You have two areas you need to watch, tire to spring clearance and clearance between the tires.

With monster tires, you also have to watch front tires at the springs, bumper and rear of the wheel well opening when turned full to the left and right.

Those spacers can get expensive if you need them against the brake drum and between the tires.

There are enough tire dealers and tire warehouses within 10 miles of me, I can have about any size I want tomorrow, 75 or 85 profile.

I am in mud so much, I run 285/75-16 mud tires year round now.

 

Dave, I'm pretty suprised the huge loads of gravel you haul, you don't run duals

 

I would have to swap axles to run duals, which would be nice when I am hauling or towing.

But duals are a pain when plowing snow or running in the mud.

I am hauling less frequently than I used to, so instead of haning to deal with the duals in the mud which lately I have been spending a lot more time in, I just drive slower when I haul stuff.

A load on a quality tire usually is not much of an issue untill one of two things happen.
Either you are driving non stop for long distances or you are driving at high speeds.
Worst of all is driving fast for a long distance which overheats the tires even faster.

Heat is the biggest issue when hauling loads.

 

Yeah Dave, when I haul heavy loads on any of my trucks, I stop and take a pee break every 30-45 miles, to let the tranny and tires to cool down.

 

You can use this method, and use no math that we all hate. This works better though with someone working or looking at the stopwatch/watch.

Do the above, and start and stop the watch at the milemarkers while driving 60mph. It should take exactly one minute to go between the markers that are a mile apart. If it takes less than 60 seconds, then slow down a little bit and try again. If it takes more than 60 seconds speed up a little bit. After a few speed adjustments, you should be able to travel from marker to marker in 60 seconds. You are going exactly 60mph. If your speedo says something different, then that's your speedo error.

No math at all, and no gps required.

 

I am new here so help me out. I have a 1990 F-350 cab and chassis (old U-Haul 14ft box) 7.3L w/C6 and 4.10s. I want to change to a E4OD. I have a electronic controller located. What kind of other problem envolved? Shift linkage? Drive live? bell housing? Flex plate? other linkage hook up? Anyone out there did this?
Thanks, Charlie92154