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Pinion Bearing Preload

zaac

By zaac
in Ask A GM Technician

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zaac Enthusiast

zaac

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I put in new bearings and seal and was supposed to set preload at 20-25 in-lbs. I got impatient and ended up blowing right through that and ended up at 31 in-lbs. Is this gonna significantly shorten bearing life? It's a 8.625 rear end. Thanks in advance...Jack

zaac Enthusiast

zaac

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I pulled out the carrier and rechecked the pinion preload without it and it was at 24. From what I could find it should be 14-19 in-lbs so I'm gonna get a new crush sleeve on Monday and do it more carefully. I've noticed there's not much help around here. How come the Ford website has a half million members and there's only 50k here?

ScottyBoy Enthusiast

ScottyBoy

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How come the Ford website has a half million members and there's only 50k here?

I dunno, go ask the ford guys. Maybe its because many more fords guys have problems they need help with. And maybe cuz most Chevy owners actually don't have as many problems with their trucks as much as the FORDs (Fixed Or Repaired Daily) do. I know aside from the steering shaft clunk I used to have, I've never really had any problems outta my truck. My truck is a beast, thats why I call her the "Green Monster" (that also explains my avatar). :dunno:

zaac Enthusiast

zaac

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How come the Ford website has a half million members and there's only 50k here?

I dunno, go ask the ford guys. Maybe its because many more fords guys have problems they need help with. And maybe cuz most Chevy owners actually don't have as many problems with their trucks as much as the FORDs (Fixed Or Repaired Daily) do. I know aside from the steering shaft clunk I used to have, I've never really had any problems outta my truck. My truck is a beast, thats why I call her the "Green Monster" (that also explains my avatar). :)

 

I new if I got ignorant I`d get a response. :dunno: Now that you put me in my place do you know anything about rear ends. I`ve been babying this truck but it`s still breaking me. Guess I got a lemon. Tranny, 2 fuel pumps, encoder, 4wd buttons, front hub, ball joints, U joints and now both diffs getting rebuilt. I`d imagine the TC won`t be long. 140k and only the last year has been off road and gentle off road at that. I`m starting to see why the Fords have been no. 1 seller since `76. :lol:

ScottyBoy Enthusiast

ScottyBoy

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How long have you owned the truck? Everything you are talking about seems like they would all be linked to severe duty towing. The previous owner must have literally worked the shit outta that thruck. Think about it, if you were constantly towing over 8000lbs wouldn't that stress the tranny, suspension, rear end, etc. ?? And as for the rear end, yes I did have problems with my rear end. It was making a slight clunking sound (which I just thought was a suspension bushing or something) and it ended up being my pinion bearings were bad. But mine went out at less than 80,000 miles (which the dealer said is EXTREMELY rare, the rear end going out at any mileage on these trucks he said is pretty rare) and luckily my extended warranty covered the entire cost of the repairs. But I didn't even realize anything was wrong because it still drove, functioned and even towed perfectly fine. Only thing was the slight clunking I mentioned,(mainly on bumpy roads) so I brought it in to have the suspension checked.

zaac Enthusiast

zaac

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How long have you owned the truck? Everything you are talking about seems like they would all be linked to severe duty towing. The previous owner must have literally worked the shit outta that thruck. Think about it, if you were constantly towing over 8000lbs wouldn't that stress the tranny, suspension, rear end, etc. ?? And as for the rear end, yes I did have problems with my rear end. It was making a slight clunking sound (which I just thought was a suspension bushing or something) and it ended up being my pinion bearings were bad. But mine went out at less than 80,000 miles (which the dealer said is EXTREMELY rare, the rear end going out at any mileage on these trucks he said is pretty rare) and luckily my extended warranty covered the entire cost of the repairs. But I didn't even realize anything was wrong because it still drove, functioned and even towed perfectly fine. Only thing was the slight clunking I mentioned,(mainly on bumpy roads) so I brought it in to have the suspension checked.

Actually the truck was never off pavement and driven easy its whole life. I bought it of my Dad so that's why I know the history so well. I bought it a year ago for work which is mostly offroad but at an easy pace. The Fords at work break down too, I just said that to get some attention. :P The bearings in the rear end were fine, it was the clutches in the G80 that were wasted. I'm sure the truetrac will outlast it if I ever get the dang preload, backlash and pattern right. Should get the front diff back tomorrow from the shop. Hopefully they find something that is causing the noisy 4wd.

zaac Enthusiast

zaac

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Too much preload will kill the bearings. Your going to have to tear the end open and replace the crush sleeve.

That's what I figured so I re-did it again today and got it right where I wanted it. Hopefully she'll last. My Dad even has some Amsoil 75-90 gear oil for me. :thumbs: Thanks for the help.

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