Sorry about that; I had tried to set it up so that OB would copy the files to reference locally. I changed it to link directly to the original pictures...it should work now; let me know if it doesn'tlinks not working for me
Sorry about that; I had tried to set it up so that OB would copy the files to reference locally. I changed it to link directly to the original pictures...it should work now; let me know if it doesn'tlinks not working for me
My '84 book ('83 should have used the same codes) shows a Dana open axle, 3.07 gears, and 6250 lbs capacity. IITC that should be a semi-floating Dana 60...do you have hubs/axleshaft end caps sticking out from the brake drum a few inches?
The semi-floating Dana 60 is a rare bird especially behind a diesel (it's more of a light-duty F-250 thing), but I've seen a couple on '83 and '84 trucks, so I can say with authority that they do exist...even though most semi-floating axles are 5-lugs and found on half-tons.
Full-floating axle:You must be registered for see images attach
Semi-floating axle:You must be registered for see images
A full-foating axle's more sturdy and can hold more weight...so, I have a feeling that either '83 and '84 didn't use the same codes after all (which would surprise me; '84 and '85 codes are identical for Dana axles), or someone swapped axles on your truck, or I'm wrong and Code 31 is a Dana 60 full-floater (the FSM doesn't specify which axle is which; only lists the manufacturer i.e. Ford or Dana, along with the weight rating). I would try to verify what gear ratio you have...I don't know from the Ford part number which axle you have; maybe someone else does? FWIW my Dana 70 has "70U" cast in the webbing near the pumpkin...I don't know if Dana 60's did similar or not...It's a full floating axle..so what does all of that mean?
With all due respect, I have seen factory light-duty F-250's with semi-floating 3.07 Dana 60's that were powered by 6.9l's. I think this option only existed in '83 and '84, and it was a very rare option, but it did exist. These axles were factory equipment, as referred from the build sticker on the doorjamb, and the trucks were factory-equipped with the IDI. FWIW one of these trucks was equipped with the only dealer-installed air conditioning system that I've seen with my own eyes...complete with York a/c compressorSince the Diesel was only offered only in the the F250HD trucks (8600# GVW) that only had full floaters (either a D61 to mid'85 and the Sterling after), the semi-floats offered in the regular F250 (6600# GVW) ('80-'85 it was a D60-3, from mid '85 on it was a semi-float 10.25 Sterling) (6600# GVW) wasn't part of the package. The axles are easily swapped, however, since the spring perch dimensions are the same for both axles and trucks. The input torque of the two Sterlings is the same but the GAW is obviously considerably different (5300# vs 6250 on the Danas).
Ooops, now I see he has a full floater. An '83 diesel would have had a Dana 61-1 full floater, which is very similar to a Dana 60 visually but it has some internal differences that allow it to carry gears as tall as 3.07:1. Only two ratios offered in 4x4s, 3.54 or 4.10:1. 4x2s also had a 3.07:1 but according to my '83 Data book, it was only offered with manual transmissions. I didn't look at later years.
Also, I know of at least two '83-'84 trucks that have factory Dana 70 axles...Mel's Moose Truck (an '83 F-250) has a Dana 70, and so does my '84 F-250.
I'll to check again tomorrow, but my 84 has a d60.Every early 85 and down diesel ford I have seen also had a dana 70 rear axle. I have yet to see one with anything different.