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Take the batteries and have them load tested, nothing you have done gives me any confidence you have good batteries, most "jump boxes" are designed to help a vehicle with low batteries not missing batteries so not performing well on the jump box is no surprise, Nobody on this forum is going to...

Although it does appear you have a bad TCM as the TCC circuit is complete and tests good.

If you have enough patience I can send you one to test. You pay both ways.

I think one of the numbers is 88999230

There is nothing serviceable on that TCM. You can replace that one with the older style that requires a plug in EPROM, the EPROM can be bought at Eastern, it is the cheapest way to go as the rebuilt TCMs are around $200 https://www.easternsurplus.net/Products/SearchResults Fortunately you have a...

Go ahead and add you new info here, even though this thread was somewhat hijacked by the tbird

I replaced the high idle control with a modified throttle control off of a 5KW gen set, worked pretty well. I was surprised at how well it maintained speed given it was just a throttle control, of course you have to remember to release it when you want to slow down. If he had a Dmax or a LT gas...

How about a picture down the side to show how far the tires stick out of the body, any part numbers on the rims?

While you are in there look for signs of water intrusion.

First you should never knowingly drive without TC lock, the torque converter makes a tremendous amount of heat when it is driven out of lock. Second do you have a working trans light and if you do when was the last time you read the codes?

I set up and measured just over 1A (1.1 actually) from X to ground.

That is the cold start advance, you should be able to carefully squeeze that barrel connector in the wire fitting to get it tighter, if not you may need to replace the male connector. (Would be female in ANY other world than the military) Also you are missing the boot on the IP for that wire...

It is extremely easy to forget to move the lead back to "volts" so the next time you go to check volts the fuse pops, been there done that several times..

You connect one lead of your meter to pin X, the other lead to ground. Meters require you to plug one lead into a different place on the meter to read amps and of course a different meter switch position, you may need to read the instructions for your meter.

This was very confusing to me as I have changed a ton of hoses on HMMWVs and have never put a 3/8 hose on a 5/16 hard line. I have a M1097R1 4 speed truck on my lift and measured the hard lines to the transmission. I have no idea where your lines came from but the hard lines on that truck (and...

The fuel filter should have been one of the very first things changed before parading around the neighborhood showing off your new toy!! Lose of power and smoke can also be a clogged or partially clogged CAT or intake filter

If you do see around 1A then the circuit is OK, ether the harness/connector (pin X to B5) inside the TCM box are bad or the TCM has a problem.

If you are seeing 12V at pin X at the TCM connector then the circuit is complete. What I would do to confirm is use my meter on the 10A scale and short pin X to ground simulating TCC lockup and measure the current. I would expect to see about 1A, this is a modulated (PWM) solenoid so take the...

I have never seen a GM truck transmission that ran 5/16 hose, 3/8 and larger but not 5/16, I think the TM is correct just possibly a piss poor design.

Welcome to the SS forums!!! There are a couple different ways to sneak in there and get the belt on off, I am sure you will get some helpful responses soon!!!