I bought my 88 C1500 in 2002 from a guy who managed a transmission shop. He said he rebuilt the tranny and recently put in a shift kit and a GM factory long block 5.7 (made in Mexico). Last year it started overheating so, after removing the heads I found 2 spots where it was bypassing through the head gaskets. Anyway I decided to replace the heads and started reading about how bad TBIs breathe. So, after a 46mm bored TB w/18LB spring, Edelbrock 3704 intake, Summit Racing (Trick Flow) 170cc heads, Lunati cam, headers, high flow cat and 3" exhaust to 3 chamber muffler, and a "performance" chip, I wasn't happy with the results. That's when I started doing research on tuning with TunerPro RT and, with the help from a guy on GearHeads-EFI, started tuning and data logging. All of a sudden my tranny started shiftin @ 5400RPM, even though I changed the weights on the governor to shift @ 5000. Then after a couple more 0-60 runs, it shifts, even at part throttle, at over 5000RPM in gears 1-2 & 2-3! Tranny fluid is bright red and smells good, TV cable is still hooked up and when I pull on it at the TB linkage it springs back in place. I ordered a governor gear, a Trans Go SK700-JR kit mainly for the TV valve and springs, OTC transmission pressure gauge set, Filter, gasket, and fluid. Any ideas or input?