Heres my cents, if you want to drive it anywhere anytime you want that converter to lock (no longer stall) at cruising speed with 4:11 rear gear and your probably running tire dia. around 27" at 65 mph your rpm's will be 3,324.I don't know about you but that seem a little high,not to mention expensive on the gas mpg. because a 3500rpm stall will constantly be slipping a little,which also creates heat and you will need a trans. cooler to keep things from smoking.Here is the math formula for gear ratio to rpm (mph x gear ratio x 336 divided by tire dia.)if you have a overdrive trans. 30% is the standard so the math would be (mph x gear ratio x .70 x 336 divided by tire dia.)