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#1 |
Registered User
Join Date: Sep 2018
Location: Albuquerque
Posts: 9
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Need help identifying my differential
This is the differential I have on my 67 C10. I want to swap in some 5x5 axles and do a disc brake conversion. If have any axle recommendation they will be greatly appreciated.
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#2 |
Senior Member
![]() Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
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Re: Need help identifying my differential
When i converted my 68 to 5 lug, I bought an axle kit to do the conversion from Moser. I wanna say it was a couple hundred for the new 5 lug axles and they slid right in with no issues
__________________
68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi |
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#3 |
Senior Member
![]() Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
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Re: Need help identifying my differential
Here is a link to the axles. I would shop around and see if you can find them cheaper than this link
https://azproperformance.com/product...xles-65-70-c10
__________________
68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi |
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#4 |
Senior Member
![]() Join Date: Dec 1999
Location: TX
Posts: 1,569
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Re: Need help identifying my differential
Here is a cheaper axle. I'm sure it's not as good as the Moser 68350 linked.
https://www.summitracing.com/parts/mgr-mg6569 These are what I ordered and when I was installing them I noticed they were made in India. Which, in my mind having seen other metal parts from India, makes me think they may not be the highest quality. All machining looked nice though. |
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#5 |
Registered User
Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 1,218
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Re: Need help identifying my differential
I would look up axle code or pull the axles and measure them
Some time around 70 71 gm started putting wider axles in these trucks looks like a 12 bolt can not see the whole cover count how many bolts in the cover should be 12 bolts |
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#6 |
Registered User
Join Date: Sep 2018
Location: Albuquerque
Posts: 9
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Re: Need help identifying my differential
Did some looking around and I found these numbers.
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#7 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,487
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Re: Need help identifying my differential
Go to this thread and look it up. First 2 letters....
https://www.67-72chevytrucks.com/vbo...d.php?t=578793 LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#8 |
Registered User
Join Date: Sep 2018
Location: Albuquerque
Posts: 9
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Re: Need help identifying my differential
Okay well I don't know if this rear end is from 67,68 or 69
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#9 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Need help identifying my differential
The HA indicates it's a 3:73 gear. G is Chevy Gear and Axle, The 9 is the ninth day of the year and the 3 would be third shift. It is a GM Truck 12-Bolt that can be from 67-68 or 69...Might be a date stamped on the ring gear...That's not a factory panhard bar so it wouldn't be to surprising to find that the gear set has been changed and if your lucky you'll find a positrac has been installed. You wont know for sure unless you remove the cover and look at the stamped numbers on the edge of the ring gear. Judging from the crusty build up it's leaked a bit so it's a good idea to open it up and inspect it. You'll need a Fel-Pro #RDS13391 cover gasket for the GM 12T (Truck 12-bolt) and two quarts of MP SAE80w-90 gear lube. Any good synthetic will do nicely unless it's a positrac. A Posi requires 4 oz. of ACDelco LS Additive #88900330...
__________________
Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#10 |
Registered User
Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 1,218
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Re: Need help identifying my differential
That is good now you know you need a set of 60 to 69 5 bolt axles to fit your diff to convert it
Captain fab on here makes brackets and has a parts store list of items http://67-72chevytrucks.com/vboard/s...d.php?t=398352 |
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#11 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,487
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Re: Need help identifying my differential
It doesn't make a difference. "HA" in all three years is a 3.73 and the housings are all the same. I think the only difference would be if it was a leaf spring or coil spring. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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