Hey numberdummy! Trying to figure out the axle ratio and transmission model on this n850.

W85zu644172

Trans axle 2f f


Can you crack the code?

Thanks for the help!

 

W85 = NT850 diesel.

Z = Cummins model 9HE-195 753 cid 6 cylinder diesel.

U = Louisville KY Assembly Plant.

644172 = 1965.

Trans/axle codes do not make sense. Please look at them again or post a pic of the Warranty Plate.

The TRANS code is listed first, then a space...followed by the AXLE code, but there is no TRANS code of 2F nor is there an AXLE code of FF.

The following might be correct, might not.

TRANS code 2: Transmatic (Allison) model MT-40 6 speed A/T

AXLE code F: Timken model R141 Rear Rear Single Speed Axle / 6.14-1 / 34,000 lbs. Rear Axle Capacity.

 

Hey thanks for looking into that, definitely not an alison. It appears to be a 4 and 4 married together?

​​​​heres that plate, if it'll help.. looks like the rears will need to go. 6 to 1 is not going to work..

Warranty tag

 

It doesn't have an Allison, but what it does have, will require further investigation.

No TRANS code: A transmission that was not an RPO (Regular Production Order) was installed, that was specified by the original purchaser.

VIN decoded in post #2.

158" Wheelbase.

J = Rangoon Red.

W854 = NT850 (diesel); 45,000 lbs. GVWR

D81B: D = Light Beige Crush Vinyl & Medium Beige Ladder Pattern Woven Plastic / 81B = Custom Cab.

AXLE 2FF:

2F = Eaton model 34DSA Forward Rear & Rear Rear Single Speed Axle / 4.88-1.

F = Rockwell-Timken model FE-970 11,000 lbs. Capacity Front Axle.

45,000 lbs. Gross Vehicle Weight Rating.

184 net HP @ 1,950 RPM

420068:

42 = Fargo ND Ford District Sales Office, where the original selling dealer ordered the truck from.

0068 = Domestic Special Order number, truck ordered special by the original purchaser, not "bought off the lot."

The above 4 digit DSO code refers to the non standard (not an RPO-Regular Production Order) transmission that was installed.

DSO parts are not listed in the parts catalog, so in this case...if trans parts were required, the dealer contacts FoMoCo with the DSO code.

FoMoCo looks up the order, passes the info back to the dealer where the trans parts could be found.