2.64 gear ratio?

Tall 24.5 and 2.47 may god help you if you run hill country. The company I drove for had 22.5 LP and was right about 1275@62

1500 @70 I'd leave it and cruise @1400-1450

 

That's not good. Thank you for your help.

 

Freightliner wont pay for that even though they messed it up.

 

Yea dont have a choice my buddies cascadia run about 1300 at 72mph. With 2.79 gears. Too bad you can't just change the program.

 

Install 22.5 tires standard profile when your Lo profile tires wear out

 

I checked the size its 295/75 22.5. Is that standard or low. I'm not sure

 

Low pro. Standard is 11r22.5

 

Ok yea it doesn't say 11R just R 22.5. I will try that when the time comes. Thank you.

 

Yeah that's really pushing it hard with that 24.5 tall rubber, not too mention it's less efficient so it's stepping backwards on efficiency too...

My current truck runs 1100@63 , 1200@68 but it's engine is made for it (XE) and pulls like crazy.
1750lbft@1050rpm with XE.

The new TC (Turbo Compound) XE eXceed that's on order is another 150rpm lower on peak TQ ...1850@900rpm and cruising 68mph@1100rpm using 2.47s and 22.5LP

 

You must have the direct drive model.

If it was the OD model that would be much lower rpm.

To lower rpm you can either;

change transmission to a OD unit ($$$$$$)

Change to taller tires

Change rear ratio lower like 2.25 etc..


Now if your software is locking out overdrive when loaded that is something you can change. I am assuming you are in 12th with the engine hammering 1500rpm ?

If it's already in 12th ... You need to change hard parts. Nothing can be done in software.
12th at that RPM would mean it's a direct drive model Transmission.