Rear yoke replacement

[Wayne P.]

Attached is a couple pictures. Is it required to take the rear end out to take the yoke out to replace the seal ? I took it out last year and it was a royal pain . I was hoping for an easier method. would the nut be 1 1/8" Thanks for any positive advice.

[Wayne M.]

Re: Rear yoke replacement

Not necessary to remove the diff just to replace the pinion seal. Method and tools are decribed in the shop manuals. Would be best if the car is on a hoist. You'll probably need the Kent-Moore specialty tools J-8614-1, -2 and -3.

The nut is 1_1/8".

[Edward J.]

Re: Rear yoke replacement

Wayne P. the 63 is alittle easier if you still have the 63 housing in the car, The front two bolts are threaded into housing and will allow the nose to be tilted down. to make the job alittle easier. If not the 63 housing there are no short cuts.

[Wayne P.]

Re: Rear yoke replacement

The nut seemed fairly easy to get off . I have the yoke off and now the issue getting the seal out. I will take another look at the manuel. Thanks

[John H.]

Re: Rear yoke replacement

Wayne -

Don't forget to pack the recess at the forward end of the splines behind the big flat washer with Permatex #2 before you install the washer and nut; otherwise it can leak lube through the splines (they didn't add that note to the Chassis Service Manual until 1969).

[Wayne P.]

Re: Rear yoke replacement

Thanks John I did that last time and it hardened up. came off in black chunks. I thought it was to stay semi soft ? I will give it a good cleaning first.
Any advice on seal manufactuer ?

[Michael M.]

Re: Rear yoke replacement

Isn't there a crush sleeve on the front pinion that also needs to be replaced for correct bearing pre-load? I could be wrong, certainly not an expert in this area.

[Wayne P.]

Re: Rear yoke replacement

I marked the spindle and the nut. It should align to give me the correct torque. Did it before like this. Seemed to work. If I were to rebuild it you are correct.

[John H.]

Re: Rear yoke replacement

Thanks John I did that last time and it hardened up. came off in black chunks. I thought it was to stay semi soft ? I will give it a good cleaning first.
Any advice on seal manufactuer ?

Wayne -

Chicago Rawhide and National make good seals, at least in my experience. If the seal lip failed, make sure the O.D. seal surface on the yoke is nice and smooth where the lip rides; if necessary, they make "speedi-sleeves" for that just like those for balancer hubs.

[Wayne P.]

Re: Rear yoke replacement

Thanks John yes I placed a speady seal to get it back to spec . I have it back togeather . Now Drive shaft fun.

[Wayne M.]

Re: Rear yoke replacement

Request opinions on the pitted surface (where the seal lip rides) on this '986' cast diff.drive pinion (input) yoke [ 32 spline for '65-up 1310 universal joints]. Got it off eBay. You can feel the roughness with a fingernail, but not even a groove, or if so, under a thou deep.

I have another 986 yoke with a deeper (and smoother) wear groove from my FA_7_15_65 diff, and this has never leaked.

I show 2 seals; one on left is what I believe to be the original out of my FB_7_21_65 carrier, going by the stamped # 3852984, which parts history says changed to 3817883 on 1-68, then again to 3924031 on 7-68. Seal on the right is a Chicago Rawhide CR___USA____17190.

Where would I find one of these speedy sleeves ? Does the yoke seal surface have to be milled down to compensate for sleeve thickness ?

[John H.]

Re: Rear yoke replacement

Request opinions on the pitted surface (where the seal lip rides) on this '986' cast diff.drive pinion (input) yoke [ 32 spline for '65-up 1310 universal joints]. Got it off eBay. You can feel the roughness with a fingernail, but not even a groove, or if so, under a thou deep.

I have another 986 yoke with a deeper (and smoother) wear groove from my FA_7_15_65 diff, and this has never leaked.

I show 2 seals; one on left is what I believe to be the original out of my FB_7_21_65 carrier, going by the stamped # 3852984, which parts history says changed to 3817883 on 1-68, then again to 3924031 on 7-68. Seal on the right is a Chicago Rawhide CR___USA____17190.

Where would I find one of these speedy sleeves ? Does the yoke seal surface have to be milled down to compensate for sleeve thickness ?

Wayne -

NAPA has them - SKF is one of several suppliers; no need to machine the seal surface.

[Michael F.]

Re: Rear yoke replacement

some old school techs cut hole in fiberglass above and worked on it from inside car, same done by some in replacing u-joints.