I posted previously here https://dodgeforum.com/forum/4th-gen...ml#post3391931

...as I'm having difficulty with VIN decoders providing conflicting info. I'm using these 3 and have yet to find a 3.92 rear equipped truck.

https://www.dodge.com/webselfservice/dodge/index.html

https://researchmaniacs.com/VIN-Numb...ker/Dodge.html

https://dodgeforum.com/forum/vindecoder.php

Is there a way to tell on the rear end itself which gear set is present? I'm having a helluva time finding any units within 200 miles of South Florida with 3.92's. Are they that rare of an option? From what I'm reading I'll need the 3.92 rear and opting for 4X4 as well as I'm puling a 9500 lb. trailer (very aero efficient) with surge brakes on all 3 axles.

Additionally is one transmission (6 sp. vs. 8 sp.) an advantage over the other? I noted a lot of opinions on the rear for towing heavy loads but not much mention of which trans. is most beneficial.

Thanks for any insight you can lend.
Keith

 

I would trust the dodge website myself..... but, according to theory, there should be a tag on the differential, and also under the hood somewhere, that has gear ratio listed. Another option would be to get the BOM numbers off the differential, and look them up at the manufacturers website. (if you can, I know Dana offers that service, not sure about the rest.)

I think the 8 speed would be better for both towing, and regular driving.