ring gear differential screw size

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ring gear differential screw size

Postby jean marie » Wed Jun 06, 2012 3:27 pm

Hi all

I am planning to replace the bolts holding the differential ring gear to the differential case and would like to order the screws before opening the differential cases.
But I cannot find the size-lenght-thread of those bolts in the TM or spare parts lists neither in Claude pons' bolts list.
If anybody can help? Thanks
I guess it is 3/8'' - 24 X 7/8" ???

Why do I want to replace these bolts?
I have seen several recent problems with broken bolt heads ending in the differential case. :|
Jean Marie
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Re: ring gear differential screw size

Postby Ben Dover » Wed Jun 06, 2012 7:37 pm

Best buy original type as the Ring Gear attaching bolts are not the hardware store variety. The A-871 Screw is 3/8"-24 X 7/8" and has a special hardness and head. The 4 Lock Straps are A-792.
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Re: ring gear differential screw size

Postby jean marie » Thu Jun 07, 2012 1:03 am

Thanks Ben, This I did not know. I will try Ron.
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Re: ring gear differential screw size

Postby Ben Dover » Thu Jun 07, 2012 7:38 am

Let me know how you make out with Ron.
PROUD 2011 MVPA PIONEER AWARDEE-HONOR GRAD WHEELED VEHICLE MECHANIC SCHOOL 1960- US ARMY ORDNANCE SCHOOL(MACHINIST) APG 1962 - O-1 BIRD DOG CREWCHIEF - 68 NONSTOP BY THE BOOK ARMY TRUCK-JEEP YEARS LIFETIME AM LEGION DAV 40/8- MVPA 1064 -7 TURNKEY MV'S
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Re: ring gear differential screw size

Postby V-Twin-Indian » Thu Jun 07, 2012 1:42 pm

If Ron does not have them here is a link for a near exact match:

http://www.diffsonly.com/yspblt-008-ring-gear-bolt-for-model-35-dana-25-27-30-44-3-8-x-24/

I used these and was pleased.
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Re: ring gear differential screw size

Postby Ben Dover » Thu Jun 07, 2012 3:47 pm

Too short, OEM A-871 is 7/8", the replacements on that site are 3/4" long.
PROUD 2011 MVPA PIONEER AWARDEE-HONOR GRAD WHEELED VEHICLE MECHANIC SCHOOL 1960- US ARMY ORDNANCE SCHOOL(MACHINIST) APG 1962 - O-1 BIRD DOG CREWCHIEF - 68 NONSTOP BY THE BOOK ARMY TRUCK-JEEP YEARS LIFETIME AM LEGION DAV 40/8- MVPA 1064 -7 TURNKEY MV'S
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Re: ring gear differential screw size

Postby jean marie » Sat Jun 09, 2012 7:01 am

I ended by opening the thing this afternoon, everything inside is ford original and I was happy to find that everything is in perfect shape, even no sign of wear on the pinions, no play. I'm lucky lol:
A new seal and gear oil and on the road.
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Re: ring gear differential screw size

Postby Ben Dover » Sat Jun 09, 2012 7:04 am

Did you find the screws you were looking for?
PROUD 2011 MVPA PIONEER AWARDEE-HONOR GRAD WHEELED VEHICLE MECHANIC SCHOOL 1960- US ARMY ORDNANCE SCHOOL(MACHINIST) APG 1962 - O-1 BIRD DOG CREWCHIEF - 68 NONSTOP BY THE BOOK ARMY TRUCK-JEEP YEARS LIFETIME AM LEGION DAV 40/8- MVPA 1064 -7 TURNKEY MV'S
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Re: ring gear differential screw size

Postby jean marie » Sat Jun 09, 2012 9:53 am

Yes Ben I will get the screws from a french army stock surplus but will leave the original F screws on the jeep as they do not show any wear.
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Re: ring gear differential screw size

Postby Ben Dover » Sat Jun 09, 2012 12:12 pm

Sounds good. I have a few that I could spare.
PROUD 2011 MVPA PIONEER AWARDEE-HONOR GRAD WHEELED VEHICLE MECHANIC SCHOOL 1960- US ARMY ORDNANCE SCHOOL(MACHINIST) APG 1962 - O-1 BIRD DOG CREWCHIEF - 68 NONSTOP BY THE BOOK ARMY TRUCK-JEEP YEARS LIFETIME AM LEGION DAV 40/8- MVPA 1064 -7 TURNKEY MV'S
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