5 bolt conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bigblock69 · 08-20-2006, 12:31 PM

I am restoring a 68 C-10 and want to convert the rear to 5 bolt. I have a 71 1/2 ton that has a five bolt drum to drum; however, it is 3 inches wider than the rear from the 68 which would make the axle tubes extend out 1.5 inches too far. The mounting purches are the same distance, which leads me to believe it will bolt in. Question is this. Why is it wider and can I use it? If I cannot use it, I will have to buy new axles and a carrier to go to 5 lug posi. Any information will be much appreciated.

larry may · 08-20-2006, 12:49 PM

What is the actual measurement from out side to out side of unit you are wanting to install? from out side of drum to out side of drum. This may fit depending on the back spacing of the wheels you plan to use? My .0.2%

**Palf70Step** · 08-20-2006, 01:53 PM

IN mid 1970 the rears were widened about 1.5 inches ( at the backing plate) to match the width of the Disk front end. You could use the axles in your current one, but you would need a spacer built so the brake backing plate would mout correctly. Best bet is find a complete axle from a 71/72 and swap the entire assembly.

bigblock69 · 02-22-2007, 07:21 PM

Thanks, That is what I ended up doing.

70rs/ss · 02-22-2007, 07:53 PM

You can get a new set of 5-lug axles made for the 67-8 rear for $225 for the pair? Why not just buy new axles? In my opinion I wouldn't trust 35+year old axles, would you!?

08-20-2006, 12:31 PM	#1
bigblock69 Junior Member Join Date: Jun 2006 Location: St. Louis Posts: 26	5 bolt conversion I am restoring a 68 C-10 and want to convert the rear to 5 bolt. I have a 71 1/2 ton that has a five bolt drum to drum; however, it is 3 inches wider than the rear from the 68 which would make the axle tubes extend out 1.5 inches too far. The mounting purches are the same distance, which leads me to believe it will bolt in. Question is this. Why is it wider and can I use it? If I cannot use it, I will have to buy new axles and a carrier to go to 5 lug posi. Any information will be much appreciated.

08-20-2006, 12:49 PM	#2
larry may Senior Member Join Date: Jul 2005 Location: MISSOURI Posts: 3,256	Re: 5 bolt conversion What is the actual measurement from out side to out side of unit you are wanting to install? from out side of drum to out side of drum. This may fit depending on the back spacing of the wheels you plan to use? My .0.2%

08-20-2006, 01:53 PM	#3
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,083	Re: 5 bolt conversion IN mid 1970 the rears were widened about 1.5 inches ( at the backing plate) to match the width of the Disk front end. You could use the axles in your current one, but you would need a spacer built so the brake backing plate would mout correctly. Best bet is find a complete axle from a 71/72 and swap the entire assembly. __________________ 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! Last edited by Palf70Step; 08-20-2006 at 01:54 PM.

02-22-2007, 07:21 PM	#4
bigblock69 Junior Member Join Date: Jun 2006 Location: St. Louis Posts: 26	Re: 5 bolt conversion Thanks, That is what I ended up doing.

02-22-2007, 07:53 PM	#5
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,271	Re: 5 bolt conversion You can get a new set of 5-lug axles made for the 67-8 rear for $225 for the pair? Why not just buy new axles? In my opinion I wouldn't trust 35+year old axles, would you!?



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