HELP!! trying to rebuild a freefloating rear axle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jdfastlane03 · 08-15-2011, 07:41 PM

I have a 1970 chevy 8-lug free-floating axle its a 4:56 posi, trying to rebuild the posi unit where can I find parts and anyone know what the backlash and clearances are suppose to be? and how can i convert it to accept dually wheels? any help would be awsome thanks guys

Mr. 250r · 08-15-2011, 10:20 PM

By free floating do you mean full floating? http://www.pirate4x4.com/tech/billav...ble/index.html there's a big ol bible on them and as for converting to a dually i see some people just using a big spacer so both tires fit now i am not sure if thats the right way to do it but if so here's a link for an example hope it helps http://www.pirate4x4.com/forum/showthread.php?t=659176

**special-K** · 08-16-2011, 08:31 AM

I assume you have the factory No-Spin/Detroit Locker. You can get parts from Eaton dealers. www.eaton.com . The HO52 has a dual wheel cousin (HO72) with the same differential. The housing and shafts are shorter and brakes are different. But,I believe you could swap the outer parts (brakes/hub) from a dual rear HO72. If not,maybe Arrowcraft can help www.arrowcraft.com.

jdfastlane03 · 08-16-2011, 06:04 PM

thanks guys both links are awsome I didnt know about the ho72 axle maybe I can find one in the bone yard and make 1 out of 2

LONGHAIR · 08-16-2011, 07:36 PM

Quote:

Originally Posted by jdfastlane03

trying to rebuild the posi unit where can I find parts and anyone know what the backlash and clearances are suppose to be?

At this point, it doesn't really matter...with used gears, you cannot change or "adjust" it now. Trying to "tighten-up" the backlash will absolutely destroy the ring and pinion....and create a howl in the process.

If the backlash is already excessive, you need new gears to start with....and a professional to install them.

Mike C · 08-16-2011, 09:25 PM

Do we know that he doesn't have a Dana 60?

Is this a leaf spring or coil spring truck?

Redcap · 08-16-2011, 09:48 PM

Pics of rearend in question are needed.

08-15-2011, 07:41 PM	#1
jdfastlane03 Registered User Join Date: Jul 2003 Location: MASS. Posts: 48	HELP!! trying to rebuild a freefloating rear axle I have a 1970 chevy 8-lug free-floating axle its a 4:56 posi, trying to rebuild the posi unit where can I find parts and anyone know what the backlash and clearances are suppose to be? and how can i convert it to accept dually wheels? any help would be awsome thanks guys

08-15-2011, 10:20 PM	#2
Mr. 250r Registered User Join Date: Dec 2010 Location: freeburg, illinois Posts: 885	Re: HELP!! trying to rebuild a freefloating rear axle By free floating do you mean full floating? http://www.pirate4x4.com/tech/billav...ble/index.html there's a big ol bible on them and as for converting to a dually i see some people just using a big spacer so both tires fit now i am not sure if thats the right way to do it but if so here's a link for an example hope it helps http://www.pirate4x4.com/forum/showthread.php?t=659176 __________________ 1987 Chevy V30 - http://67-72chevytrucks.com/vboard/s...d.php?t=573854 1988 IROC-Z Camaro - 305/T5 T-Top 1989 GMC V35 - Marbolo Express http://67-72chevytrucks.com/vboard/s...d.php?t=596850 1991 V2500 Suburban Silverado - Sold 1991 V2500 Suburban Scottsdale - Big Nasty http://67-72chevytrucks.com/vboard/s...d.php?t=497423 2001 Ram 3500 5.9 H.O NV56 EC DRW - Sold 2003 1500 Silverado 2004 Ram 3500 5.9 H.O NV56 CC DRW - Sold 2005 Silverado 2500HD 6.6/ZF6 CC LWB

08-16-2011, 08:31 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: HELP!! trying to rebuild a freefloating rear axle I assume you have the factory No-Spin/Detroit Locker. You can get parts from Eaton dealers. www.eaton.com . The HO52 has a dual wheel cousin (HO72) with the same differential. The housing and shafts are shorter and brakes are different. But,I believe you could swap the outer parts (brakes/hub) from a dual rear HO72. If not,maybe Arrowcraft can help www.arrowcraft.com. __________________ "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 ~

08-16-2011, 06:04 PM	#4
jdfastlane03 Registered User Join Date: Jul 2003 Location: MASS. Posts: 48	Re: HELP!! trying to rebuild a freefloating rear axle thanks guys both links are awsome I didnt know about the ho72 axle maybe I can find one in the bone yard and make 1 out of 2

08-16-2011, 09:25 PM	#6
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,728	Re: HELP!! trying to rebuild a freefloating rear axle Do we know that he doesn't have a Dana 60? Is this a leaf spring or coil spring truck? __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

08-16-2011, 09:48 PM	#7
Redcap Registered User Join Date: May 2010 Location: Lewis County, WA Posts: 1,523	Re: HELP!! trying to rebuild a freefloating rear axle Pics of rearend in question are needed.



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