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79 - Rear end differential cover cracked

Old 08-25-2018, 10:10 AM
  #21  
Lagonia
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I decided to rebuild mine for training. I will be replacing bearings and seals and go through the rebuild process. I am not replacing any internals. Got the parts in - next is sandblasting, priming and painting the pumpkin and new cover.
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Old 08-26-2018, 12:33 PM
  #22  
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The case is ready:
- Cleaned it in a hot aqueous parts cleaner
- Dulled all the internal sharp edges and chased on the threads
- Sandblasted it
- Cleaned it again in the parts cleaner
- 3 coats of epoxy primer
- 3 coats of engine enamel



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Old 08-26-2018, 05:11 PM
  #23  
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Carrier assembly next - all internal parts are cleaned:

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Old 09-02-2018, 02:20 PM
  #24  
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Well, I ran into a problem right off the bat. I cannot install the inner pinion bearing race. I had such a hard time attempting to taking the old one out I had to cut it out. Putting the new one in was a no go - mind you, I have done bearing race replacement countless times - there seems to be an issue with the case.

I used my micrometer to get some measurements. The outer race diameter is exactly 3.2500" and the race hole is about 3.2443" giving an interference fit of 0.0057" which I think is too high - I would expect something in the neighborhood of 0.001 / 0.002. My options are to bore the race hole out another 2 - 4 thou. Don't have a mill but may be that's the excuse I need to get one....

So, I am putting this on hold and turning my attention to the trailing arms. I need to rebuild them - but first - remove them - in a different thread.


Last edited by Lagonia; 09-02-2018 at 02:27 PM. Reason: Spelling
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Old 09-15-2018, 01:35 PM
  #25  
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The last two weeks I was trying to get another core to rebuild using Craigslist and eBay - I located 3 of them, one $350 that the seller could not get off the car due to rain storms the last two weeks, another one for $490 and one for $1000(!) - what tha!! - talking about used, unknown quantity units that have been in carcasses (literally!) for years in fields.

I kept working the original case carefully sanding and inspecting the bore and finally(!) I was able to install the pinion inner bearing race! This project is back on.





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Old 09-15-2018, 01:49 PM
  #26  
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I hadn't clicked on this thread in the past, but am glad I did. I too have a 79, and my diff needs attention. I've looked at all your pics, and read all of Gary's advice, as i know he's the expert. I'll continue to keep up and watch your progress. I wish I had a shop as well equipped as you!
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Old 09-15-2018, 05:58 PM
  #27  
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Posi-carrier is assembled - clutchpack, pinion gears, spider gears, springs - next the ring gear and then start measuring schtuff.









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Old 09-15-2018, 06:03 PM
  #28  
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Chase the threads where the crossmember bolts on to the frame . Just had mine out.

Last edited by croaker; 09-15-2018 at 06:04 PM.
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Old 09-15-2018, 07:46 PM
  #29  
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Ring gear installed - ARP bolts, red locktite - torqued to 30 - 45 - 60lbs (final) in a criss-cross patern



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