blt2ski wrote:
3/4 tons have full floating axles?!?!? False! I have yet to own one with a full floater. A sw one ton yes. Not a gm 2500 any how.
The most recent might.....
Also, the 1500s I'm looking at, the overall low gearing, needed to pull a grade, is better than y 2500 with 4.10 axle gears. One needs to also look at trans gears, and tire Diam.
Everything else being equal, a rig with 3.42 gears and 28" diameter tires, will have same shift points etc as a rig with 3.73 gears and 30" tires, as a rig with 4.10 gears, and 32" tires.
A 3.42 geared rig with a Muncie 4 sp, has same pulling power, both low and high, as a rig with an NV 4500 and 4.10 gears. I'll take the latter, as I have 5 gears, club poo Ser shift points, vs the 4 sp combo.
Many way options, choose what is best for you.
Marty
All GM 2500HD trucks have full floating rear axles now. The gasoline powered ones have a 10.5" and the diesel models an 11.5" (some have an 11.8" ring gear, but I believe it's the same housing). Ram uses essentially the same rear axle. The 9.5" semi floating rear axle was discontinued years ago as far as I can tell.
There are no pickup trucks on the market with 28" tall tires so your discussion of tire height is moot. All GM trucks on the market today have tires of approximately 32.5" height. The 265mm width seems common. Aspect ratio is determined by the choice between 17, 18, and 20" wheels to keep the overall height consistent. This makes it easy to compare gear ratios since the tires are all approximately the same height.
No new trucks are available with "Muncie 4 speeds" nor NV4500s (nor any manual transmission of any kind), so that also adds nothing to the discussion. The transmissions available in the current generation of GM trucks have different numbers of gears (6 vs. 8) but their highest gear ratios are similar, and so an apples to apples comparison of the axle ratio is possible. In the next few years, I suspect we will see 8 and 10 speed automatics available in all levels of the trucks and they'll be even more similar.
1/2 ton trucks make fine, occasional tow vehicles, but they do not have the same features that make 3/4 and 1 ton trucks effortless tow vehicles. Of course everything is a trade off, but the peace of mind is priceless for me.