Today I was able to get hold of right person to answer question concerning the Torque Rating on my 2001 4000MH Allison Trany, Answer is max 1650 ft lb input, so with the ISM 500 @ 1550 ft lb, not a large worry as long as I act sensible with it.<br/>Just for those interested in such items <br/>Cheers
Topic: Allison 4000MH