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ZONE 4.25" combo lift for TJ available at Rockridge4wNEW!! HMF 50"-52" light bar mounting brackets!! ROCK BOTTOM prices on LIFT KITS at Rockridge4wd!! WANT TO

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Unread 03-24-2004, 07:39 PM   #1
JERSEYJOE
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Damaged threads

Believe it or not, I damaged the threads on my AMC 20 pinion gear during disassembly. It's amazing how removing a nut can damage threads but it happened.

Q U E S T I O N: DOES ANYONE KNOW THE DIAMETER AND THREAD PITCH SO THAT I CAN FIND A DIE TO FIX THESE THREADS?

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Unread 03-24-2004, 07:45 PM   #2
skip3
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I may be able to find that out tomorrow - will let you know.

When you go to put that thing back together, do you have any specs or instructions for doing so? I lost my book and am so far stuck with a pile of parts for my '85 CJ7.
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Unread 03-24-2004, 08:11 PM   #3
JERSEYJOE
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Yes I can fax you a copy of the AMC repair manual for rebuilding the diff. My CJ project is in a million pieces also, but hopefully it will be a rolling chassis in 30 days
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Unread 03-25-2004, 11:19 AM   #4
skip3
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Quote:
Originally Posted by Jersey Joe
Believe it or not, I damaged the threads on my AMC 20 pinion gear during disassembly. It's amazing how removing a nut can damage threads but it happened.

Q U E S T I O N: DOES ANYONE KNOW THE DIAMETER AND THREAD PITCH SO THAT I CAN FIND A DIE TO FIX THESE THREADS?
After careful measuring and calculation, it appears that the pinion threads are 7/8-20 UNEF (Unified, Extra Fine). Am on my way to parts store to buy a pinion nut (I damaged the outer threads by pounding on it to remove outer pinion bearing), and will verify.

I am trying to find a fax number I can use to receive your specs. You don't happen to have a scanner, so you?
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Unread 03-25-2004, 02:56 PM   #5
JERSEYJOE
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Specs

Quote:
Originally Posted by skip3
After careful measuring and calculation, it appears that the pinion threads are 7/8-20 UNEF (Unified, Extra Fine). Am on my way to parts store to buy a pinion nut (I damaged the outer threads by pounding on it to remove outer pinion bearing), and will verify.

I am trying to find a fax number I can use to receive your specs. You don't happen to have a scanner, so you?

No scanner, but let me think of someone who may
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Unread 03-25-2004, 05:28 PM   #6
motoxxxguy
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Most office supply stores can scan files for you. Hell, you might be able to fax them a copy, have them scan it, then email it back to you without you ever leaving the house. It's worth a try to call a few and ask.

-moto
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Unread 03-25-2004, 06:04 PM   #7
skip3
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I went to the library, the O'Reilly's, and the Jeep dealership, and none had any information on the thread size. I've measured many threads over the years, and I checked the dimensions in Machinery handbook, so I'm confident of the 7/8-20.

Don't worry about the fax - I think I've found enough specs to do what I need.

Every book I've read about this said to use a new pinion nut when reassembling. The guys at the dealership said they just use the old nut over again. (Is that a scary thought?) A new one will cost $11.25. I also need a new yoke - dealer cost $94.50. Sheesh. I told them I'd think about it, and ran home. Found the parts in 4WheelDrive catalog, at $32.95 for the yoke and $4.99 for the nut, which comes with a new seal. Tax, shipping, handling, bribes, and everything altogether is less than $50. Will be here Wednesday.

By the way, I got the old style yoke, with u-bolts instead of straps, since that's a much stronger design.

Enough of this rambling. Good luck with your project.
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Unread 03-25-2004, 06:09 PM   #8
motoxxxguy
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I've always reused the pinion nut one time before replacing it. Just put some locktite on it and you'll be fine.

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Unread 03-25-2004, 06:17 PM   #9
skip3
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I've re-used it too, when changing out pinion seals. Unfortunately, I used the nut to bang on when I was separating the pinion shaft and rear bearing, and the last 2 or 3 threads got kinda bent.
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Unread 03-25-2004, 09:29 PM   #10
JERSEYJOE
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Quote:
Originally Posted by skip3
I've re-used it too, when changing out pinion seals. Unfortunately, I used the nut to bang on when I was separating the pinion shaft and rear bearing, and the last 2 or 3 threads got kinda bent.


Mine got damaged while unscrewing it!!! This is almost too strange to believe. In the past i have crossed threaded bolts and damaged the threads, but this happened coming apart. The other way this happens is when you are trying to beat the pinion out of the housing. Even with a press, sometimes the end will mushroom

Talked to a guy at the tool shop. A 7/8 -20 die will set me back $37.00. Oh well I'll have it anyone ever needs it.

Jersey
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Unread 03-26-2004, 06:48 AM   #11
fuzz401
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i might have a old yoke and a new pinion nut have to look
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Unread 03-26-2004, 11:00 PM   #12
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I use a brass punch to drive my pinion out. No problems with buggered up threads.
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