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Like 98G is saying, the error is a percentage so the higher your speed, the higher the error. I also converted from 11.00s to 16.00s on my M813 so i made this quick crossover reference as a short term fix till I get the speedo gear updated. Check out this thread for info on updating the...

I made a chart based on math and then drove by the sheriff's radar trailer and the speed readout matched what the math said.

A 2" drop in less then 10 miles is way excessive. With the overdrive effect of the 53s, the cruising mileage should be about 8-10 mpg according to others who have swapped to 53s. If the speedo cable gear box on the transfer case is still the factory ratio for 11.00-20s then you're actually...

The only one I've seen was an M818 show truck called "Double-Duece" that had bagged suspension and only on the rear

This. We need more of this. Thanks for replying back with your findings! More often, we never here what the cause was or what the cure was.

Someone has to be first to do it. Document it well and do a full write-up with lots of pics!

The closest thing I can remember would be @HanksDeuce that runs a 5.9 but is in the 2.5 ton section and online.

How well do the windows mate up with it?

How about a T3 liquid transporter from 1960? Top speed of 25 mph. Made for diesel. A deuce & a half couldn't really haul the extra weight but could certainly tow it and a max of two of these could be towed together. This may be an experimental version that i got to check out at a...

You bet and remember that approach because it can work on a lot of other parts

Here's how you find the answer: Download both halves of the M809 Technical Manual for parts that covers your M813A1 (TM 9-2320-260-24P-1 & -2) The index of the first half will direct you to the rear brakes & hubs section with an exploded view of the parts and a Bill Of Material. Copy the NSN...

For the lug nuts or for the studs that hold the two wheel halves together?

Big Mike's Motor pool?

Keeping it in gear while slowing is much safer in these trucks because you're giving yourself redundant braking capabilities (compression braking + parasitic drive train drag) which can help get you out of trouble if the hydraulic service brakes fail. If freewheeling then you're relying on...

I'm pretty sure 2,3,4, & 5 are synchro'd

The advantage might be avoiding the fatigue on your left leg and the wear & tear on the clutch parts? Or maybe there's no advantage and it simply moves the wear & tear from the clutch to the synchros instead...

Do you happen to know what year your truck was built? Mine's an '81 and it shows that at some point they revised the grill guard design to incorporate the straight flat bar:

Not sure if I've asked this before but... I'm curious if these Spicers can handle it or put up with it. I've never tried it myself - just always used the clutch to shift like a pickup truck. How does everyone row the gears?

Mine moves a lot easier when I bump the clutch out to let it drive forward just a bit as I pull up on the lever

I hope that picture makes it to the calendar!