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4L80e Upgrade Here is my 4L80e experience Started with a 1988 24,000-mile M998 that had been updated with the 6.5L NA, still had the TH400 and NP218. The TH400 became a 4L80 and the NP218 was replaced NP241c, to allow the 2wd operation. Time will tell how the 2wd works, but lots of modern HD...

I am in the middle of doing my 4L80e Conversion and will do a write up on that part of the project, but I was unable to find anything on modify the stock shifter. Here is my adventure... Modification of 3 Speed Shifter: One of my initial concerns with the 4-speed conversion was the shifter...

I am looking for printable copy of the M939A2 wiring schematics. I have the PDF of section H in the -24 TM as well as the P2P, but when you are out on the truck hunting for wires/ issues, these aren't much of a help. Anyone with a M939 should have the P2P, it is fantastic for understanding the...

When I got the truck from the government, someone along the way was kind enough to to break the top barbs off of the washer bottle. My neighbor had a take off whole bottle assembly, problem solved, nope... As I was pushing the hoses on the barbs, I broke one! The white plastic is brittle. It...

Hi all- While I set up an account several months ago, I have been in "reading" mode prior to purchase my first truck. Could not imagine I ever would have bought one without being able to read the TM's or wealth of info that is on this site. I ended up with a '90 M931A2 from GP that I plan...