Would an 86 dually have a D70 or a 10.25? Isn't that about the time they changed?

 

It depends on whether it was built as a pickup or a cab and chassis. Cab and chassis builds got Danas, pickups got 10.25" rears. FWIW, the 10.25" is wider than the Dana.

 

The older f250/350's pickups came with Dana's also. You are correct I believe, an 86 may have either one. The one way to quickly tell is look for the fill plug where the oil is put in. The Dana will be on the back cover, the Ford/Sterling is on the driver's side front part of the casting, so the rear cover for it will be smooth with no plug.

P.S. I looked on car-part.com, and they differentiate the cab/chassis versus the pickup(because they are different widths) but I can't confirm if one is a Dana only or not, they do not list that info.

 

1980/89 Ford Light Truck Parts Catalog ~ Rear Axle Application Chart / WDD/WFD are Sterling 10.25's / Ignore: R = Ranger; U150 = Bronco.

 

The above chart only shows cab and chassis for the year 1989? He wanted to know about a 86. What capacity is a dually axle versus a single rear axle?

 

I just went and looked at the same catalog from which Bill posted that page...

That single page lists all the axles offered 1980/89 in F250/350 models which IIRC were the only models to have dually versions.

This listing isn't showing weight capacities.

 

I found out about the different widths when I bought my truck. The shop I get my state inspections done at had a 1986 F-350 wrecker, it had the Dana and would fit between the lift pads on the inspection bay lift, mine will not. We usually raise the lift and back mine in. The inspector uses a floor jack to raise the front wheels to check the king pins and just looks through the inspection window at the rear linings.

 

Read the 1989 application again, it says nothing about F250/350's or Cab & Chassis.

What it does say: Stripped Chassis ~ 1989 F53/F59 Dana 80 non locking (no Limited Slip) with a rear axle capacity of 11,000 lbs. Neither of these are F250/350's.

So, I should have said when I posted this page = ignore R (Ranger), U150 (Bronco) and F53/59 (Stripped Chassis).

 

It's a pickup not CnC

 

That spot that says "capacity" is the weight capacity of the axle as far as I know. Take the "M" off and move the decimal to the right 3 places. I thought that's how it worked? 6.3M would be 6300lbs. I don't know how to tell a dually from a single axle. I believe some of the axles at the top of the chart may be light duty(4.5M?)

 

I don't know how you tell the difference either, mine is a 7.4M or 7400 lb axle. Probably the only way might be the actual parts list number.

 

The WDR/WFL 4,500 lb. rear axles are 8.8's, installed in 1983/89 Light Duty F250's (though FoMoCo never referred to them as such).

Bill: Which rear axle parts list(s) would you like to see?

When the Sterlings came out, it was EZ to spot one, cuz its rear hub is much larger than the Dana's.

Standing at the back counter, all I had to do was look at the rear hubcaps/wheelcovers, cuz they were specific to either Dana's or Sterlings.

'Course, today, that wouldn't work too well, cuz peeps love to swap parts, so you might find Sterling caps/covers on F250/350 Dana's.

 

I just bought the truck I was asking about. The rear end is a 10.25 which is what I was after.

 

Bill, I didn't need to look at one, I was just referencing one I was familiar with, besides, it won't help now unless you can go from the axle tag. I swapped in a later housing after mine had spun an inner WB and messed up the tube. Best guess is I have a 93-early 94 housing.

 

Didn't the 10.25 housing change just a little in 93? My understanding is the pinion bearings are a little larger in the 93 and up versions of the 10.25?