burnt fluid, TCC locked perfectly every time. Well, then I found I needed other parts because seals don't come apart cleanly, etc, but after getting it all back together, IT WORKED. As a last ditch effort hoping that I wouldn't have to replace/rebuild the transmission, I bought that kit.
#Sonnax 4l60e shift kit code
I ran across the Transgo SK-4L60E shift kit that while I still didn't have that code I was having a lot of the other symptoms. I battled this problem years ago in my old 1998 Camaro that had the 4L60E, until it got to the point of neck-snapping 1-2 shifts and still not being able to figure it out. One side effect is the computer realizes something isn't right, and then it starts to slam the 1-2 shift extremely hard via jacking the line pressures way up in an attempt to compensate for the issue.
This SHOULD throw a code P1870 "Transmission component slipping" but it doesn't always. The TCC not locking results in higher engine RPM, which burns more fuel, but also results in elevated transmission fluid temperatures, which can lead to even more issues such as bands burning up etc. Enough of this wear and the TCC valve doesn't seal right - particularly when the fluid is warm - and the converter fails to lock, or locks, then unlocks, and repeats. This allows for a nice, soft engagement of the TCC lock, but it can result in the valve vibrating in the bore and wearing it.
A semi-common issue with the 4L60E is the TCC (Torque Converter Clutch) valve bore gets worn because the TCC valve is PWM (Pulse Width Modulated). Over all, it is a good transmission, but it has a few weak points. I've had a bit of a history with the GM 4L60E transmission and dealing with some of the shortfalls of it. Skip to the bottom if you don't want the back story.
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