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Did you try high lock on the transfer case? Sometimes these have CV axle problems that resemble slipping.

Do a search for "Beckett burner", you will need to retrofit something newer than 55 years old.

Those look AMAZING!!!

Big round thing is power steering remote reservoir. You have V belts so you will have the old design GM pump with integral reservoir.

Wow GP getting sloppy, usually every bit of radio stuff gets stripped out. Power steering on these is a pain, you must follow the TM procedure to get the air out after repairs.

Supplement 7 sez: DTC 73 will set when return amperage varies greater then .16 amps from commanded amperage. ME: The amps sent by the TCM can vary from 0.1 to 1.1 amps. The amps in the return wire are out of spec. You must figure out why. Supplement 7 sez: Diagnostic aids: Check for...

I do believe your new tank is from a M39A2 series truck with multifuel engine, that has the electric lift pump in the huge hole.

So now all codes are gone?

5/16-24 x 1.5"

Wow you be OG in this hobby. Tell us (maybe in your other thread) how you bought this back in the day.

OMG you owned this since 1972????? Wow.

Did you verify the correct number wires are plugging into the correct terminals on the ignition switch? Super easy to mess this up.

Fix it right there. O ring kit on Ebay.

Do the rivets match others on the dash? If not, somebody hot plated your truck.

Doesn't the shelter rack cause the SECM to be not resting on the sponsons? Seems like I see a 1/2" gap?

Ignition switch miswire?

Ignition switch is bad.

Same transmission in both trucks.

I have stacks of M135 main data plates, PM me your serial number and I will see if I have a close match for you.