12 bolt rear end carrier assy. Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dennis7222 · 03-09-2016, 02:53 PM

Will the positraction unit out of a 1965 - 12 bolt truck rear end, fit a 1972 - 12 bolt truck rear end? Thanks, Dennis

Willie Makeit · 03-09-2016, 03:09 PM

I don't think the spline count for the axles is the same.

**uncle** · 03-09-2016, 05:52 PM

It will if fine spline.

Mike C · 03-09-2016, 09:12 PM

It should be fine. To my knowledge the 12 bolts were always 30 spline. But it must be for the same series gear as the one you are going from and to.

snipescastle2 · 03-11-2016, 10:40 PM

I found a 1964 C 10, 12 bolt posi rear end, physically,identical, but two exceptions: 17 spline axles and the posi unit was rare, made by "Dana" the only other Chevy to use this carrier was the 64 Corvette. I was looking forever for rebuild parts for this carrier, but every place I called said no one makes parts for these anymore, even "Randy's Ring and Pinion" etc...
But, Corvette restoration companies do have clutch kits for the 64 model unit. The second exception is the track bar mount is an ugly sheet metal bracket welded to the axle tube, -vs. Center of the housing.but, everything else bolts right up, even the ring and pinion...bearings...etc.
Hth,
Ben

03-09-2016, 02:53 PM	#1
dennis7222 Registered User Join Date: Jan 2014 Location: Roachdale IN Posts: 51	12 bolt rear end carrier assy. Question Will the positraction unit out of a 1965 - 12 bolt truck rear end, fit a 1972 - 12 bolt truck rear end? Thanks, Dennis

03-09-2016, 03:09 PM	#2
Willie Makeit Registered User Join Date: Oct 2013 Location: Alabama Posts: 1,211	Re: 12 bolt rear end carrier assy. Question I don't think the spline count for the axles is the same.

03-09-2016, 05:52 PM	#3
uncle Senior Member Join Date: Aug 2003 Location: Conyers,Ga. Posts: 7,286	Re: 12 bolt rear end carrier assy. Question It will if fine spline.

03-09-2016, 09:12 PM	#4
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,715	Re: 12 bolt rear end carrier assy. Question It should be fine. To my knowledge the 12 bolts were always 30 spline. But it must be for the same series gear as the one you are going from and to. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

03-11-2016, 10:40 PM	#5
snipescastle2 Registered User Join Date: Mar 2009 Location: WARRENSBURG,MISSOURI,64093 Posts: 1,518	Re: 12 bolt rear end carrier assy. Question I found a 1964 C 10, 12 bolt posi rear end, physically,identical, but two exceptions: 17 spline axles and the posi unit was rare, made by "Dana" the only other Chevy to use this carrier was the 64 Corvette. I was looking forever for rebuild parts for this carrier, but every place I called said no one makes parts for these anymore, even "Randy's Ring and Pinion" etc... But, Corvette restoration companies do have clutch kits for the 64 model unit. The second exception is the track bar mount is an ugly sheet metal bracket welded to the axle tube, -vs. Center of the housing.but, everything else bolts right up, even the ring and pinion...bearings...etc. Hth, Ben



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