Thread: Progress on the bus . . .

Tweet

John,
To clarify, the table you see on GearVendors is for one of their units hooked behind a NV4500. Before you go too far you need to be dead sure what tranny you've got or you may be a sad pup when it's all done.

The GV unit is going to almost split the difference you have now between 3rd & 4th, with a ratio around 1.30 to one. In the table I sent you by e-mail that will add shift point MPH values of 49, 59, 69, 78, 98 and 118 for each of the RPM values on the left for a new 3OD-4 shift point, so at 2500rpm you'd be at 37 in 3rd, 49 in the new 3OD, and 64 in 4th. Given your legal limit, you'd run through the gears up through your new 3OD, then as you shift into 4th you'd only accelerate to about 2200rpm and be at 55MPH, then drop down to 5th to maintain speed and drop your rpm's to just below 1600. You're still operating fairly low in your power band, but you seem to be OK with that. At 55mph you're at 1575 in 5th, 1675 in new 4OD, 2200 in 4th, 2800 in 3OD, 3650 in 3rd, but almost 6000 in the new 2OD. That says you can cruise easily in 3rd up to 5th. I'd say that's a lot of options, but I'd venture a guess that you won't use your new 5thOD (double OverDrive) much, as you'll be down at 1250rpm at 55mph.

BTW, your new 2OD to 3 shift point MPH will be 18, 27, 32, 37, 46 and 55 at the rpm's in the table, which helps split the wide gap there now.