Posi clutch kit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hambone1958 · 02-22-2008, 08:11 PM

Does anybody know where I can get a posi rebuild kit for my 12-bolt. My local GM parts guy says they can't get it. Year One is out of stock. Of course they both want to sell me a whole posi unit. I was told there are two kits one with 12 clutches and 300lb springs and one with 14 clutches and 400lb springs.

Thanks,

Mint68 · 02-23-2008, 03:53 AM

My friend was in an automotive tech program at a local community college a few years back, and was going to rebuild the posi in my blazer. Long story short, no one could get any parts for it. The teacher said they couldn't be rebuilt, just to throw the chunk away and buy a new one. If you end up geting something that will rebuild it, please post the information on it, I would like to have it.

Bus Ted Knuckle · 02-23-2008, 03:55 AM

http://cgi.ebay.com/ebaymotors/Chevy...QQcmdZViewItem

I googled your question and found this on ebay.

**PICKMUP** · 02-23-2008, 05:09 AM

I just sent a posi carrier to Randy's Ring & Pinion...didn't even remove the ring gear. They replaced the clutches and installed heavier springs.

crazy longhorn · 02-23-2008, 05:30 AM

A few yrs back I rebuilt a unit for the 12 bolt in my longhorn, & got the pcs through a local driveline shop. too many yrs to remember on the clutch count, but if you are street driven, you dont want to go too heavy on the springs. The other thing, is that by the time I replaced clutches,springs ,spring plates,shims, & the pin.....I was about 1/2 way to the price of a new unit. I have never had any trouble with the unit, but my understanding is that the new Eaton units have a carbon fiber facing on the discs.....just fruit for thought. crazyL

JimKshortstep4x4 · 02-23-2008, 07:58 AM

If it is an Eaton possi unit, the replacement parts can be ordered from Tom's Differentials. They have been in the differential business for 35 years so they know differentials.

Here is a link:

http://www.tomsdifferentials.com/tomp.htm

Jim

kaycee · 02-23-2008, 10:30 AM

Got my kit from randys ring &pinion

hambone1958 · 02-23-2008, 06:02 PM

Great info guys. I'm building this 12 bolt for my 72 GSX clone drag car. I went to Randy's and I see where they sell four spring kits 200, 300, 400 and 800lb spring kits. Which would be best for a strip only car?

hubcapboy · 02-24-2008, 12:06 AM

Hambone: I'm having exactly the same problem. I can find spring kits, I can find a bearing kit, but I can't find a clutch kit.... hence, my posi is sitting on the shelf in my workshop instead of where it belongs.

I yanked mine from a junkyard truck, expecting to be able to pick up these parts anywhere, and I'm shocked that there aren't more options for clutches (or, I should say, any options for clutches).

/g

02-22-2008, 08:11 PM	#1
hambone1958 Registered User Join Date: Feb 2003 Location: Point Harbor NC Posts: 299	Posi clutch kit Does anybody know where I can get a posi rebuild kit for my 12-bolt. My local GM parts guy says they can't get it. Year One is out of stock. Of course they both want to sell me a whole posi unit. I was told there are two kits one with 12 clutches and 300lb springs and one with 14 clutches and 400lb springs. Thanks, __________________ Alan

02-23-2008, 03:53 AM	#2
Mint68 Registered User Join Date: Nov 2004 Location: Nebraska Posts: 762	Re: Posi clutch kit My friend was in an automotive tech program at a local community college a few years back, and was going to rebuild the posi in my blazer. Long story short, no one could get any parts for it. The teacher said they couldn't be rebuilt, just to throw the chunk away and buy a new one. If you end up geting something that will rebuild it, please post the information on it, I would like to have it.

02-23-2008, 03:55 AM	#3
Bus Ted Knuckle Son of a gun Join Date: Jan 2007 Location: Hot Springs, Arkansas Posts: 1,636	Re: Posi clutch kit http://cgi.ebay.com/ebaymotors/Chevy...QQcmdZViewItem I googled your question and found this on ebay. __________________ Bill BEATERS ARE NEATER

02-23-2008, 05:09 AM	#4
PICKMUP "Trucks with Class" Join Date: Jul 2000 Location: OLYMPIA, WA, USA Posts: 8,158	Re: Posi clutch kit I just sent a posi carrier to Randy's Ring & Pinion...didn't even remove the ring gear. They replaced the clutches and installed heavier springs.

02-23-2008, 05:30 AM	#5
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Re: Posi clutch kit A few yrs back I rebuilt a unit for the 12 bolt in my longhorn, & got the pcs through a local driveline shop. too many yrs to remember on the clutch count, but if you are street driven, you dont want to go too heavy on the springs. The other thing, is that by the time I replaced clutches,springs ,spring plates,shims, & the pin.....I was about 1/2 way to the price of a new unit. I have never had any trouble with the unit, but my understanding is that the new Eaton units have a carbon fiber facing on the discs.....just fruit for thought. crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

02-23-2008, 07:58 AM	#6
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Posi clutch kit If it is an Eaton possi unit, the replacement parts can be ordered from Tom's Differentials. They have been in the differential business for 35 years so they know differentials. Here is a link: http://www.tomsdifferentials.com/tomp.htm Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

02-23-2008, 10:30 AM	#7
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,449	Re: Posi clutch kit Got my kit from randys ring &pinion __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

02-23-2008, 06:02 PM	#8
hambone1958 Registered User Join Date: Feb 2003 Location: Point Harbor NC Posts: 299	Re: Posi clutch kit Great info guys. I'm building this 12 bolt for my 72 GSX clone drag car. I went to Randy's and I see where they sell four spring kits 200, 300, 400 and 800lb spring kits. Which would be best for a strip only car? __________________ Alan

02-24-2008, 12:06 AM	#9
hubcapboy Registered User Join Date: Jun 2007 Location: Albuquerque Posts: 21	Re: Posi clutch kit Hambone: I'm having exactly the same problem. I can find spring kits, I can find a bearing kit, but I can't find a clutch kit.... hence, my posi is sitting on the shelf in my workshop instead of where it belongs. I yanked mine from a junkyard truck, expecting to be able to pick up these parts anywhere, and I'm shocked that there aren't more options for clutches (or, I should say, any options for clutches). /g



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