5 lug all around swap for '69 GMC??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tx69gmc · 04-17-2006, 07:36 PM

Hey guys-

I am wanting to swap my '69 GMC to 5 lug axles all the way around. It currently has discs on the front and leaf spring rear. I believe the ratio to be 3.73 as it was originally a 6 cyl truck. I am most liekly going to be converting the TH350 to a 700r4 as well so wanted to get ideas on how best to approach the entire project. Front, rear, posi, ratios..etc. Thanks for the help

**Palf70Step** · 04-17-2006, 08:13 PM

Simplest is to get the rear out of a 71/72 Chevy/GMC 1/2 ton and bolt it in. You can also go with a 73-87 model rear also. In eith case since your's is a leaf spring truck, you'll need to move the spring mounts on the newer axle, unless you got lucky enough to find a 71/72 that was leaf sprung

**dennislbrooks** · 04-17-2006, 08:36 PM

Even more simple --- Denton --close to home. $30 bucks per rear axle shaft to turn flanges down at the machine shop --take a 5 lug drum with you to machine shop. You will need 10 each 1/2" x 1.25" long studs--- I suggest 1.25" long just in case you need a 1/4 spacer for some reason later-- maybe not. And we can drill them at the house on my jig -- bring beer. All the rest of your existing rear brakes will work. -- All you need to haul are the 2 axles and a drum.

I have 2 --5 lug rotors that I would probably trade for your 2 good 6 lugs.

04-17-2006, 07:36 PM	#1
tx69gmc Registered User Join Date: Nov 2005 Location: Denton,TX Posts: 61	5 lug all around swap for '69 GMC??? Hey guys- I am wanting to swap my '69 GMC to 5 lug axles all the way around. It currently has discs on the front and leaf spring rear. I believe the ratio to be 3.73 as it was originally a 6 cyl truck. I am most liekly going to be converting the TH350 to a 700r4 as well so wanted to get ideas on how best to approach the entire project. Front, rear, posi, ratios..etc. Thanks for the help

04-17-2006, 08:13 PM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,923	Re: 5 lug all around swap for '69 GMC??? Simplest is to get the rear out of a 71/72 Chevy/GMC 1/2 ton and bolt it in. You can also go with a 73-87 model rear also. In eith case since your's is a leaf spring truck, you'll need to move the spring mounts on the newer axle, unless you got lucky enough to find a 71/72 that was leaf sprung __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

04-17-2006, 08:36 PM	#3
dennislbrooks Senior Member Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,783	Re: 5 lug all around swap for '69 GMC??? Even more simple --- Denton --close to home. $30 bucks per rear axle shaft to turn flanges down at the machine shop --take a 5 lug drum with you to machine shop. You will need 10 each 1/2" x 1.25" long studs--- I suggest 1.25" long just in case you need a 1/4 spacer for some reason later-- maybe not. And we can drill them at the house on my jig -- bring beer. All the rest of your existing rear brakes will work. -- All you need to haul are the 2 axles and a drum. I have 2 --5 lug rotors that I would probably trade for your 2 good 6 lugs. Last edited by dennislbrooks; 04-17-2006 at 08:38 PM.



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