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I think reverse should be 220 psi and F1 etc should be 140. The fact that you have reverse means the pumps are working. If line pressure drops to nothing when engaging F1, pressure is escaping somewhere in the clutch packs or band servos.

I use Coastal brand moly ep grease.

Ruh ro, I just reread your post and noticed the two asterisks, meaning two additional digits, the early gas truck serial numbers never had that many digits. You will need to find the frame serial number and report back for a revisit.

Your SN sounds correct, see snip from the VIN database. This is from the M35 without winch file. Year model sounds more like 1953.

Enjoy: https://www.steelsoldiers.com/threads/m34-active-duty.206651/

Looking at your pictures, I think you have the trouble-prone second generation PDP with the no-lead solder. Suprman knows a lot about these, I don’t. These boards have been known to have bizarre intermittents like you describe.

Line pressures in N D and R are?

So your scan tool threw a code that the MAP sensor was faulty and not reading correctly with different TPS inputs?

Real good write up here: Scroll down to: So, my 6.5 is smoking like crazy, but I don’t actually WANT it to - Help! Rolling Coal & The 6.5 | Diesel Place

Start by pulling codes.

Sounds like intermittent connections over on the LBCD under the spare tire. 12 and 24 volt battery cables from the disconnect solenoids lead to this box and can be corroded at the ring terminals.

Was the torque converter still full?

Suggest you carefully verify all the connections associated with the transmission power relay. Maybe the controller is powered off with the ignition on and on with the ignition off. Also, the STE/ICE will not help you with this issue, it only provides very basic engine diagnostics such as...

Are you saying the transmission warning light is ON while the ignition is OFF? The transmission controller should be unpowered when the ignition is off. Suggest you still have issues in the relay area.

Need a Chinook to get anything out of there. Thanks for posting this. Lots of treasures there.

Computers have any nomenclature on them? Looks like something from the early 90's with a 286 inside.

Oh that helps. Since GVM is still in business, send them the VIN and they should be able to help you with the original info on the axle. It’s not a military axle. You may need to find a junkyard that specializes in ag equipment. I used to maintain a Terragator fertilizer spreader with a...

Well it's a Rockwell. What is a gvm. Does this have sand color paint on it meaning it was transplanted from a MRAP derivative?

Maybe, but don't forget USMC drives these in salt water every day in training and the trucks come back for more every time.

That is white RTV and seems to been applied by the Army fleet-wide. Idea being protect the connections from corrosion.