Need help identifying my differential - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Snifflez · 07-11-2020, 12:23 AM

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.

**68350** · 07-11-2020, 07:18 AM

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

**68350** · 07-11-2020, 07:20 AM

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

**Jason Banks** · 07-11-2020, 09:14 AM

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.

gmc684x4 · 07-11-2020, 10:36 AM

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

Snifflez · 07-11-2020, 11:13 PM

Did some looking around and I found these numbers.

**LockDoc** · 07-11-2020, 11:33 PM

Quote:

Originally Posted by Snifflez

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

LockDoc

Snifflez · 07-12-2020, 12:59 AM

Okay well I don't know if this rear end is from 67,68 or 69

**Ironangel** · 07-12-2020, 07:48 AM

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...

gmc684x4 · 07-12-2020, 12:02 PM

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

**LockDoc** · 07-12-2020, 04:31 PM

Quote:

Originally Posted by Snifflez

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.

LockDoc

07-11-2020, 12:23 AM	#1
Snifflez Registered User Join Date: Sep 2018 Location: Albuquerque Posts: 9	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. Attached Images

07-11-2020, 07:18 AM	#2
68350 Senior Member Join Date: Jan 2002 Location: Williston, ND Posts: 2,999	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

07-11-2020, 07:20 AM	#3
68350 Senior Member Join Date: Jan 2002 Location: Williston, ND Posts: 2,999	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

07-11-2020, 09:14 AM	#4
Jason Banks Senior Member Join Date: Dec 1999 Location: TX Posts: 1,624	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.

07-11-2020, 10:36 AM	#5
gmc684x4 Registered User Join Date: Jul 2012 Location: Whitehorse yukon Posts: 1,218	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 Attached Images

07-11-2020, 11:13 PM	#6
Snifflez Registered User Join Date: Sep 2018 Location: Albuquerque Posts: 9	Re: Need help identifying my differential Did some looking around and I found these numbers. Attached Images

07-12-2020, 12:59 AM	#8
Snifflez Registered User Join Date: Sep 2018 Location: Albuquerque Posts: 9	Re: Need help identifying my differential Okay well I don't know if this rear end is from 67,68 or 69

07-12-2020, 07:48 AM	#9
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	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"

07-12-2020, 12:02 PM	#10
gmc684x4 Registered User Join Date: Jul 2012 Location: Whitehorse yukon Posts: 1,218	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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