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Old 07-11-2020, 12:23 AM   #1
Snifflez
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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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Old 07-11-2020, 07:18 AM   #2
68350
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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
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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
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71 Chevy Blazer, CST, 350/auto
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71 Custom/30, Open Road, 350/th400, tilt
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Old 07-11-2020, 07:20 AM   #3
68350
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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
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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 Custom Deluxe/10, 350, 4 speed
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
71 Chevy Cheyenne/20, 402/4 speed, tool and stowage
72 Chevy K20, 350, 4 speed, tow hooks
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
72 GMC Sierra Grande Longhorn 2500. 402/th400, a/c, tool and stowage
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Old 07-11-2020, 09:14 AM   #4
Jason Banks
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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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Old 07-11-2020, 10:36 AM   #5
gmc684x4
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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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Old 07-11-2020, 11:13 PM   #6
Snifflez
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Re: Need help identifying my differential

Did some looking around and I found these numbers.
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Old 07-11-2020, 11:33 PM   #7
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Re: Need help identifying my differential

Quote:
Originally Posted by Snifflez View Post
Did some looking around and I found these numbers.
Go to this thread and look it up. First 2 letters....

https://www.67-72chevytrucks.com/vbo...d.php?t=578793

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Old 07-12-2020, 12:59 AM   #8
Snifflez
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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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Old 07-12-2020, 07:48 AM   #9
Ironangel
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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...
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Old 07-12-2020, 12:02 PM   #10
gmc684x4
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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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Old 07-12-2020, 04:31 PM   #11
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Re: Need help identifying my differential

Quote:
Originally Posted by Snifflez View Post
Okay well I don't know if this rear end is from 67,68 or 69

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.

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