Buy an SCT tuner and get free custom tunes from BAMA for life. Included in their tunes is a complete remapping of all shift points and increased shift firmness for the 4R70W. Their tunes absolutely transformed my 4R70W. I don't see any other aftermarket shift kit could be any better.
.....plus you get a tuner with free tunes for life. After the price of a shift kit and the cost of having it installed, you won't be that much lower than the price of a tuner.
Food for thought.
Buy an SCT tuner and get free custom tunes from BAMA for life. Included in their tunes is a complete remapping of all shift points and increased shift firmness for the 4R70W. Their tunes absolutely transformed my 4R70W. I don't see any other aftermarket shift kit could be any better.
.....plus you get a tuner with free tunes for life. After the price of a shift kit and the cost of having it installed, you won't be that much lower than the price of a tuner.
Food for thought.
I traded it for a built T56, but the owner has no complaints and I think it gets beat up at the track.
The J mod seems the way ahead though. Just a case of the separator gaskets being drilled. Not as simple as it sounds though.