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For some reason I thought the 91's had a wider frame.

The set of 3.42 from the 91 suburban, they won't fit will they? They are SF? Do you know if the FF from 73-80 3/4 ton will fit? and are there any with 3:08 if they do fit?

I believe the 88 and up models won't fit the m1009, but possibly if you had a sf rear from before 1988 you could swap out the gears from one of those 3:08 1988 and up axles, hopefully someone has the answer. I do know the 16" wheels have the wrong backspacing for the 10 bolt m1009 so don't buy...

If it does I have never heard of one. It would be an ideal replacement. Probably the best place to look would be a 2wd 1/2 ton suburban, but I bet it would have a 10 bolt. In any event it would be rare. Grab the 16" wheels too if it has them, they are hard to find too.

Unless you want to go with a lift kit/trimming fenders and big tires 4:10 ratio will slow you down, actually anything above the 3:08 will cause a decrease in top speed. That is the dilemma I have too. I want stronger axles for towing, but I want to cruise at 70 without overreving the engine...

Use this calculator to help figure out the gear ratio, tire size and speed you want out of your M1009 Gear Ratio Calculator

I forgot to add shock mount location will be different too on the 1 ton CUCV. You can find 14 bolt ff from 3/4 ton pickups that will bolt in a m1009, but suburban 3/4 ton axles are everywhere cheap. Take your tape measure, get the measurements for yourself, don't buy 1st, measure later and rely...

Anything in a suburban will bolt in to a blazer but for 1 ton axles you will have to move the spring perches. Springs are a different width also.

If you can't find a FF 14 bolt and matching front reasonable, a SF 14 bolt and matching front are cheap, give you 8 lugs and you have a much stronger rear(same front). Not as strong as a FF but will easily handle situations where the 10 bolt is marginal. They are easy to find in 3/4 ton...

I have backed heavy trailers around in 4 low 2wd, but thought I should be careful with the throttle because 4 low can put some serious strain on a rear that isn't known for its strength. Obvious your axle couldn't take it, maybe it was weak in which case it's better to break at home than out in...

When the truck starts bouncing, 10 bolts have a very short life span. I haven't heard of any breaking on the highway with the HP a 6.2 makes. Were you in low range 2wd when it broke?