differential rebuild?
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
differential rebuild?
I am doing a frame off. My differential seemed to be working just fine when I started this restoration. I have been trying to make up my mind for 2 weeks whether or not I should rebuild it or not. Looks like a good rebuild cost over $1,000! Money for this project is starting to get tight.
Anyway, this morning I realized that I don't have to rebuild it if it isn't that difficult to get out later,,,if I ever need to.
So the question is Is it difficult to pull the differential after the car is back together? Looks to me like it could be done in 2hrs. If so then I'll just change the fluid, paint the case and put it back. Maybe new seals.
Any advice guys?
Anyway, this morning I realized that I don't have to rebuild it if it isn't that difficult to get out later,,,if I ever need to.
So the question is Is it difficult to pull the differential after the car is back together? Looks to me like it could be done in 2hrs. If so then I'll just change the fluid, paint the case and put it back. Maybe new seals.
Any advice guys?
Le Mans Master
Joined: Jan 2000
Posts: 8,918
Likes: 27
From: New Hill NC
I am doing a frame off. My differential seemed to be working just fine when I started this restoration. I have been trying to make up my mind for 2 weeks whether or not I should rebuild it or not. Looks like a good rebuild cost over $1,000! Money for this project is starting to get tight.
Anyway, this morning I realized that I don't have to rebuild it if it isn't that difficult to get out later,,,if I ever need to.
So the question is Is it difficult to pull the differential after the car is back together? Looks to me like it could be done in 2hrs. If so then I'll just change the fluid, paint the case and put it back. Maybe new seals.
Any advice guys?
Anyway, this morning I realized that I don't have to rebuild it if it isn't that difficult to get out later,,,if I ever need to.
So the question is Is it difficult to pull the differential after the car is back together? Looks to me like it could be done in 2hrs. If so then I'll just change the fluid, paint the case and put it back. Maybe new seals.
Any advice guys?
Gears are designed for infinite use. If there is nothing wrong with it, then leave it alone. Clean it up and change the seals while it is out. Also change the fluid and additive. You are correct, the rear can be easily serviced if it is needed later.
Melting Slicks
Joined: Dec 2000
Posts: 3,363
Likes: 303
From: Lansdale 19446 PA
2024 C3 of the Year Finalist- Unmodified
St. Jude Donor '10-'11, '15, '19
With above advice. Shouldn't take much more then an hour to remove. Biggest issue I had (on all 3) was the crossmember. If you've had that out, the next time should be a piece of cake.You didn't memtion the mileage but the posi unit in my 76 blew at 131K. I think Bair's does rebuild at $565 plus any additional hard parts.
Yeah - replace the fluids, paint it & put it back.
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
Diff. end play .017 and .028
I appreciate the comments. I found a wa y to measure the end play. one side is .017 the other .028. So one is above the .020. But I assume this is a reference? Either way, I'm thinking its a safe bet to move forward and NOT do the rebuild.
Agree/disagree?
Agree/disagree?
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
With above advice. Shouldn't take much more then an hour to remove. Biggest issue I had (on all 3) was the crossmember. If you've had that out, the next time should be a piece of cake.You didn't memtion the mileage but the posi unit in my 76 blew at 131K. I think Bair's does rebuild at $565 plus any additional hard parts.
Yeah - replace the fluids, paint it & put it back.
Drifting
Joined: Oct 2007
Posts: 1,458
Likes: 1
From: Collinsville MS
St. Jude Donor '08
Here is some advice Gary gave me when I was doing mine:
Check the endplay in the yokes. If over .040" remove them to inspect.
With the cover off, use a 90* pr of snap ring pliers and remove the snap rings from the yoke. Pull the yokes out and install the snap rings back. Then measure from the face to the ring should be in the .180-.187 range. If you find it less then .170 I would replace them, but keep in mind that the posi is probably sloppy too so even if you replace the yokes you may still have over .030 endplay. end quote
I ended up replacing the seals and both of my yokes and that cured it.
Check the endplay in the yokes. If over .040" remove them to inspect.
With the cover off, use a 90* pr of snap ring pliers and remove the snap rings from the yoke. Pull the yokes out and install the snap rings back. Then measure from the face to the ring should be in the .180-.187 range. If you find it less then .170 I would replace them, but keep in mind that the posi is probably sloppy too so even if you replace the yokes you may still have over .030 endplay. end quote
I ended up replacing the seals and both of my yokes and that cured it.
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
Here is some advice Gary gave me when I was doing mine:
Check the endplay in the yokes. If over .040" remove them to inspect.
With the cover off, use a 90* pr of snap ring pliers and remove the snap rings from the yoke. Pull the yokes out and install the snap rings back. Then measure from the face to the ring should be in the .180-.187 range. If you find it less then .170 I would replace them, but keep in mind that the posi is probably sloppy too so even if you replace the yokes you may still have over .030 endplay. end quote
I ended up replacing the seals and both of my yokes and that cured it.
Check the endplay in the yokes. If over .040" remove them to inspect.
With the cover off, use a 90* pr of snap ring pliers and remove the snap rings from the yoke. Pull the yokes out and install the snap rings back. Then measure from the face to the ring should be in the .180-.187 range. If you find it less then .170 I would replace them, but keep in mind that the posi is probably sloppy too so even if you replace the yokes you may still have over .030 endplay. end quote
I ended up replacing the seals and both of my yokes and that cured it.
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Verdad Gallardo
Tech Contributor
Joined: Aug 1999
Posts: 15,176
Likes: 3,991
From: Connecticut, USA
If your endplay is what you say then you're ok. The 68 will have the weaker posi case and spiders and the better clutches.
If you had no issues, then pull the cover and clean the posi case. If there are no cracks in the window or side holes,drive it. If you see any cracks pull it out, replace the case and rebuild it.
You can a basic rebuild(little parts beside a master kit included) for $600-$800 from most places, the better jobs are double that easy.
If you had no issues, then pull the cover and clean the posi case. If there are no cracks in the window or side holes,drive it. If you see any cracks pull it out, replace the case and rebuild it.
You can a basic rebuild(little parts beside a master kit included) for $600-$800 from most places, the better jobs are double that easy.
