4L60E is out and 4L80E about to go in.

[Fast355]

The Express lost its 4L60E this morning and the resealed 4L80E is about to find its way in.

[34blazer]

Cool. Pics?

[1project2many]

80E's live to 300k in our fleet. 60Es are no longer allowed to try. ;)

[RobertISaar]

WIN

does your current PCM/TCM support a 4L80E(specifically that the 60 didn't have an input shaft speed sensor and the 80 does)?

i still don't know how GM did reliable adapt functions without it.

[Fast355]

I have pics, but none loaded on the net yet. I'll try to load them tomorrow. I have the transmission bolted to the engine, but am needing more parts. Need a 2500 or moded crossmember, I thought my stock one was going to work but it didn't work out. I plan to pickup a 2500 driveshaft too, my stock one was too long. After flushing my cooler I was able to tweak one cooler line and it snapped right into place, the other is needing serious modification and I am tempted to add the oem auxiliary on the driverside to keep the 4.3 stalled 80e cool. I swapped the flexplate for a new napa one for a 4L80E and bolted all six converter bolts up. I am also going to pickup an engine oil cooler adapter and bracketry. I installed a 1-ton radiator with the oil cooler in the driverside tank. I am going to have to install a 4L80E specific shift cable as the stock one is about 2" too short. The transmission was a real battle to remove and install laying on my back in the driveway but its bolted in. My 350 block and 4L80E bellhousing was tapped for the 7th bellhousing bolt so I installed it too. I had a whole 98 C2500 pickup harness I got with an L31 I bought years ago and robbed the whole ISS twisted pair and connector complete with pcm pins and the 11-pin trans connecter pigtail. I am in the process of modifying the harness. The PCM is an 0411 and they came factory in a 2001-2002 Express with the L31 and 4L80E. Thinking of emailing HP Tuners for a segment swap if I can find a 2002 L31 4L80E HP Tuners file to rob the trans segment from.

I hope my 4L60E hate humor is acceptable here. 4L80e appears to be in great shape internally and very clean.

[EagleMark]

Won't HPTuner open a .bin? Here it is just in case.

[gregs78cam]

The transmission was a real battle to remove and install laying on my back in the driveway but its bolted in.

At 265lbs (4L80e) I bet it was. I used a 2x12 run from one side to the other and just lifted each side and put blocks under it until it was in place. Best way I could figure to do it in gravel.