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I install a GPS speedo in my HMMWVs, never heard of a GPS tach. The cure for the error with the 400A alt is to replace the alt with a 200A or the the pulley on the 400A alt, that 400A is a beast and causes other issues with shorted harnesses and failed mounting bolts.

You are looking at around 4-5 grand without the custom machine work or install labor :)

I did, it is a much better transmission that the 4L80 as far as efficiency goes and is just a strong (hence the 80 rating) It is allot of work and some of it is custom so not something you can get done "down the road" (or anywhere for that matter, you have to do the custom work yourself) Here is...

I would think pretty close to 7/8"

If it has the 400A alt it likely has an overdrive pulley so the RPM will show higher than it actually is, the turbo also has the highest ratio diffs at 3.07:1 so they do rev higher than the A2 trucks with the 4L80

It is 5/8" ID hose

That is what most folks do.

I do not think the TCM stores codes, so the TOSS may have cleared when it was reconnected, the supplement should describe what clears the codes (besides disconnecting the batteries) It does seem to point to a TCM issue. IIRC some codes would clear when the vehicle was shut off and re-started if...

Welcome to the SS forums!

I have one meter that flashes a warning light if you select a measurement type that is not compatible with the way the leads are plugged in, I thought that was pretty cool :)

Welcome to the SS forums! The geared drives have straight cut gears and do make a certain amount of noise. This is much more pronounced in vehicles with hard tops like the helmet top etc. Is this your first Humvee?

That is definitely pump noise, be careful when you push hard on the brake pedal as you can blow out the seals in the hydraboost if they are a little weak. Also it is not a good idea to go all the way to lock on the steering while running as it causes a spike in the pump pressure. Do the...

It could be the Cadillac valve, unplug it and see if the sound changes.

Well you can start by disconnecting things until you confirm the problem device. If the TCM power relay was stuck you should have a trans light on all the time. Start by disconnecting the batteries, then unplug the TCM harness at the TCM and then reconnect the batteries and test again.

yes

I was speaking in general terms, most folks have a dual voltage 200A system, I would NOT install a 12V winch on one of those vehicles and certainly not on a 60A single voltage system. The cost of a replacement regulator would pay the difference in cost of a 24V winch over a 12V, several times.

I would not run a 12V winch, that would load the regulator well beyond its ratings.

I would say if they are the correct type (uses two tabs) and it happens to line up with unused tabs, then I would reuse them, I would look very close to the used tabs and if I thought they were week I would go ahead and break them off so they would not "fall" off into the bearings. Of course I...

Now just like lug nuts I replace all the half shaft bolts and Nord lock washers on every Humvee I get, it is a good idea to inspect the flange threads as who knows what they have been through.

The STE/ICE bypasses everything, if that does not work, of course check to make sure you have 24V on M and that S has continuity to the solenoid start terminal (wire 74) If that checks out then you only have the heavy wiring from the batteries to the starter, the ground is just as important as...