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Park is safer and the trans does not know the difference, any reference to neutral hearkens back to the trucks with no park. run it it forward, reverse then put it in park and check the fluid while idling.

How else are you going to find the leak?

It actually can cause ground loops that can have unintended consequences, every device on a HMMWV has a specific ground return path. IMHO the only reason this ever got off the ground was because to install it you must "disturb" many of the original ground points and some found it "helped" when...

It does appear that the TCM is not turning the MIL light on by what you describe as long as you have confirmed continuity on 567A from the light plug to the TCM, I would say for now as long as the transmission seems to be working correctly go ahead and ignore the missing light and continue to...

So your trans light now works?

That is a typo, there is no such thing as a transfer case check light.

You have already identified you do not have 12V at wire 657B so that is where you need to concentrate your investigation, make sure you have a good ground on your meter when checking voltage on 657B

It is easy enough to see if you have ground on 57T and 599A-B you just need a test light or meter, it ether has ground or not. the trans will not shift if 57T or 599A-B does not have ground.

I do not see a 57C but other than that you are correct, you need to figure out why you do not have 12V on 657B when the ign. is on (DO NOT forget to unplug the glow plug temp sending unit while troubleshooting the trans) 657B is the female (protected) terminal in the plug that connects to the...

That would not have anything to do with the trans light, if the lamp is good then ether the wires have an issue (there should be +12V on one side in the run position) or the TCM is bad. Actually if you do not have a TCM as in retrofitting earlier vehicles with the 100/200A alternator grounding...

Your truck has a 4 speed so there should be a wire from the 14V stud on the regulator to the 12V connection between the batteries, without it the batteries will be unbalanced and die an early death. I doubt very seriously the gen not having a ground wire will start a fire, the gen will ground...

The one on the back of the TC is the rear transfer case seal, usually not a big problem to replace. The one on the rear of the engine could be a rear engine seal as it does not look red, but it could be simply oily water or even diesel from the engine valley. pull the dog house and inspect the...

Can't you push it down from the top after removing the screws? It is a sealed unit so you cannot take it apart. You should have 12V all the time to one side.

All the trucks with the remote PS reservoir have a gear type PS pump, gear pumps make noise, that is why they are not used on civy vehicles.

To completely isolate the batteries it takes two switches, you can leave the one between the batteries and add one to the 12V leads that connect between the batteries

Top priority for anyone with a 4L80E should be a working trans light, it is absolutely essential in troubleshooting and helping to insure you do not fry the transmission.

What code/codes does the TCM report? If you are not already you need to start reading the codes and using the troubleshooting supplement. I would venture to say you are getting a 37 or a 38, brake switch stuck on or off, you are likely not driving it far enough to get a code with the switch...

Unfortunately the rattles, squeaks and leaks warranty has expired.

VEE: noun /the sputtering sound of an early German WWII rocket.

Look closely at the other side that is complete, it should be mounted more or less the same way only one side has shorter lines. Did you acquire the correct lines or still trying to jury rig something? Here is another shot of the brake lines, it is kinda backwards as #9 is the left side line and...