After the install, the lockup almost feels like shifting into a 5th gear because it is so quick and precise. Before it would do a slow, smooth lockup which was rather soft (and I'm sure that would cause more wear). It also replaces the infamous TCC valve that half the 4L60E transmissions have issues with, which results in the torque converter not staying locked at highway speeds causing decreased mpg and increased transmission temp and wear (my old car had that problem which this kit fixed instantly, my Trailblazer did not but I did it as a preventative measure).įrom all this, I think the most noticeable thing is 1-2 shift is a bit firmer and the TCC lockup is quicker. The Transgo SK-4L60E kit replaces some springs to again stiffen some of the other shift points for less slippage and less wear. The Sonnax pinless accumulators replaced the factory plastic accumulators that can crack (though I didn't have that issue in my previous car with a 4L60E which had 161k miles). Vette servo speeds up 1-2 shift and has more holding power. Bit quicker shifts and more holding power mean less slippage (and therefore less wear) on shifts. The main reason for all the stuff I installed in my trans was to help improve durability and lifespan. I don't really know much about transmissions, so that part I'm not sure about.I noticed a bit faster/firmer shift on mine, noticeable but it doesn't feel that much different. I was also told that if the ring that apply 4th gear is damaged then that requires a tear down. I don't know how that could be repaired other than a different transmission since that's actual housing damage. My biggest fear is that the bore is messed up from the servo rotating. If it comes down to that, I'll swap the transmission myself depending on what they tell me about the servo bore. I've been pricing aftermarket 4l60s which seem to come in much cheaper or highly upgraded for similar money. I told the dealer to call me before any parts were installed with a quote and to tell me what's wrong. There's no way I'm paying 5k for a new trans from GM. I believe the fluid pressure is what jammed it sideways because of my oversight on the retaining ring. I believe I didn't get the outside retaining ring in good, however, because when I was getting ready to pull it back apart (because it wasn't shifting into 4th) one edge of the ring was popped out and the cover was rotated in the same manner as the servo ring. I did install it myself and installation actually went quite smoothly.
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