12 bolt rear from 77 3/4 ton truck - The 1947 - Present Chevrolet & GMC Truck Message Board Network

onelow69 · 02-20-2003, 12:56 AM

This is the question's that I have. 1. Can a 1977 3/4 ton 12bolt go in a 69 1/2 ton. I know that the housing is wider and it is 5 lug and the brakes are bigger 2 1/2in instead of 2in wide.
2. Is the width the same as 71-72 trucks. Because I want the wider housing so I can have the right backspacing for the rear wheels.
3. Who makes housing pads that I can weld on. And I know that I would have to cut and grind the shock brakets off and old spring perches.
4. Would I have to change the P-Valve. Because I already changed the front to disc brakes and have the right P-Valve for the set-up that I have.
5. Will the emergencey brake cables work from that rear to my stock set-up.
If there is anything missing please infourm me, because I have a chance to get this rear end for 25$ and Its in great shape.
Thanks onelow69

crazy longhorn · 02-20-2003, 01:08 AM

I have a 75 12bolt(1/2 ton diff) under my longhorn, & as far as width it fits fine. I dont think you will have any trouble with the prop valve, as the brakes are the same size. If you have coils, ther is a kit to install the later diff... http://www.classicperform.com/produc...ersion-Kit.htm good luck,crazyL

02-20-2003, 12:56 AM	#1
onelow69 Registered User Join Date: Jan 2003 Location: Central Cal Posts: 124	12 bolt rear from 77 3/4 ton truck This is the question's that I have. 1. Can a 1977 3/4 ton 12bolt go in a 69 1/2 ton. I know that the housing is wider and it is 5 lug and the brakes are bigger 2 1/2in instead of 2in wide. 2. Is the width the same as 71-72 trucks. Because I want the wider housing so I can have the right backspacing for the rear wheels. 3. Who makes housing pads that I can weld on. And I know that I would have to cut and grind the shock brakets off and old spring perches. 4. Would I have to change the P-Valve. Because I already changed the front to disc brakes and have the right P-Valve for the set-up that I have. 5. Will the emergencey brake cables work from that rear to my stock set-up. If there is anything missing please infourm me, because I have a chance to get this rear end for 25$ and Its in great shape. Thanks onelow69 __________________ 69 Chevy Truck, 350, 400trans, Lowered 3.5/6, Disc brake conv, All early classic stuff. 62 Chevy Nova 350, 700R4, 2400stall, F9in, 3.70gear, AlburnPosi, Chevelle Disc Brakes, ect.

02-20-2003, 01:08 AM	#2
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	I have a 75 12bolt(1/2 ton diff) under my longhorn, & as far as width it fits fine. I dont think you will have any trouble with the prop valve, as the brakes are the same size. If you have coils, ther is a kit to install the later diff... http://www.classicperform.com/produc...ersion-Kit.htm good luck,crazyL __________________ 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....



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