suggested to do a writeup for here like this also - The 1947 - Present Chevrolet & GMC Truck Message Board Network

creepdogg · 10-17-2011, 10:08 PM

I know theres about a million threads about this, hell I have just read about 30 or so, but cant seem to figure it out, I am powdering my rear, swapping from 6 lugs to 5 and installing a stock 71 c10 posi unit into this rear.

Originally its out of my 1970 c10 coil 2wd 6 cylinder truck, running 3.73 gears, I want to replace all the bearings as well as seals.

Can someone help

tks

gcburdic · 10-17-2011, 11:03 PM

I don't understand your question....sounds like you have a 70 rear end and you want to install 5 lug axles??...Is that correct? I'm sure others know, but to my understanding the 70 axle housings could be either a narrow or wider housing pending on its production date....the 67-70(early) were approximately 3/4" per side or 1.5" narrower than the 70(late)-72 rear ends....if by chance you have the later rear, you maybe able to swap in axles from a 71/72 truck or buy the ECE conversion axles or check with Moser(?)

So...please measure from backing plate to backing plate....this will help determine

creepdogg · 10-17-2011, 11:31 PM

Quote:

Originally Posted by gcburdic

I don't understand your question....sounds like you have a 70 rear end and you want to install 5 lug axles??...Is that correct? I'm sure others know, but to my understanding the 70 axle housings could be either a narrow or wider housing pending on its production date....the 67-70(early) were approximately 3/4" per side or 1.5" narrower than the 70(late)-72 rear ends....if by chance you have the later rear, you maybe able to swap in axles from a 71/72 truck or buy the ECE conversion axles or check with Moser(?)

So...please measure from backing plate to backing plate....this will help determine

Wow! How I messed that up, I need to know if it is a Dana rear or a HO35. When buying bearings for the rear axles and diff carrier I get lots of options regarding Dana rear ends and HO33,35. I am not sure what one I have?

Thanks

crazy longhorn · 10-18-2011, 12:43 AM

GM 12 bolt truck...

Mike Bradbury · 10-18-2011, 01:16 AM

longhorn got it but this might help explain the difference for you.

http://coloradok5.com/axleguide.shtml

creepdogg · 10-18-2011, 09:06 AM

Thanks guys, so its def not a Dana rear, tks

gcburdic · 10-18-2011, 09:24 AM

nope...looks like a....

GM CORPORATE 12-BOLT
The stronger 12-bolt, with an 8 7/8-inch-diameter ring gear, can be found in various 1964-82 GM 1/2- and 3/4-ton rearends.

10-17-2011, 10:08 PM	#1
creepdogg Registered User Join Date: Jul 2011 Location: Ann Arbor Posts: 453	suggested to do a writeup for here like this also I know theres about a million threads about this, hell I have just read about 30 or so, but cant seem to figure it out, I am powdering my rear, swapping from 6 lugs to 5 and installing a stock 71 c10 posi unit into this rear. Originally its out of my 1970 c10 coil 2wd 6 cylinder truck, running 3.73 gears, I want to replace all the bearings as well as seals. Can someone help tks Attached Images

10-17-2011, 11:03 PM	#2
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: Help me identify my rear I don't understand your question....sounds like you have a 70 rear end and you want to install 5 lug axles??...Is that correct? I'm sure others know, but to my understanding the 70 axle housings could be either a narrow or wider housing pending on its production date....the 67-70(early) were approximately 3/4" per side or 1.5" narrower than the 70(late)-72 rear ends....if by chance you have the later rear, you maybe able to swap in axles from a 71/72 truck or buy the ECE conversion axles or check with Moser(?) So...please measure from backing plate to backing plate....this will help determine __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present

10-18-2011, 12:43 AM	#4
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Re: Help me identify my rear GM 12 bolt truck... __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

10-18-2011, 01:16 AM	#5
Mike Bradbury Registered User Join Date: Apr 2008 Location: San Diego California Posts: 1,316	Re: Help me identify my rear longhorn got it but this might help explain the difference for you. http://coloradok5.com/axleguide.shtml __________________ I'd rather attempt something great and fail.. than try something ordinary and succeed. Norman Vincent Peale Project: Barn Raising http://67-72chevytrucks.com/vboard/s...d.php?t=414961 Project: 30 Be Low https://67-72chevytrucks.com/vboard/...d.php?t=830583

10-18-2011, 09:06 AM	#6
creepdogg Registered User Join Date: Jul 2011 Location: Ann Arbor Posts: 453	Re: Help me identify my rear Thanks guys, so its def not a Dana rear, tks

10-18-2011, 09:24 AM	#7
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: Help me identify my rear nope...looks like a.... GM CORPORATE 12-BOLT The stronger 12-bolt, with an 8 7/8-inch-diameter ring gear, can be found in various 1964-82 GM 1/2- and 3/4-ton rearends. __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present



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