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1980 Chev rear end question

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old

04-07-2008 17:43:05

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Today when I was putting on new brakes all the way around I noticed that the pinion shaft had about an 1/8 inch of play in it. So can a person just torque down the nut on the end to tighten it up or do you have to take it apart to fix this play. Its a 4X4 heavy half ton truck. Thanks

Hobby farm

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jdemaris

04-08-2008 05:56:41

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Re: 1980 Chev rear end question in reply to old, 04-07-2008 17:43:05

It's a easy fix - just tighten the nut until you get to zero play - and don't go any tighter. A Chevy "Heavy Half" usually has a 12 bolt rear.
Restake the nut with a small chisel or punch - or use Loctite on it.

I've had many get a little loose after 100K or 200K miles- tightened them up and they worked fine afterwards. Just don't overtighten. I've seen many good rears get ruined when some bozo tries to put in a new seal, over-tightens the pinion nut, and burns up those bearings.

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Jiles

04-07-2008 19:42:48

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Re: 1980 Chev rear end question in reply to old, 04-07-2008 17:43:05

I would just drive the truck. It should run for years even with the "whine" If you start tightening the pinion nut and don't know what you are doing you should have at least a good used defferential located. I would compare this to tightening the sector in a steering unit that is worn out. Tool and Die Maker and mechanic--been there and done that years ago!

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jose bagge

04-07-2008 18:15:28

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Re: 1980 Chev rear end question in reply to old, 04-07-2008 17:43:05

1/8 inch is not outrageous- if it were truly horrible, it would have wallowed out the seal by now. Tighten it down- as mentioned, you've got a crush sleeve there, so don't really crack on it, just a few swipes to take out some slop.

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MarkB_MI

04-07-2008 18:07:50

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Re: 1980 Chev rear end question in reply to old, 04-07-2008 17:43:05

There's a crush sleeve between the two Timken bearings. When the rear end is assembled, the bearing preload is set by tightening the pinion nut and checking the preload with an inch-pound torque wrench. If you've got an eighth-inch of play, I imagine your rear end is making enough noise that you're having a hard time turning the radio up high enough to mask the rear end whine.

The "right" thing to do is to tear the rear end down, replace the bearings, set up the pinion preload, ring gear backlash, etc. But you probably don't drive this vehicle enough to justify a $500+ rebuild. You should be able to tighten the pinion nut a bit and get by. It takes very little movement on the nut to take the slop out of the pinion bearings. Tighten a 1/16 of a turn at a time and check to see if you have a little preload on the bearings. As soon as you feel a little resistance when you try to turn the pinion by hand, stop.

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