2001 Dodge Ram service Manual Link for ya...

http://www.rm-indy.com/wavefiles/2001ramsrvcmanual.zip

 

If you toggle the Od Switch, then you should be turning it off thus increasing RPMs. if you are saying that that is what is happening, seems like everything maybe normal since you have oversized tires, low gear ratio and high speed. Correct me if I'm wrong but does that sound right?

 

i have 35s and according to my build sheet, i have 3.92s and im well below 2k at 70 with od on

 

how can you be well below.....how much lower are we talking?

i run 4.10's with 265/75/16 tires, and i run 2100 at 70

 

I cant recall for 70mph, but since i did a constant 79-82 its about 2500- on 37" and factory 4.10. But then again I adjusted the shift rpm and tire size on my Hypertech. I kept it under 85mph so DPS or Highway patrol doesnt stop me.

 

Mine runs around 1700-1900RPM depending on road and conditions.

Thats with 285/75/16's btw.

 

I have 2 1999 1500's, one 5.9, the other 5.2 and at 70 it better be downhill in either truck to go below 2000 rpm at 70mph, both are mostly stock, exc air filters and hot coils. one has a new tranny and one has a wasted tranny. they both have the same gears (3.950) and 235/85/16 lt load E tires.
So how can you be getting 1700 rpm at 70, and more importantly, how can I get there?

 

Whoa..this thread is two years old..trying to bring it back to life there huh?

 

It's called 3.55 gears and 33 in tires.
BAM!
Since the interstate is 75 now, I run at 2-2100 rpm now.
trolololol
I will answer his question though.

 

1900 at 70mph