6L80E

[Butter]

Make

Chevrolet

Model

Silverado 1500

Year

2013

Miles

150000

Engine

5.3

The 6L80E transmission in my 2013 Silverado 1500 recently overheated and started slipping. While rebuilding the transmission I found the plastic alignment plate had melted in the oil pump. I replaced all the clutches and seals, the oil pump, bell housing and reinstalled the transmission back in the pickup. When I took the pickup out for a test drive it would shift 1st and reverse normally but when I would accelerate to where it should shift into 2nd it acts like it's slipping and then all of a sudden grabs and almost stops the vehicle and goes back in the first gear. I believe it's locking into limp mode. I hauled the pick up to the dealer and have them reprogram the transmission but that did not fix the problem. It's not throwing any codes so I'm not sure where to look next. I'm wondering if the TCC/shift control solenoid got too hot and is no longer shifting.

 

[paulo57509]

When you were tearing down the transmission, where (visually) was the evidence of the slipping?

 

[bp042665]

these things are bad about valve body problems and tcm issue's

 

[Butter]

When you were tearing down the transmission, where (visually) was the evidence of the slipping?

The only thing I found was in the oil pump, the plastic guide inside the oil pump had melted so the transmission was not getting the proper fluid when it warmed up. The bellhousing and the oil pump cover plate also had .005 to .006 wear on them.

 

[Butter]

The only thing I found was in the oil pump, the plastic guide inside the oil pump had melted so the transmission was not getting the proper fluid when it warmed up. The bellhousing and the oil pump cover plate also had .005 to .006 wear on them.

When I put the truck on jack stands and put it in gear the rear tires will turn in 1, 3, 4, 5 and 6 gears at idle but lock up in 2nd gear.

 

[grcauto]

I vote VB issues since it's been flashed with correct software.

 

[Butter]

UPDATE: I haven't done anything new to the transmission other than let it sit while I discussed different options, but when I went to move the pickup it drove forward 50 ft and locked up. I can back up but it will not drive forward. The only thing different is the outside temperature has cooled off since I test drove it 2 weeks ago.

 

[Butter]

FYI, thanks to those of you that responded. I went back in and found I had put the sprag in backwards. Transmission works great now.