There is money to be made with 9+ mpg trucks

To figure out the rear end ratio we'd also need to know whether it is an "A" "B" or "C" overdrive to get the reduction ratio in the tranny. Going to be close to a 3.36 or 3.42.

 

I can ask tomorrow ....

 

There should be a tag inside your door with the engine/tranny/ and rear information. Anyways, the "A" "B" "C" model of overdrive is the last number of the the transmission model. On the OD 10 speed it is something like FRO16210B

I think with Eaton 10 speed transmissions .83, .84, or .85 final reduction are your choices.

 

best I can give you from those tags it VIN, weights, tire sizes and axle ratings.


None of the rear end or tranny data is there.

 

Yours pulls like mi e and mine is a 3.36 rear end. CAT C15 with 500hp. Plenty of motor, crap rear end.

 

found the components tag...

It was in the glove box not on the door sills.
DD15
FRO-15210C
Rears are 3.42

Rated at 455/475 1800/2000.

 

Because some bean counting engineer told them that's they only way to get good fuel mileage.

 

Fixed it..........

 

Thanks but I don't think most accountants would know the front from the back on a truck let alone how to get good mpg's. Now maybe the accountant told the engineer that they need better mpg's lol