Will our IDI´s handel rockwells 2 1/2 tons and 48´s just a thought been surfin around http://www.chuckstrucks.net/home.html and WOW this stuff is cool
but I´d like to keep my IDI Hmmmmm

 

The engine will have no prob turning them since they have a low 5.something:1 ratio. I've seen crawlers with 4 cylinder imports turning rocks no problem. The problem is fitting them under your rig! good luck.

 

Rocks have 6.72 gears... You'll be able to turn the tires pretty easily, but, depending on the tires, and if you want to crawl, or make them work in mud. Most mud tires, to work properly, require one thing, wheel speed, and lots of it. With 48's, you may not have enough rpm available in the tallest gear that allows you to easily get the tires turning.
With 35's, 3.55's, and a T19, running 2nd and 3rd high range, I was spinning my 460 in the 6K range to be competitive racing....

 

6.72 gears with 48" tires if you shifted at 3300 in every gear the high range shift speeds would be,
1 - 2 shift at 17 MPH
2 - 3 shift at 29 MPH
3 - 4 shift at 37 MPH
and topped out in fourth at 70 MPH.

Just a little slower that 4.10 gears on 235/85-16 tires.

 

Be warned in advance these are some unbelievably heavy axles. I bought a pair years ago for a project that never got started. Any time I move them I have to use the cherry picker just to lift them up and that is after I yanked the drums and backing plates. I think they are in the realm of 1100 lbs each without brakes at the wheels. Unsprung weight is a very nasty thing to deal with. If my memory serves me even on a light steel rim 48s weigh almost 200 pounds each. Road manners would also go right out the window. I suggest contacting Boyce Equipment as they are the gurus of the Rockwell conversion
http://www.boyceequipment.com/

 

Those guys put out alot more horese power than we have I think minus turbo we´ve got 170 bhp at least 300 bhp would be great
Gotta get to my truck first its far away at the moment. (I am here in Germany not military)