Posi with 3:73 - will this work? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hemihead · 08-23-2007, 11:03 PM

I bought this posi on ebay. I was expecting the clutch type posi but have something I haven't seen before. The add said it was for a 12 bolt truck diff. Can someone help me out and tell me what I bought?

I have it going in my 67 SWB which currently has a 3:07 open diff.

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centsless · 08-23-2007, 11:26 PM

That looks like a no-spin rear. Also referred to as a gov-bomb.

BCOWANWHEELS · 08-23-2007, 11:40 PM

Its A Eaton Gov Lock And It Will Do Fine Unless You Jerk It Around All The Time. They Get A Bad Rep Cause You Cant Beat Them To Death. Good Driver Quality Diff.

69TowRig · 08-23-2007, 11:51 PM

Quote:

Originally Posted by centsless

That looks like a no-spin rear. Also referred to as a gov-bomb.

It is an Eaton Gov-Lock ("gov-bomb" moniker above). It is not a Detroit No-Spin, up until very recently they weren't even made by the same company. Those parts you can see in the picture are part of the centrifugal weight system used to engage a set of dog-clutches to lock the differential.

This is yet another one of the on-going sagas with the wrongful use of the word "posi". Posi is an Eaton trademark, always has been, for their clutch-type limited slip differentials. I think in the world of automotive nomenclature the word "posi" is one of the most generalized and most time incorrectly used of all time. My own brother refers to "posis" as the two-tracks left by his Chevelle on asphalt after he prods the gas pedal.

hemihead · 08-23-2007, 11:59 PM

My 67 is a daily driver, back to forth to work, town trips, and the odd road trip. It might see the odd burn out and launch but thats about it. Paid $122 shipped with the 3:73 gear set.

Should I keep or resell and see if I can get my hands on a clutch type posi?

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**N2TRUX** · 08-24-2007, 12:03 AM

You should keep the gears and sell the truck.......to me.....

72armyswbtruck · 08-24-2007, 12:33 AM

N2TRUX one of these days someone is going to take you up on your offer.

BCOWANWHEELS · 08-24-2007, 12:39 AM

Keep It And Run It.........

toomanytoyz · 08-24-2007, 01:07 AM

Welcome From Indiana, Your Truck is Really Nice..............

Thanks, Rick

GREASEMONKEY72 · 08-24-2007, 02:47 AM

WELCOME to the board

i say just run it, you can always change it later if you dont like it

hemihead · 08-24-2007, 06:26 PM

Thanks for the comments, I have since dropped the truck and re-wired the truck with a Painless kit.

Thinking about 700r tranny this winter and getting rid of the drums for discs with power brakes. So since I will be in the rear end I will get rid of the 3.07 open carrier and put in the 3.73 gov lock.

The current T350 seems to only hold rpm to 3000 and then shift so it definitely needs a rebuild.

The cab has some minor rust issues which need attentin but that will likely be the last thing I touch.

08-23-2007, 11:03 PM	#1
hemihead Registered User Join Date: Mar 2007 Location: Estevan, Sask, Canada Posts: 185	Posi with 3:73 - will this work? I bought this posi on ebay. I was expecting the clutch type posi but have something I haven't seen before. The add said it was for a 12 bolt truck diff. Can someone help me out and tell me what I bought? I have it going in my 67 SWB which currently has a 3:07 open diff. Last edited by hemihead; 08-23-2007 at 11:06 PM.

08-23-2007, 11:26 PM	#2
centsless sufficiently talented fool Join Date: Jun 2006 Location: Forest Hill, MD Posts: 2,231	Re: Posi with 3:73 - will this work? That looks like a no-spin rear. Also referred to as a gov-bomb. __________________ "it's impossible to be surrounded by idiots when you are part of the circle" 2003 Suburban 2002 Pontiac Montana 1981 Corvette 1966 Impala Convertible Click here to support the board

08-23-2007, 11:40 PM	#3
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: Posi with 3:73 - will this work? Its A Eaton Gov Lock And It Will Do Fine Unless You Jerk It Around All The Time. They Get A Bad Rep Cause You Cant Beat Them To Death. Good Driver Quality Diff. __________________ I BELIEVE IN JOHN 3:16

08-23-2007, 11:59 PM	#5
hemihead Registered User Join Date: Mar 2007 Location: Estevan, Sask, Canada Posts: 185	Re: Posi with 3:73 - will this work? My 67 is a daily driver, back to forth to work, town trips, and the odd road trip. It might see the odd burn out and launch but thats about it. Paid $122 shipped with the 3:73 gear set. Should I keep or resell and see if I can get my hands on a clutch type posi?

08-24-2007, 12:03 AM	#6
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,023	Re: Posi with 3:73 - will this work? You should keep the gears and sell the truck.......to me..... __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

08-24-2007, 12:33 AM	#7
72armyswbtruck Registered User Join Date: Feb 2004 Location: Idaho Posts: 4,034	Re: Posi with 3:73 - will this work? N2TRUX one of these days someone is going to take you up on your offer. __________________ "Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!"

08-24-2007, 12:39 AM	#8
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: Posi with 3:73 - will this work? Keep It And Run It......... __________________ I BELIEVE IN JOHN 3:16

08-24-2007, 01:07 AM	#9
toomanytoyz Luv the Crewcabs Join Date: Aug 2006 Location: Andrews, In. 46702 Posts: 4,097	Re: Posi with 3:73 - will this work? Welcome From Indiana, Your Truck is Really Nice.............. Thanks, Rick

08-24-2007, 02:47 AM	#10
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: Posi with 3:73 - will this work? WELCOME to the board i say just run it, you can always change it later if you dont like it __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME

08-24-2007, 06:26 PM	#11
hemihead Registered User Join Date: Mar 2007 Location: Estevan, Sask, Canada Posts: 185	Re: Posi with 3:73 - will this work? Thanks for the comments, I have since dropped the truck and re-wired the truck with a Painless kit. Thinking about 700r tranny this winter and getting rid of the drums for discs with power brakes. So since I will be in the rear end I will get rid of the 3.07 open carrier and put in the 3.73 gov lock. The current T350 seems to only hold rpm to 3000 and then shift so it definitely needs a rebuild. The cab has some minor rust issues which need attentin but that will likely be the last thing I touch.



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