9" ford rear end seals question? What rear end seals do you use when you take off the backing plates to use a disk set-up? i'm looking for part numbers for the axle tube seals for disks.
As Toomany said they are the same ones that you use with the drum set-up. If you didn't change them when you converted it's possible they were damaged when you R&R'd the axles.
Actually, it depends on what disks you are putting on it and which bearings they are designed to run with. 9 inches came with two configurations: conical roller bearings in which case the oil seal was in the backing plate not the axle tube as stated earlier, and sealed ball bearing in which case there was a seal before the bearing inside the axle tubes. You will need to use whatever setup the disk and axle tubes were designed to work with, but the oe disk setups I have seen are designed to work with a seal in the backing plate itself. The third option is a sealed, oringed, bearing with no oil seal at all. This is what I had to do since I used large aftermarket axles and the axle tubes were not machined for the inner seals.
Hmmmm. Chris is right - lots of variables here. I reckon that first, once you figure you need the inside seal, you need to mic. the seal register's ID, inside the axle tube, then check the OD on the machined inboard seal surfaces on the axles to be used, then give the dimensions to a knowledgeable counterman with a good seal crossover reference catalog. Then make sure that when the seal is seated and axle installed, the lip of the seal is centered up on the axle's seal surface.
I'd go with Viton seals if you can get 'em. My small contribution to the ramblings...
From the initial post it sounded as if, and I think Toomany interpreted it the same, he was putting a conversion set on a standard drum rearend. If you only are converting and using the standard axles there is no need for different seals, he didn't indicate (as a matter of fact he referenced an 8" which never came with discs) that it was any type of factory equipment set-up.
From the initial post it sounded as if, and I think Toomany interpreted it the same, he was putting a conversion set on a standard drum rearend. If you only are converting and using the standard axles there is no need for different seals, he didn't indicate (as a matter of fact he referenced an 8" which never came with discs) that it was any type of factory equipment set-up.
Not trying to pick, but I thought that the late model 8 inches that came in mustangs and explorers were disk brake rears. I have heard it is an easy conversion from these to a 9 inch, but I have no data to support that. Maybe it is an 8.?? I am thinking of. Never done any work on anything other than a 9 myself.
Turbo, you're thinking of an 8.8. It's a totally different rearend, has an intregal carrier, the 8" (which has been out of production since probably the late'70's) looked like a smaller 9".
Turbo, you're thinking of an 8.8. It's a totally different rearend, has an intregal carrier, the 8" (which has been out of production since probaly the late'70's) looked like a smaller 9".
Ah ha!! Now my head is screwed on straight. I know exactly what you are talking about now. After I posted, I got to thinking about the 8.8 disk rears. I had forgotten about the little cheese weiner 8 inchers.
As for the aftermarket kit, I would be willing to bet it is designed to be used with the sealed bearings. Using a roller bearing setup requires a more difficult design on the backing plate since the seal surface has to also be added. The aftermarket kits I have seen were just a flat retainer plate with no provision for a seal. I would talk to the manufacturor about it.
Turbo, the seal he's referring to is inside the axle tube and is on the inside of the bearing, so is unaffected by any change in the flange/retainer. That's why I mentioned cutting it with the axle upon r&r, those splines can cut a hard seal in no time, that's why it's important to take the axle out carefully trying to keep it centered through the seal.
Turbo, the seal he's referring to is inside the axle tube and is on the inside of the bearing, so is unaffected by any change in the flange/retainer. That's why I mentioned cutting it with the axle upon r&r, those splines can cut a hard seal in no time, that's why it's important to take the axle out carefully trying to keep it centered through the seal.
Actually, I am thinking they are on in the retainer plate since that was his concern. This would mean he is running a conical bearing as opposed to the sealed roller. That is why I mentioned all the options, but maybe I am reading this wrong.
Chris
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