rear end question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

carl609 · 10-14-2007, 02:13 AM

Is there a difference in axle lengths from a 67 12 bolt versus a 70,71,72 12 bolt? I am pretty sure the ones after 73 are different but not sure about the older ones. Any info would be great.

70GMCer · 10-14-2007, 07:03 AM

67 to mid year 70 is longer. Mid year 70 to 72 the same.

**special-K** · 10-14-2007, 08:45 AM

Aren`t the mid`70-ups wider?

**Boog** · 10-14-2007, 09:27 AM

Longer by about an inch and a half.

70GMCer · 10-14-2007, 09:41 AM

Yep.....that's right. I checked my notes. I posted the info backwards.

ChevLoRay · 10-14-2007, 10:15 AM

...and aren't the '73 to '75's the same width as the mid-70 to '72's?

**Boog** · 10-14-2007, 10:22 AM

I have wondered the same thing but don't have one to measure. Change the axle to spring brackets and buy an adjustable panhard bar should be all that is needed.

carl609 · 10-18-2007, 04:47 AM

so the axle shafts themselves are different lengths to, or is it just the housings? I found some 71 5 lug shafts for sale and am wondering if they will fit in my 67 6 lug housing. Thanks for the feedback

**special-K** · 10-18-2007, 05:33 AM

Yeah,everything`s the same except the shafts and housing lengths must be matched year for year.Not sure about`73-up,but I believe they`d be the same from`70-up.Just went to all leaf suspensions in`73.

badpeanut · 10-19-2007, 11:20 PM

Does this also hold for '67-'72 leaf suspension (are the '67 to mid '70 leaf the same narrow width as coil)?

10-14-2007, 02:13 AM	#1
carl609 Registered User Join Date: Jan 2006 Location: Lynnwood, WA Posts: 63	rear end question Is there a difference in axle lengths from a 67 12 bolt versus a 70,71,72 12 bolt? I am pretty sure the ones after 73 are different but not sure about the older ones. Any info would be great.

10-14-2007, 07:03 AM	#2
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: rear end question 67 to mid year 70 is longer. Mid year 70 to 72 the same. __________________ 1997 GMC Sierra Ext 1965 Mustang

10-14-2007, 08:45 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: rear end question Aren`t the mid`70-ups wider? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

10-14-2007, 09:27 AM	#4
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,535	Re: rear end question Longer by about an inch and a half. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

10-14-2007, 09:41 AM	#5
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: rear end question Yep.....that's right. I checked my notes. I posted the info backwards. __________________ 1997 GMC Sierra Ext 1965 Mustang

10-14-2007, 10:15 AM	#6
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: rear end question ...and aren't the '73 to '75's the same width as the mid-70 to '72's? __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

10-14-2007, 10:22 AM	#7
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,535	Re: rear end question I have wondered the same thing but don't have one to measure. Change the axle to spring brackets and buy an adjustable panhard bar should be all that is needed. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

10-18-2007, 04:47 AM	#8
carl609 Registered User Join Date: Jan 2006 Location: Lynnwood, WA Posts: 63	Re: rear end question so the axle shafts themselves are different lengths to, or is it just the housings? I found some 71 5 lug shafts for sale and am wondering if they will fit in my 67 6 lug housing. Thanks for the feedback

10-18-2007, 05:33 AM	#9
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: rear end question Yeah,everything`s the same except the shafts and housing lengths must be matched year for year.Not sure about`73-up,but I believe they`d be the same from`70-up.Just went to all leaf suspensions in`73. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

10-19-2007, 11:20 PM	#10
badpeanut Not a bad nut after all.. Join Date: Dec 2000 Location: ND Posts: 1,759	Re: rear end question Does this also hold for '67-'72 leaf suspension (are the '67 to mid '70 leaf the same narrow width as coil)? __________________ '05 Chevy 2500HD 4x4 '72 GMC LWB 4x2 driver '72 Chevy LWB 4x4 plow truck '71 Blazer 4x4 driver '70 GMC LWB trailer



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