Need some help - Differential repair

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  #1  
Old 01-16-05, 11:36 AM
JCJC
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Need some help - Differential repair

Never worked on a rear, but theres always a first time. It's a 1995 Tahoe, 4wd. Driver side axel has to much play. Not sure if it's the bearing or differential. Any way if it is the differential, do you need special tools and does it require specialised measurements, etc. Also, does anyone know where I can get a detailed manuel which would provide step by step rear end work?. I have the haynes for each model year but it only provides basic info. not detailed for complete rebuild. Any suggestions or help would be appreciated.

Kevin
 
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Old 01-16-05, 12:42 PM
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Describe the play a little better.Special tools are required to do certain things some repairs require only regular tools.
 
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Old 01-16-05, 12:57 PM
JCJC
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Davo - amount of play

We pulled wheel and brake drum off and you can pull axel shaft about an 1" or so in / out. The reason for the check was a clunking noise coming from the rear while driving. It is intermitting and sounded like something was binding.
 
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Old 01-16-05, 03:02 PM
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Can't tell you about the play but the best book is the factory service manual. You can check on Ebay or go to www.helminc.com for a new original.
 
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Old 01-16-05, 05:15 PM
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Originally Posted by JCJC
We pulled wheel and brake drum off and you can pull axel shaft about an 1" or so in / out. The reason for the check was a clunking noise coming from the rear while driving. It is intermitting and sounded like something was binding.
I can almost gaurantee that's not your clunking noise. Some play there is normal. I think you may be exaggerating a little on the one inch. If the play does get excessive, it's usually wear in the locking pin that locks everything into place in the differential but I've never seen that cause a noise.
The binding you refer to, could this be a chatter when turning a corner with a limitted slip differential? If so, simply add a bottle of friction modifier that can be purchased at the dealer or some parts stores.
 
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Old 01-17-05, 05:05 AM
JCJC
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Desi501

Desi,

Never had the clunking before and it's intermitting. Will check the other side for play, but it was a lot more then I expected.

Question, if it's wear on the locking pin, is this nothing more then replacing the pin, or could it be wear on the axel where the pin locks into? Just trying to get a better understanding before I attemp a repair that I have not done before. I would assume that if there is play in the locking pin, that this could cause the gears to move out of alingment and cause the clunking?

Thanks,

Kevin
 
  #7  
Old 01-17-05, 12:07 PM
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If it is a limited slip (look for a tag on the filler plug) and the clunking is only when going around corners a drain and re-fill with GM fluid and a bottle of GM friction modifier may take care of it.

If the locking pin desi refers to is the shaft for the pinion gears I have not seen those wear. But if it did it could cause excessive end play in the axle. GM used to have different thickness c-shaped axle retainers to adjust axle end play but they would not begin to take up an inch.

No special tools required to remove the pinion gear (I mean the shaft for the 2 small gears not the big main pinion) shaft but here are some tips. Make sure you can tap the pinion gear shaft silghtly so you can see it move a tiny bit. I have had the lock bolt break off because the lock bolt was bound up in the pinion gear shaft.

When you slide the pinion gear shaft out rotate the shaft so it will just barely come out near the bottom of the housing. Put uour hand on top and follow the shaft down with a finger. Don't let the pinion gear rotate out of place, and sometimes there is a washer that will fall out when you pull the shaft out. It is easier if you have a helper. Once the shaft is past the end of the axle have your helper push the axle in and you can take off the c shaped retainer and the axle will pull out. Hint don't let the axle drag on the seal at the outer end of the housing or you may have a leak. If you are going that far new seals would be a good idea and lube them so they wont run dry ay first.

If you take the shaft all the way out put a small dowell, screwdriver or something in the holes to keep the gears and washers from falling out. You can use your finfer in the hole to get them lined up so you can start the shaft back in.

If anyone knows if this differential is similar in design to a Blazer I have a 1995 factory service manual. I could fax some copies to you.
 
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Old 01-18-05, 05:27 AM
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That pretty well says it all. You do need to determine if this is a limitted slip that is chattering around corners. That would be a very common thing as CarNut touched on.
 
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Old 01-18-05, 05:38 AM
JCJC
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Will check to see what type of rear it is. However clunking is not always when turning. It is also happening when driving straight.
 
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Old 01-19-05, 08:30 AM
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Trying to help,

you have checked the driveshaft's u-joints for wear....especially if you hear this noise when you speed up or slow down?
 
  #11  
Old 01-19-05, 01:54 PM
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Originally Posted by JCJC
Will check to see what type of rear it is. However clunking is not always when turning. It is also happening when driving straight.
It's possible you chipped a tooth off the ring gear too.
 
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Old 01-22-05, 11:04 AM
JCJC
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Waiting for the strom to pass. should get about 2 feet of snow this weekend. Hopefully I will get a chance to check it out within the next week or so. I will let everyone know the outcome.

Thanks for all the input.

KC
 
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