Will this work? 75 5 lug rear end to replace my 69 gmc 6 bolt? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tranz am · 04-06-2007, 10:21 PM

Today I was at the junk yard and found a 5 lug 342 posi under a 75 chevy 3/4 ton flat bed. It seams strange that it was bolted to that 3/4 ton suspension.
I need to know if this can be made to fit under my 69 1/2 ton 2 X4 GMC. I will be going down there tomorrow morning to rip it out if it will work. So this info is urgently needed.
Here are some pics

1969k10stepside · 04-06-2007, 10:23 PM

You want to put a 5 lug rear in a 1/2 ton?That truck (3/4 ton) shouldnt have had a 5 lug anyway.And no,the shock mounts are different as are the spring perches.It will work with those modifications to make it work on 67-72s though

tranz am · 04-06-2007, 10:26 PM

No, I want to put it in my 69 half ton.

1969k10stepside · 04-06-2007, 10:28 PM

I thought you said it was a K15.K15 means 1/2 ton GMC 4x4.
So,assuming instead it is a 2wd,with leafs....you will need to fab up a set of mounts for springs for the springs still as they are different than ones from a newer model,as are the shock locations.

arkracing · 04-06-2007, 10:31 PM

Anything can be made to fit. The spring pads will need to be changed as well as the shock mount - nothing a grinder and welder won't take care of.

You can buy new trailing arm perches/spring perches. - and you can cut the shock mounts off your existing '69

Is your truck 4x4 or 2x4 - cause if it is 4x4 your wasting your time - as there isn't chevy front axle with a 5 bolt pattern

04-06-2007, 10:21 PM	#1
tranz am Registered User Join Date: Apr 2007 Location: Santa Rosa, Ca Posts: 586	Will this work? 75 5 lug rear end to replace my 69 gmc 6 bolt? Today I was at the junk yard and found a 5 lug 342 posi under a 75 chevy 3/4 ton flat bed. It seams strange that it was bolted to that 3/4 ton suspension. I need to know if this can be made to fit under my 69 1/2 ton 2 X4 GMC. I will be going down there tomorrow morning to rip it out if it will work. So this info is urgently needed. Here are some pics __________________ My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=456220 Best 1/4 mile time 12.1 @ 111 w/traction issues 1969 GMC SWB 1964 chevy II Nova ht Last edited by tranz am; 04-06-2007 at 10:45 PM.

04-06-2007, 10:23 PM	#2
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,020	Re: Will this work? 75 5 lug rear end to replace my 69 gmc 6 bolt? You want to put a 5 lug rear in a 1/2 ton?That truck (3/4 ton) shouldnt have had a 5 lug anyway.And no,the shock mounts are different as are the spring perches.It will work with those modifications to make it work on 67-72s though Last edited by 1969k10stepside; 04-06-2007 at 10:30 PM.

04-06-2007, 10:26 PM	#3
tranz am Registered User Join Date: Apr 2007 Location: Santa Rosa, Ca Posts: 586	Re: Will this work? 75 5 lug rear end to replace my 69 gmc 6 bolt? No, I want to put it in my 69 half ton. __________________ My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=456220 Best 1/4 mile time 12.1 @ 111 w/traction issues 1969 GMC SWB 1964 chevy II Nova ht

04-06-2007, 10:28 PM	#4
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,020	Re: Will this work? 75 5 lug rear end to replace my 69 gmc 6 bolt? I thought you said it was a K15.K15 means 1/2 ton GMC 4x4. So,assuming instead it is a 2wd,with leafs....you will need to fab up a set of mounts for springs for the springs still as they are different than ones from a newer model,as are the shock locations. Last edited by 1969k10stepside; 04-06-2007 at 10:29 PM.

04-06-2007, 10:31 PM	#5
arkracing Weekend Warrior Join Date: Oct 2004 Location: CT Posts: 1,787	Re: Will this work? 75 5 lug rear end to replace my 69 gmc 6 bolt? Anything can be made to fit. The spring pads will need to be changed as well as the shock mount - nothing a grinder and welder won't take care of. You can buy new trailing arm perches/spring perches. - and you can cut the shock mounts off your existing '69 Is your truck 4x4 or 2x4 - cause if it is 4x4 your wasting your time - as there isn't chevy front axle with a 5 bolt pattern __________________ -'07 GMC Sierra K2500HD -'66 C10 Suburban -'68/'71 K20 Service Bed Project -'69 Chevy C30 Mason Dump -'33Ford P/U 396ChevyPowered Last edited by arkracing; 04-06-2007 at 10:34 PM.



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