RPM @ 75 MPH?

[josie jarrett]

Correct, unless you got a 2019 then it’s the zf 8hp75

Thank you

 

[josie jarrett]

You can add your vehicle to MOPARs site and it will show you everything on the truck from the factory (including rear gears).

I can't get the site to work..It lets me open it but won't let me register an account ...Is there another site where I can register ?

 

[Nickx86]

I can't get the site to work..It lets me open it but won't let me register an account ...Is there another site where I can register ?

You can use www.grimmjeeper.com

They won’t show the 66rfe transmission but you can use the 68rfe selection since the gear ratios are identical. You can play around w gearing, tire size, gives you a lot of useful charts to compare

 

[josie jarrett]

You can use www.grimmjeeper.com

They won’t show the 66rfe transmission but you can use the 68rfe selection since the gear ratios are identical. You can play around w gearing, tire size, gives you a lot of useful charts to compare

Ok Ill give it a try ! Thank you very much