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I am in the process of replacing my pinion seal (8.8"), a job I have never attempted. When I removed my yoke, I noticed wear marks where I suspect the bearing contacts the shaft, as well as a less severe mark at the location where I suspect the seal made contact. I posted this same question in the 8th gen forum; there seemed to be some disagreement in the other thread about what caused the larger, deeper groove. I was hoping some folks in this section could comment.
The deep groove I am referring to is the brownish mark near the top of the picture - the green yarn in the background happens to align with the mark. I did not initially plan to replace the bearing, just the seal. I realize I should now also either replace the yoke, or use a repair sleeve, but my real question is: do I need to replace the bearing too?
Dear MIdwestbird,
Once you take the pinion yoke off you should replace your crush collar in the differential. And yes rebuilding the differential can be a bit of a hassle setting up and getting the correct tooth patter on the gears. I would suggest that your replace all the bearing in the differential if your are going as far replacing the crush sleeve. But I would take it to a professional in your area so its do right the first time and your not wasting money on parts. If you need parts like a Master Bearing Overhaul kit you should give Part-Rite in Bayville, nj a call and they can get you the parts and they can ups them to you as well.
I’m willing to bet the vibrations are the angle of your driveshaft. I was dealing with that for years. I had a 6” lift for the last 12 years with a drop bracket on the driveshaft. I had a vibration upon acceleration from the day I bought the truck. I put a GoPro under the truck and my driveshaft was all over the place while accelerating. I started with replacing all the u joints on my two piece shaft. That didn’t work so I tried shimming the bracket numerous times and that had no effect. I replaced the carrier bearing and still no change. I just lived with it and last month I finally had it with the lift and pieced everything together to return the trucks suspension back to stock. Low and behold the vibration completely disappeared. The damn vibration I’ve been chasing for 12 years was all due to the lift.
I finished this last summer. I had read plenty of folks describe two different methods of replacing this seal. I went the easy route: I put the old stake mark on the pinion nut back to the position it was in before I removed it. As far as the groove marks I described, I just light blended the marks with Emory cloth before installing the new seal. In the last year I haven't had any issues, and no more oil dripping.
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