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Overall, but it could be that one particular item has become sloppy and is causing the clunk... I would also look at axle bushing runout adjacent to the axle u-joints at the spindles and ends of the axle housing. slop here could cause the axle to start smacking its housings, but it would...

How is your overall backlash in the front? With the center diff locked out in mode, it is unable to compensate for the different arc/circles traveled by the wheels front to rear. With a locker in the rear it may be loading/unloading the driveshaft as it is dealing with different arc/turn...

I'd look for a crate C7, and have a plan for that installation. But continue to run the 3126 until it quits without doing any major updates beyond possibly the oil pump and basic maintenance...

Saw a M1088 that a local agency had acquired that had 89PSI stenciled above every wheel-well...

Yep, these things are pretty nose heavy when empty. you need to run different tire pressures with different axle weights to balance out the tire wear. 55PSI is considered an Offroad/Cross-country tire pressure in the Goodyear MVT documentation…

Mmmm high idle… Hey wait, i have a cruise control hand lever:)

Ears OK, unless you are looking for a specific number, like say when using a PTO, or determining TC stall…

Yep, its right there on PX26 pin 1 and 4. Pin 4 is referenced to ground(tb2) at the truck side of that plug.

I am not putting mine back in:) there is another small module down there, called a “frequency divider” that you can also pull. Small box with about 5 colored leads into a multi pin connector. Its actually an isolation amplifier that allows the magnetic pickup RPM sensor to feed more than one...

Yea thats just the emissions compliance sticker. There should be a smaller sticker below that(front left corner of the valve cover) that has the serial number. It appears to be missing on yours and would be under the shadow of the hand holding the cellphone in the first pic… Mine has that same...

Oh, does the shimmy change if you apply the brakes?

What is the frequency of the shimmy? Big tires turn relatively slowly, about 6 revolutions per second(HZ) at highway speed. I would expect a tire to oscillate about 3HZ at 30MPH... A DS would be 7.8X that... My limit for counting reliably is about 12HZ, so even at 30MPH a DS would be too fast...

I have looked into National. You are correct, national does make hundreds of variations, unfortunately one WITHOUT several inches of suspension under it, is not one of them, No room for that in a LMTV cab, so you are right again, nothing to see here, move along…

Yea that might fit if you strip all the air suspension below the positioner slides off of it:)

A pico scope is a multi-channel analog to digital converter box that connects to a serial port on a laptop. A piece of software accesses the data coming in from the converter. Basically creates an oscilloscope out of a laptop. the only pulsed signals on the A0 STE connector are the flywheel...

The AO STE is very rudimentary. Basically you can read: 24v, gnd and regulator field duty cycle(how hard it is working) from the alt A buffered/isolated flywheel tach signal(133 pulses per rev) from the frequency divider. A 24V battery voltage sample from the PPD A current sample seen by the...

lose traction...

So CTIS cycles and the tires start to deflate? If so, look for an obstruction in the PCU vent line. This line runs from the plastic cover on the bottom of the PCU to a port in the floor. You can disconnect the line at the plastic cover to take that line and floor port out of the equation...

Yes, you simply need a millivolt meter that can read 3 digits right of the decimal(.001). Connect it to the two small screw terminals on the shunt to measure the voltage/potential developed between those terminals anytime current flows thru the large attached cables. Rated to 1000A As wired...

Thankful for the lockers because you can still spin tires?