What rpms are you guys running @ 65 and 70 mph, with the 6.7 motor and 6 speed automatic?

 

1650 rpm @ 65 mph
1750 rpm @ 70 mph

or something close to that. I have 3.73 gears.

 

Same as ^^ for me too

 

I have the 4:10 gears so r.p.m.'s are a little higher. 75 m.p.h. = 2k r.p.m.'s. Still lower than what my 04.5 auto used to run at that speed.

 

i wish i would have driven a 6 speed auto with 4.10's. with 3.73's i find myself leaving it in 5th a lot for the winding country roads or else it lugs or shifts in and out of 5 and 6. especially with my 315/70/17 MTZ's. im doin 80 at 2k on the highway.

 

X2 haha crap sucks. Hoping proggy and TB exhaust will help that