My axle tag reads (3.55 10 2 5L05) but my door tag say axle code 39?
So do I have a 8.8 open diff? I was expecting the axle tag to read something like 3.55 8.8 blah blah.

Any input would be appreciated.

Thanks

 

Axle code 39 is a 3.55 and your tag reads 3.55. If you have a rear cover with bolts, you do have a 8.8 rear.

 

Here is what the parts catalog says for 39 on the Certification Label:

https://www.ford-trucks.com/forums/1...l#post11225573




Here is the information on the axle tags:

 

Yep, 3.55 open diff. It could be either the 8.8 or 9".

 

By posting this rear axle ID tag code, you answered your own question. If it was an 8.8, the tag wouldn't have 10 25 stamped on it.

Sterling 10.25" Rear Axle / 3.55-1 / L05 = Assembled November (L) 1985 (05).

39 = Sterling 10.25" Rear Axle / 3.55-1 / No Limited Slip / 6,250 lbs. Rear Axle Capacity.

1959 thru today: If the AXLE code stamped on the Warranty Plate (1959/79), printed on the Certification Label (1980/) begins with a letter: Limited Slip.

If the AXLE code begins with a number: No Limited Slip.

bruno2: OP's "About Me" profile says: 1986 F250. No F250 came with a 9 inch. And, as you can see, it's not an 8.8 either.

 

Let us know if it is a 3/4 or 1 ton also . Everyone assumed it was a 1/2 ton. They have 9" and 8.8's in them. The 3/4's have sterling 10.25 or Dana 60's. Good thing number dummy chimed in.

 

Yep its a 86 f250 bb 460 c6 auto so im guess 3/4 ?

sorry noob <<<<----

 

NumberDummy chiming in again.

1983/89 "Light Duty" F250's came with (believe it or not) 8.8's, but the OP's truck isn't a "Light Duty" since the ID tag has 10 25 stamped on it.

Some 1980/86 F250 'Heavy Duty's' also came with Dana 61's. FoMoCo confusion: Never referred to F250's as light or heavy duty's, except in the parts catalog.

8.8 introduced in 1983, but some 1983/86 F100/150's & Bronco's came with 9's, as it depended on the applications.