change 6-bolt to 5-bolt - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blue Chevy · 06-09-2002, 03:18 PM

Have a 70 C10 with 6-bolt rear axles. Is it possible to install 71 to 72, 5-bolt axle shafts into my housing.

bowtie · 06-09-2002, 03:34 PM

yes it is, I have a 70 gmc and I took the axles from a 71.

Mitzki5 · 06-09-2002, 03:36 PM

How hard is it to do. Also, is there a website that has some info on how to do it? I would like to see what's involved before I try it. Thanks

1-PU70 · 06-09-2002, 04:29 PM

I have a 70 fleetside and I used axels from a 77. Very easy to do. Pull wheels and break drums, remove rear axel cover,remove pin holding spider gears, push in axels, remove "C" clips (a magnet might be helpful) and pull axels. To install reverse. Good luck!

Blue Chevy · 06-09-2002, 10:54 PM

Thanks for the replies. I had heard I couldn't put these 5-bolt axles in my housing, or is it just '70 that you can and not '67-'69? I'm also putting spindles for '71 on my '70 and heard I needed to change my outer tie-rod ends. Does anyone know if I will need to change my manual, drum brake, master cylinder, to a bigger diameter piston master cylinder because of the calipers?

XXL · 06-09-2002, 11:01 PM

Quote:

Originally posted by Blue Chevy
Does anyone know if I will need to change my manual, drum brake, master cylinder, to a bigger diameter piston master cylinder because of the calipers?

You need the disc brake master cylinder, and you need to change the front brake hard lines down one size from what they are with the drum configuration, along with the appropriate tee fitting that ties the new front hard lines into the line coming down from the proportioning valve. Oh... you'll need a proportioning valve.

Here's a decent article to get you started... Truckin' Magazine article

Kenneth

Longhorn Man · 06-09-2002, 11:49 PM

You are right on the 5 lug axle shafts...only on a '70 can you pull the flim flam, 69 and older you'd need custom spacers or custom shafts.

06-09-2002, 03:18 PM	#1
Blue Chevy Registered User Join Date: Jun 2002 Location: Winnipeg, MB, Canada Posts: 9	change 6-bolt to 5-bolt Have a 70 C10 with 6-bolt rear axles. Is it possible to install 71 to 72, 5-bolt axle shafts into my housing.

06-09-2002, 03:34 PM	#2
bowtie Senior Member Join Date: Dec 1999 Location: Saskatchewan Posts: 1,050	yes it is, I have a 70 gmc and I took the axles from a 71. __________________ ~70 GMCprostreet swb 396/700r NOS 575 hp "the Brick" ~72 chev swb w/68 front clip "GM Millenium corvette yellow" I use and accept Paypal

06-09-2002, 03:36 PM	#3
Mitzki5 "TRUCKLESS" Join Date: Jan 2002 Location: Tuscola IL Posts: 457	How hard is it to do. Also, is there a website that has some info on how to do it? I would like to see what's involved before I try it. Thanks __________________ Mitzki5 No longer have an old truck! But always looking for another one!

06-09-2002, 04:29 PM	#4
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	I have a 70 fleetside and I used axels from a 77. Very easy to do. Pull wheels and break drums, remove rear axel cover,remove pin holding spider gears, push in axels, remove "C" clips (a magnet might be helpful) and pull axels. To install reverse. Good luck! __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

06-09-2002, 10:54 PM	#5
Blue Chevy Registered User Join Date: Jun 2002 Location: Winnipeg, MB, Canada Posts: 9	Thanks for the replies. I had heard I couldn't put these 5-bolt axles in my housing, or is it just '70 that you can and not '67-'69? I'm also putting spindles for '71 on my '70 and heard I needed to change my outer tie-rod ends. Does anyone know if I will need to change my manual, drum brake, master cylinder, to a bigger diameter piston master cylinder because of the calipers?

06-09-2002, 11:49 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	You are right on the 5 lug axle shafts...only on a '70 can you pull the flim flam, 69 and older you'd need custom spacers or custom shafts.



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