Just to give you an idea on the realistic use of a HT740 with a 4 stroke engine, I believe you can get a 3.08 rear ratio drive for the axle. If you have 11R-24.5's (478rpm), you'll have a 65 mph rpm of 1595; 70mph @ 1717rpm and 75mph @ 1840rpm, which is not to high considering all big gensets run at 1,800rpm. If you have an engine that is putting out 1,450lb/ft of torque, based on a weight of 45,000lb, then your startability will be- 32%! At Freghtliner, we want the turnpike startability to be 14%, on road 16%, on/off road 20%, and off road to be 25%. So you'll be fine

For some of you that want to play around with startability, here's the formula. First, take what you think is the heaviest your bus will ever be in pounds and multiply that figure by 10.7 and put that figure into memory. Then take the starting torque of the engine (with automatics it is pretty much full rated torque since the torque converter can pump up to 12-1400rpm on starting), multiply by first gear, multiply by torque converter ratio, multiply by rear end ratio, multiplty by tire rpm and divide by the figure in memory and that's your maximum startability in percent of grade. So in this case it'll look like this:

1450 X 3.692 X 2.0 (torque converter) X 3.08 X 478 Diivide by 481,500 = 32.74%. Good Luck,TomC