[Big Dave]

Couple of thoughts about comptiger's Jeep Grand Cherokee.

1. I don't think T-56 trannies can be fitted to a transfer case.

2. You don't want to slow the engine down by using larger diameter wheels/tires. That decreases MPG because it increases rotational moment of inertia of the wheels/tires. RMI goes up with the square of radius. They become bigger flywheels and you have to pour energy into them to accelerate or decelerate. Pickup truck guys find this out often to their sorrow. I've tried both ways - bigger and smaller and found this is something the factory boys get right.

3. A GV costs more than a T-56 but it indestructible. I looked into a T-56 but the vast torque of my diesel and the road load a pickup can develop (heavy load going uphill or pulling a traler for hours on end) would trash a T-56. Yes, I know T-56s are used in Corvettes and Vipers, but these arelight cars with powerful engines. They don't really put that much toque through the transmission. The GV was developed for a British Bedford deuce-and-a-half military truck.

4. Because it is so aerodynamically hopeless, your Jeep would be a great project just to show what you can do with gears.

5. Randy's Ring & Pinion sell Yukon R&P set for the Dana 44 down to 3.08:1.

What I'd recommend: Stay with stock diameter tires and go skinnier. "Pizza cutters" are generally fine snow tires. Then swap in 3.08s in the axles. Either that or stay with the 3.73s and put in a GV. That would yield you 2.98:1 gearing. That would cost you about $700 more than regearing two axles but you can cut it out when you like.