Posi Install, rigth axle to far out of housing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Magnus-stepper · 08-05-2015, 03:41 PM

Hello!
I have installed a new posi in my 69 truck. I noticed when I was sliding my drum brakes on the axles a bigger gap on the right axle then on the left axle. I can get my finger tip between the drum and the brakeshield. The left side sits perfect. Have anyone seen this before? I cant remember 100% but I dont think it was like this with the old carrier.
C-clips looks good and everything else is just fine.
Its a eaton posi with 3.08 gears.
Would you guys run it like this??
Thanks!

**LockDoc** · 08-05-2015, 05:42 PM

Quote:

Originally Posted by Magnus-stepper

Hello!
I have installed a new posi in my 69 truck. I noticed when I was sliding my drum brakes on the axles a bigger gap on the right axle then on the left axle. I can get my finger tip between the drum and the brakeshield. The left side sits perfect. Have anyone seen this before? I cant remember 100% but I dont think it was like this with the old carrier.
C-clips looks good and everything else is just fine.
Its a eaton posi with 3.08 gears.
Would you guys run it like this??
Thanks!

Did you notice any difference in the length of the axles? If the C-clips are both seated, it sounds like you have two different length axles.... Sometime in 1971 GM started using a wider rear end and the axles are 3/4 inch longer. I wonder if someone replaced one of your axles and not knowing the difference used one of the later axles.... I don't think I would run it that way.

LockDoc

Magnus-stepper · 08-05-2015, 05:49 PM

I think the axles are the same size but i could make sense what you are saying. I forgot too tell that the posi was from an el camino, dont know what year tho. the posi is not factory but aftermarket.

But if I am going to run it like this i would have too adjust the axle to center of the truck, so if the one axle is 5mm to far out I will have too move it 2,5 mm too the left, and then it sits in center of the truck. I think it will work, its not like its a dragster.. lol

Bigdav160 · 08-05-2015, 06:01 PM

I thought El Caminos used car axles and not truck axles. I think they use different differential cases.

Magnus-stepper · 08-05-2015, 06:11 PM

That I dont know.. Maybe they fitted a truck axle on the elco? The posi fitts the truck axle and everything matches. I dont know what the diffrence between the car 12bolt and the truck 12bolt, anyone?

**Ironangel** · 08-06-2015, 08:19 AM

The El Camino housing and carrier are indeed a "Car 12-Bolt"...That's not a bad thing and in fact is a good thing but will not interchange with truck axles or components... The first image is a car 12 and the second image is a truck 12. Car has a horizontal eyebrow on the cover and the truck 12 has a vertical bulge in the cover...

mike16 · 08-06-2015, 06:43 PM

sometimes when your ina bind and you need a replacement axle other axles will do in a pinch.

maybe the axle was replaced with an axle from a newer truck. they are wider?.

I run into the same problem with chevelle 12 bolts rears the 67 and older ones are narrower and it was common to find the 68 and later ones that are wider being installed maybe in a pinch or in ignorance.

maybe latter axles are wider but fit only so so.

maybe in a pinch you go for an Enfield inch.

08-05-2015, 03:41 PM	#1
Magnus-stepper Registered User Join Date: Aug 2012 Location: Norway Posts: 28	Posi Install, rigth axle to far out of housing Hello! I have installed a new posi in my 69 truck. I noticed when I was sliding my drum brakes on the axles a bigger gap on the right axle then on the left axle. I can get my finger tip between the drum and the brakeshield. The left side sits perfect. Have anyone seen this before? I cant remember 100% but I dont think it was like this with the old carrier. C-clips looks good and everything else is just fine. Its a eaton posi with 3.08 gears. Would you guys run it like this?? Thanks!

08-05-2015, 05:49 PM	#3
Magnus-stepper Registered User Join Date: Aug 2012 Location: Norway Posts: 28	Re: Posi Install, rigth axle to far out of housing I think the axles are the same size but i could make sense what you are saying. I forgot too tell that the posi was from an el camino, dont know what year tho. the posi is not factory but aftermarket. But if I am going to run it like this i would have too adjust the axle to center of the truck, so if the one axle is 5mm to far out I will have too move it 2,5 mm too the left, and then it sits in center of the truck. I think it will work, its not like its a dragster.. lol

08-05-2015, 06:01 PM	#4
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: Posi Install, rigth axle to far out of housing I thought El Caminos used car axles and not truck axles. I think they use different differential cases. __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe

08-05-2015, 06:11 PM	#5
Magnus-stepper Registered User Join Date: Aug 2012 Location: Norway Posts: 28	Re: Posi Install, rigth axle to far out of housing That I dont know.. Maybe they fitted a truck axle on the elco? The posi fitts the truck axle and everything matches. I dont know what the diffrence between the car 12bolt and the truck 12bolt, anyone?

08-06-2015, 08:19 AM	#6
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: Posi Install, rigth axle to far out of housing The El Camino housing and carrier are indeed a "Car 12-Bolt"...That's not a bad thing and in fact is a good thing but will not interchange with truck axles or components... The first image is a car 12 and the second image is a truck 12. Car has a horizontal eyebrow on the cover and the truck 12 has a vertical bulge in the cover... __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American" Last edited by Ironangel; 08-06-2015 at 08:29 AM.

08-06-2015, 06:43 PM	#7
mike16 Registered User Join Date: Dec 2009 Location: bisbee, arizona Posts: 1,529	Re: Posi Install, rigth axle to far out of housing sometimes when your ina bind and you need a replacement axle other axles will do in a pinch. maybe the axle was replaced with an axle from a newer truck. they are wider?. I run into the same problem with chevelle 12 bolts rears the 67 and older ones are narrower and it was common to find the 68 and later ones that are wider being installed maybe in a pinch or in ignorance. maybe latter axles are wider but fit only so so. maybe in a pinch you go for an Enfield inch.



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