Well from what I have searched and found plus what is in the CDRom shop manuals & Paper manuals.

Unless it is a flange to flange measurement difference ........There is no difference in the axle assembly, the difference is in the wheels/rims and the wheel flares on the box.

The only reference to a duallie is of the rims and a spacer plate.

 

The dana 61 was a Light duty diff! what is a spacerplate on ? I'll go and take some measurements for you guys. To the inexperienced eye a dana/spicer 60 looks same as a dana 70. I have probably 20 dana/spicer 60s and 70s so I go and measure some for you. What you read in the books does not alwsays come true!

 

The FORD Shop manual shows a spacer plate at the 8 bolt hub/wheel.

 

The only difference between a '73-79 SRW and DRW Dana 70 is the brakes. The drum back plate mount is welded further in on the axle to allow the dual wheels to clear the drums. There isn't enough room to move the spring pads to put it under a F-250.

Isn't the Dana 61 rated at the same capacity as the Dana 60?

 

The 60 and the 61 are essentially the same in strength and design. The difference is in how the carrier gear splits are. Normally for high (numerically low) gearing.

Jason

 

Sorry to hear it got rolled Aaron. What happened ? Was everybody involved ok ? Thats a shame, it was such a nice clean truck. Did you have full coverage on it ?

 

Ok this is 1st hand dana 70 experience. I owned a 1978 F350 single wheel regular cab extended wheel base pickup (tire compartment inside R boxside) When I blew engine after driving it for 3 months with only 2nd gear, we used rear end in (Pig Hauler)1979 F350 dual rear wheel cab/chassis model shorter of the two wheel bases offered. It was a bolt in same brakes , spring pads,park brake cables, even down to the Ubolt to axle shock mounts! both had 2.25" springs and narrow frame, 1978 had small plastic rear tank. If it wasn't for the box on the 78, Duals would have bolted on.

Also 1st hand : bought a rear axle from a 1979 F350 supercab pickup (single wheel) dana 70. Had 77 F250 supercab camperspecial, removed worn out dana 60, spindles worn down to nubs(ok I stretched that part) bolted in including shock mounts etc etc. then we upgraded brakes to 12x3 from a E350 single wheel, 1986 I think, and got slide over drums/hubs. both axles were 3" wide leafs and wide frame with flat rear tank.
There were lots of parts inter changability, personally I have never seen a dually pickup(dually flared fenders etc) before 1980. As for the dana 61 I saw probably 10-15 of those and they were all 3.07 and 3.31 ratio, and in the lower gvw ratings with single piston front caliper trucks. 6900lb GVW I think.All were 1977-1979. Never saved 1, they were all worn out, mostly carriers and R&Ps.

Wouldn't that have been great if I could have kept them all!!!!

 

68 merc,

So does the first paragraph confirm post #16 ?

 

Mil1ion: No there are several different flange to flange configurations. If you are talking about axle flange to flange. The actual flange to flange measurements are different . I also have a 1984 F250 D70 rear diff in one of my Supercab shortbeds, it has a smooth centre housing ,like most of the Eseries , but has the same measurements flange to flange as the 1979 F350 supercab D70 has, but its housing is much more reinforced and gusseted.
The Dana 70 "dually" 80-85~~~~~housing is a reinforced housing but flange to flange measure ments are almost 12" wider.

 

I figured the flange to flange was different .....thus my wording in that sentence.

You confirm that there is in fact differences besides the wheels/rims and spacer plate by stating this:
I also have a 1984 F250 D70 rear diff in one of my Supercab shortbeds, it has a smooth centre housing ,like most of the Eseries , but has the same measurements flange to flange as the 1979 F350 supercab D70 has, but its housing is much more reinforced and gusseted. The Dana 70 "dually" 80-85~~~~~housing is a reinforced housing but flange to flange measure ments are almost 12" wider.

Thanks, I can know include that if another ? like this comes up as the shop manual doesn't mention any of this.Some rear axle articles don;t mention it either

 

All 1 ton frames through 79 had the narrow 34 in frame and 2 1/2in leifs , dually or not. So if I guess the question is did they make F250 duallies and if so were they the narrow frames and leifs or not. If not that is what you need. If so you might be able to move the spring pads out maybe.
Leadmic

 

leadmic:
Most 79 F350s were narrow rearframe and axle 2.25" springs, dual rear wheels will clear the frame on all those. But Ford made a F350 supercab 2wd dana70 and a F350 regular cab 4x4 dana60 and both had the wide frame and flat rear tank and 3" rear springs, duals will not clear frame .
As for dana 60 dually axle, maybe before 1961 thats as far back as my brain goes.
Ford did start with dana60 7F front axles around 1985 which accept the dual offset wheel. Or you can use the newer hubs on an older dana 60 front.