Duramax???

[Camaromax]

Hey I got a question for anyone with a Duramax truck. What rpm is the engine at when you are in O.D. at 70 mph. I need this information to compute what gear to run in my car thanks. Also which transmission do you have 5 or 6 spd and stock or afteer market tire size.

Thanks any help is appreciated

[camcojb]

Originally Posted by Camaromax

Hey I got a question for anyone with a Duramax truck. What rpm is the engine at when you are in O.D. at 70 mph. I need this information to compute what gear to run in my car thanks. Also which transmission do you have 5 or 6 spd and stock or afteer market tire size.

Thanks any help is appreciated

mine is an 07.5 with the 6 speed Allison. Stock tires/wheels (265/70-17) it's 1750 rpms or so at 70 mph. Realize that there were two or three different wheel/tire packages stock, so they're not all the same height. This should give you a good idea though. 3.70 gears also, stock on these trucks. Tires are probably 32" or a bit more tall.

Jody