4l80e tran
I have a 1997 4L80E in my 1992 3500.
If your '91 has the original wiring harness on the truck you will need to change it.
The cooler lines will need to be adapted.
My trans had a brake on the tail housing, I just tok it off and put the original tail housing and yoke on it.
Been in there for 13 years at least.
Last edited by jertho; Jun 26, 2019 at 11:52 AM.





