inline transmission overdrive

[detroitdiesel64]

i was wondering if anyone has ever tried to us an inline overdrive on a Superstroke? so if theres a company taht makes them? i was kinda interested in them since i found out diesel is raised from 4.14 to 4.60 in 2 hours.... im gona have to start buying the family size of vasoline now... lol

[Marty]

gear vendors overdrive/underdrive unit.

Pricey around 3,000 bucks + a shorter driveshaft... BUT I'd venture to say that with a 20% increase in efficency on the hwy you'll recoupe that quickly depending upon how much you drive!

[DavidPhillips]

I want a gear venders under-over drive but I could not find them for the transmission we have listed. Does it work with the AT in the 08 SD?

edit:

Never mind..I found it on their web site.

Seems it is hindered by the 4th gear problem as well. It simply skips over the 4th over, 5th under, drive ratio. Seems like that's where you would need it the most.

If it don't give you a gear between 4th and 5th I think it's a waste of money. If your running light truck it may be good to save 10% on highway mileage.