View Full Version : 4L80 swap

01-24-2012, 08:39 PM
Thinking about moving up to a 4L80 2wd transmission in my 1993 1/2ton 4wd. I know why not just get a 2wd truck. long story better left for a build tread on another forum.

My question is will my 8625 $E6 do the job? Will i need a 1993 4L80 or can i use any pre-LS version? Can you think of any other wiring or programming issues i need to know.

Sorry, If this tread is in the wrong forum, feel free to move.


01-24-2012, 09:42 PM
The 8625 should be fine; the 16168625, 16196395 and 16197427 are pretty much the same; though I have heard of some not having all of the internal parts for a 4L80-E.

$E6 and $0D won't do it without modification. I know one guy over at FSC was using $0D for a 4L80-E. The mod didn't sound very difficult to do.
$0E and $31 will run the 4L80-E and will work in the 8625, without modification. All of your existing calibration can be transfered over, except for the trans part of course.

04-13-2012, 07:21 PM
I believe all the 4l80s are close enough to work except for the later model that had a single connector prndl switch as i know it had a different epc solenoid but I will verify this monday morning