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Looking at both 4l80's, 1993 & 2000, both have the exact shaft and bracket.... Also, can I just change the computer to a 94/2000 model ?

Greetings again. As I posted recently, my 93 4l80 is having problems. I have a chance to purchase a 2000 4l80 that was recently rebuilt for $400. I read here by Thefermanator that the 91-93 has a cleaning cycle for the pressure solenoid. The 2000 won't have that. What will I have to do to use...

I replaced both speed sensors and the TSP with AC Delco units. I'll check for grounds and Temp Sensor next. Also, there is a Green Wire in the Trans wire harness at the Trans plug in the was severely pinched in the plastic. Any idea what this wire controls ?

Watch the rpm and by feel, it shift 3 times. Shifting out of overdrive to just drive changes nothing except engine brake comes back.

I count the gear changes, starting in 1st, then 2nd, 3rd then 4th. Then the down shift to 3rd and the rpm goes up to what 3rd was.So, I'm assuming it is a downshift to 3rd. But, also I can shift the lever down to just regular drive and get engine brake.

Greetings, this is my first post. 1993 Chevy Silverado 3500 Dually 454 4l80. Bought truck with rebuilt 454 with 100 miles. Seller says needs rebuilt trans... Trans shifts firm when I first leave and shifts thru all gears. After a mile or so it down shifts to 3rd and will not shift back to 4th...