I have a 86 f-150 with 302/efi 4wd with AOD. What kind of rear end do I have? I think my gears are 4:10. What are the possibilites?

 

I would think that you have a Ford 8.8 rear end. If it has not been removed, there should be a metal tag on the differential cover bolts that gives the axle ratio.

 

My buddy has an 86 f150 4x4 and his has a 9 inch. If it has no coverpan bolts (coverpan is non-removable) on the back of the housing its a 9 inch, if it does it will be an 8.8.


"Don't Laugh At This Truck Mister, Your Daughter Might Be In Here!!"
'78 F250 4x4/302/NP435/NP205
lifted/"35 mudders
'78 F100 2wd/360/C-6/"9 inch
4bbl int+carb

 

Ford starting using the 8.8 in 1984 instead of the 9 inch.

 

it was 83, but they still put them in trucks with the 351ho, mine had one, along with a few others i know of

 

I have an 84 F150 with a 351 HO and the 9 inch rear end. What is the dana equivelant to the 9 inch and the 8.8? Correct me if I am wrong but the 10.25 is equivelant to somewhere around the Dana 60 is it not? Thanks

 

For what it's worth, the Dana 44 has a ring gear diameter of 8.5", the 8.8, well 8.8" and the same for the nine. A Dana 60 has a ring diameter of 9.75". There are other things to consider, the D60 is the only full-floater design for the rear. All the others are semi-floating. Not sure on the rear application of the D44 as far as axle retension, but the 8.8" uses a "C" clip in the diff (break an axle, lose the wheel), the nine uses a pressed bearing and retainer plate on the end of the axle (lose a wheel only if the break is at the flange). Personally, other than the D60, I believe the the nine is the strongest.

 

the 10.25 came in semi floating and full floating, the full floating 10.25 is a very good, reliable strong axle, just as strong, if not stronger than the 60, they used it in f-250's with diesels all the way up to 98

 

Thanks,

How can you tell if its a semi-floating or a full-floating. My dad has an 85 F250 4x4 with a light duty rear end, and my bud has an 82 F250 4x4 with a heavy duty rear end.

 

[updated:LAST EDITED ON 04-Dec-01 AT 07:48 PM (EST)]Fairly easy, just look in the center of the wheel, if it's the brake drum you are looking at, then it's a semi. If there is a hub in the center, kinda like the front on a 4x, then it's a full-floater. This really refers to the way the weight of the truck is carried, a semi-floating rear only "floats" the axle at the diff, the weight of the vehical is on the axle thru the bearings at the flange or outer end of the tube. A full-floating has seperate wheel bearings that actually carry the weight of the vehical, like on the front of solid axle 4x's and the axle just "floats" inside the axle tube on both ends. Hope this helps! Sorry, didn't mean the 10.25" or any other axle other than those I mentioned when refering to the "only" full-floating design, I have never seen a full-floating D44 rear, for the rear, although all front ones are.

 

Thanks this helps a lot.

 

I have read that the 10.25 and the D60 are really close in strength...with a slight edge to the D60. (off the wall opion start......now) BUT if you want to get a strong axle that is almost everywhere....the 9" is the way to go....you dont need a D60 or full floater unless you are going to seriously run rocks with locker all the way around or GOBS of HP. The 9" doesnt use C-clips and has lots of bearings to support it (Pocket Bearing on the Pinion gear) AND its a 3rd member axle....Man you can take it out and do the gears on the bench....OR take it out and take it to a machine shop...Either way, labor for set up is less. Also....upgrade parts are way easy to find for the 9" Its also weighs less than a full floter. Im done....remember that they also ran a Dana 60 that was a semi-floter (mid-70's). Lots of info in P4W&OR April 2000....see saving thoes old mags do pay off!