A833 OD 340 4x4?

The 5.9M is a pretty good powerplant for a two-gear application, like zero to 60. It just needs the right stall and gearing to make it come alive. But for the 400Meter-Dash, yur right, the 360 in factory trim,will be a lil lazy.

Consider the crappy gearing with the 3+1 box and say 3.91s, here is the road gear progression; 12.08-6.53-3.91-2.85 Looking at the ratios alone, it looks like this would work decent with up to 31" tall tires. But like crap with 25s. The splits are .54-.60-.73
but consider the A500 with 4.10s
11.23-6.31-4.10-2.83 the splits are; .56-.65-.69
I set them up with the same 2.8 final-drives.
However; the automatic has a Torque Convertor, with a continuously variable hydraulic multiplier that varies between up to about 1.8 to 1.1 or thereabouts.
And the greatest multiplication occurs at zero mph, with the least, at cruising.
Therefore at zero mph, your starter ratio could be 11.23 x 1.8=20.21 depending on the power in your engine at it's stall speed.
Of course, as soon as the truck begins to move this multiplier begins to roll back towards it's minimum ratio. But it will never get there in First gear.
Suppose the multiplier in first gear averages 1.35, then 1.35 x 11.23= 15.16
Suppose the multiplier in Second gear averages 1.25, then 1.25 x 6.31=7.89
Suppose in Third gear, the multiplier averages 1.15, then 1.15 x 4.10=4.72
in overdrive, say the multiplier is 1.08,................ then 1.08 x 2.83=3.06
And in lock-up, no multiplier at all, so........................................... 2.83
Ok then let's look at the big picture,
at WOT;
20.21-15.16-7.89-4.72-3.06-2.83
How many ratios is that?
I count Six.
Ok, 5.5, cuz that 20.21 is a split-second deal.

now, lets put some actual power into those numbers. Suppose your engine, whatever size it is, averages 360 ftlbs from stall to shift-rpm. lets multiply these ratios by that 360 to get an idea of what the axles are seeing;
First the 3+1,
12.08-6.53-3.91-2.85
4590-2481-1486-*** can't go WOT in od.
then the A500
20.21-15.16-7.89-4.72-3.06-2.83
7270-5458-2840-1699-1102-1019

These are ftlbs into the axles.
These numbers now have to be reduced to the equivalent of a one foot radius so we can see how much this will be to the road. So with 32s you would multiply these by 24/32; With 30s by 24/30; and with 28s by 24/28, and so on.
I'll let you do that math, because we don't actually need to know that, because this is a comparative exercise.

Obviously those first gear numbers will blow the tires off, The A500 maybe even all four of them.
I know which combo I would want, and the 3+1 is dead last in any game.
Now you just need a "big" TC, and yur all set.