My 77 GMC 4x4 needs a new rear axle. 12 bolt? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Triple6Goat · 07-23-2013, 08:09 AM

Hey guys,

It's been a while since I have been on here since I sold my 62 pickup. I recently bought a "project" 77 GMC 4x4 that wasn't intended to be a project. It currently has a 2005ish MY 1500 pickup rear end in it with disc brakes, a bent axle shaft and no e-brake. I have a Dana 44 in the front and I want to put a better rear end in it like a 12 bolt or 10 bolt and have been trying to research what years have a bolt in and go 12 or 10 bolt rear end does 64-82 k10 sound right?

If it makes any difference I am running 35" tires and don't plan on doing any extreme off roading.
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79Betty · 07-23-2013, 09:23 AM

I pulled a 12 bolt outta a 85 blazer to try n see how 3.08's worked (bad idea!) and it bolted right in. I did have to turn my lift blocks around because of the perch angle but other wise no problems. I'd say 73-87 sice they were all "basically" the same underneath.
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07-23-2013, 08:09 AM	#1
Triple6Goat Registered User Join Date: Jul 2009 Location: panama city beach, FL Posts: 59	My 77 GMC 4x4 needs a new rear axle. 12 bolt? Hey guys, It's been a while since I have been on here since I sold my 62 pickup. I recently bought a "project" 77 GMC 4x4 that wasn't intended to be a project. It currently has a 2005ish MY 1500 pickup rear end in it with disc brakes, a bent axle shaft and no e-brake. I have a Dana 44 in the front and I want to put a better rear end in it like a 12 bolt or 10 bolt and have been trying to research what years have a bolt in and go 12 or 10 bolt rear end does 64-82 k10 sound right? If it makes any difference I am running 35" tires and don't plan on doing any extreme off roading. Posted via Mobile Device __________________ 1984 C10 swb 1985 K20 longbed 4spd 1977 K10 longbed -SOLD 1962 Chevrolet C10 swb 6cyl. 3spd. -SOLD

07-23-2013, 09:23 AM	#2
79Betty Registered User Join Date: Jan 2013 Location: Jasper, IN Posts: 948	Re: My 77 GMC 4x4 needs a new rear axle. 12 bolt? I pulled a 12 bolt outta a 85 blazer to try n see how 3.08's worked (bad idea!) and it bolted right in. I did have to turn my lift blocks around because of the perch angle but other wise no problems. I'd say 73-87 sice they were all "basically" the same underneath. Posted via Mobile Device __________________ When in doubt, throttle it out! 1974 Chevrolet Custom K20 2005 Ford Ranger Edge 1985 Chevrolet Custom Deluxe C10



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