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...Oh, one other thing: These shafts are heavy, it is very helpful--almost essential--to have a second person to help when separating and assembling the slip-joint.

Drive shaft removal/reinstall and/or U-joint replacement is actually pretty easy on these trucks. Only one that I have done was stuck good, and it didn't take too much persuasion. Most tap right out. I always clean off EVERY SPEC of old grease everywhere, and repack full of new. Advise: -...

I know this is obvious, but it got me one day moving one of my trucks around the yard--if the transmission fill cap is not tightly installed, the truck will drive like it is stuck in high gear. It will shift, but the tranny can't build pressure, and all of your power will literally go right out...

Overdrive, Thanks. Nice write up. Now I don't have to do one. I did basically the same process; except I removed the drive shaft. One thing you did that I did not, was put the xmsn in learn mode when I was done. Where did you find the procedure for this? Thanks again, Walt

radbad, Thank you for your post! I have solved this problem, and have been planning a write up to post here, but have not yet been able to make the time to do it yet. some of your finding are indeed correct--and your idea that my problem was due to overfill was exactly correct! My truck...

That's what I am afraid of. However, there were no metal in the oil at all, was actually very clean...

Yes. I've been talking with my local Allison Service Agent about getting it in for them to look at. So he is prepared for what I am bringing him, I emailed him one of the threads on here where yourself and Tennmogger were discussing connecting the diagnostic equipment to these trucks...

...I checked the trouble codes last night, am getting three codes related to faulty temp sensors...

I'm just having a really hard time accepting that switching from motor oil to Dex-III has caused the problem. From what I understand, Dex-III is SAE-10 motor oil with many additives to make it better suited for transmission and other hydraulic applications. I didn't mention it earlier, because...

Awesome. Thank you MaiNiaK!

76 Super ATF: http://petroleumservicecompany.com/76-super-atf.html

Ya, thanks. The manual just gives a big list of fault codes, but how do I get it to give me a fault code???

Anybody have any experience with this issue: I drained the transmission on my LMTV of the motor oil the Army was using, filled with Dex-III and went on a spin to flush the fluid thru the system. Then I planned to drained again, change filters and refill with Dex-III. (I have not yet done the...