Thread: 4T65E Hard Shift-Solution

Just hit 130,000 miles on the 4T65E with the Transgo shift install and the (2) 18,000 GVW Long Double stack trans coolers doing all the cooling outside of the radiator-almost 40,000 miles with zero harsh shift. No issues! Just an update!

Figured I'd update too.

The shift kit completely silenced my pump whine/hard shift/P1811 issues. I never solved the issue with TCC lock-up but Lucas Trans "fix" helped it considerably. Even so, I always hated driving the thing. I don't recall if I mentioned it when first reported, but I would never put any "transmission fix" additive into a vehicle that I cared about and wanted to keep on road. None of them will "fix" anything. So just advice, I guess. I don't advocate using these things and only tried it myself b/c there was no way that I was going to spend any big $$ on this POS van ('00 Olds Silhouette).

In any case, oddly enough, I kept the transmission limping along pretty well but my van went to the scrap yard with a blown head gasket at about 170K. I was never so glad to see a vehicle go. It was the biggest piece of crap I've ever owned.

In any case, if you have a GM vehicle with a 4t65e in it - just do the shift kit & cooler even if you don't have any problems. Whatever the root cause of the slipping that leads to the P1811 code, it is really bad for the clutch packs. I am convinced that the shift kit will prolong the life of the trans.