Can I improve the transmission to make shifts “tighter” and shift with more performance oriented up/down shifts?
Since the PCM has a lot of control over the transmission feel and shift points, most of the performance PCM programs reprogram the transmission for a better shifts. Changes include harder shifts, increased rev limits, delayed upshifts, and quicker downshifts. Another member has suggested using Type F transmission fluid instead of the Dexron stuff. Dexron is formulated with more “slip” agents in it, resulting in sloppier shifts. This comes from its origins in the land yachts of the seventies. Also, Scott Mueller posted the following data on a couple of shift kits that are available for the 4L60E in the Impala (and many other GM vehicles): I have purchased both the TransGo (818-443-4953) and Art Carr (714-962-6655) shift kits for the 4L60E. I must say I was blown away by the TransGo kit, it is extremely comprehensive and well thought out. The Art Carr kit is very simple by comparison. The Art Carr kit (#17050) for the 4L60E costs $59.00 wholesale. It includes nothing more than a 3-4 accu
