Quote:
Originally Posted by allan5oh
Yes that will be overdrive.
You would need to put a direct drive in there AND change the gearset.
If you didn't you'd be at 2100 rpms at 60 mph :P, or 1931 at 55 mph.
You have a 11.1L detroit correct? What are you getting for fuel mileage currently?
Do you find the revs are too high? 1450 sounds good at 55 for that engine.
2.93's would put you at 1380 at 55 mph (with direct drive swap as well)
3.08's would put you at 1451 at 55 mph (again with direct drive)
I'm getting 7.2 (last I checked 2 months ago) loaded, and 10.7(also two months ago) empty. It seems to be doing even better now with the new tranny/tires,..I'll check it next week when I head out.I wanted to change the drive train when I got the new tranny, but it seemed too complicated for the shop to do. My cruise control stopped working 50 miles after I left their place the last time.
I don't think there are any issues with my diff's even though they have 980,000miles on them. They came with synthetic gear oil and don't leak, so I'm probably better off keeping the truck with stock spec's.
I have the 11.1 and 1450 is the lowest I can run this engine,..it falls flat if I drop below that rpm. Its running a bit hot, but I think thats because the engine can't breath through the single muffler, I put on duals and it seems to like the less restricted exhaust. I might also get a fairing for the roof, to help the air up over the sleeper. There's a 17" high wall for the air to hit above my cab.
I toyed with going with a taller 22.5, but still decided to stay with the trucks stock spec's.