need some rear end help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

remist17 · 05-24-2012, 12:03 PM

I have a 1987 chevy R10 stepside shortbed 10 bolt in the truck now. I want to pull the rear and replace it with a 1976 C20 12 bolt.

My issues...
I need to know the size of the u joint for the 10 and 12 bolt in order to make the conversion. Using the same 87 drive shaft

Does anyone know the sizes off hand>? and maybe who makes a combo U joint?

ont_guy_38 · 05-24-2012, 01:28 PM

They make a conversion joint and I know the part # has been posted on the board many times , just gotta find it....lol

Keith Seymore · 05-24-2012, 04:15 PM

I assume you know you'll have five lugs on the front, and eight lugs on the back, right? (unless you're doing something tricky with the axle shafts).

K

remist17 · 05-29-2012, 09:12 AM

8 lug were on the 4x4. My 12 bolt is the same as the 10 bolt lug pattern.
But I am not at work scratching my head

**N2TRUX** · 05-29-2012, 09:34 AM

Quote:

Originally Posted by remist17

8 lug were on the 4x4. My 12 bolt is the same as the 10 bolt lug pattern. But I am not at work scratching my head

Your info is a bit confusing. You state that the 1976 12 bolt is from a C20 which would be a 3/4ton. That would be an 8 lug axle, and I don't think it would be a 12 bolt.

remist17 · 05-30-2012, 12:51 PM

Its a 12 bolt. I am sure of that. I just never looked at the hubs.
I am not going to use it since I just bought new 5 lug rims.

remist17 · 05-30-2012, 04:09 PM

Well I took a look at the studs. Its a 5 lug 12 bolt.

76stepsidechevy · 05-30-2012, 08:26 PM

Thats a half ton rear end then, a little stronger than the ten bolt but not a whole lot. They should both have 1310 u joints.

remist17 · 06-01-2012, 12:48 PM

Quote:

Originally Posted by 76stepsidechevy

Thats a half ton rear end then, a little stronger than the ten bolt but not a whole lot. They should both have 1310 u joints.

Really... that would be GREAT !!!
I am using the 12bolt since it has the gears and the locker already in it. I installed it in the last truck I had .

remist17 · 06-29-2012, 12:12 PM

Can anyone help me locate information on the 12 bolt rear? I do not have the old u joint anymore and NAPA can not cross these to the 10 bolt.

1976 1/2 ton 12bolt 5 lug
going in
1987 1/2 ton with 10 bolt 5 lug now.

walkerscott · 07-02-2012, 12:00 AM

here ya go

05-24-2012, 12:03 PM	#1
remist17 Registered User Join Date: Jul 2009 Location: PA Posts: 406	need some rear end help I have a 1987 chevy R10 stepside shortbed 10 bolt in the truck now. I want to pull the rear and replace it with a 1976 C20 12 bolt. My issues... I need to know the size of the u joint for the 10 and 12 bolt in order to make the conversion. Using the same 87 drive shaft Does anyone know the sizes off hand>? and maybe who makes a combo U joint? __________________ 2013 Chevy Silverado, Z71, 5.3L, 4 door 2005 Chevy Silverado, Z71, 5.3L, 4 door, 3.40 Support the Troops.

05-24-2012, 01:28 PM	#2
ont_guy_38 Registered User Join Date: Jul 2007 Location: Ontario Canada Posts: 1,006	Re: need some rear end help They make a conversion joint and I know the part # has been posted on the board many times , just gotta find it....lol __________________ 1985 C10 2004 Avalanche

05-24-2012, 04:15 PM	#3
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,193	Re: need some rear end help I assume you know you'll have five lugs on the front, and eight lugs on the back, right? (unless you're doing something tricky with the axle shafts). K __________________ Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/

05-29-2012, 09:12 AM	#4
remist17 Registered User Join Date: Jul 2009 Location: PA Posts: 406	Re: need some rear end help 8 lug were on the 4x4. My 12 bolt is the same as the 10 bolt lug pattern. But I am not at work scratching my head __________________ 2013 Chevy Silverado, Z71, 5.3L, 4 door 2005 Chevy Silverado, Z71, 5.3L, 4 door, 3.40 Support the Troops.

05-30-2012, 12:51 PM	#6
remist17 Registered User Join Date: Jul 2009 Location: PA Posts: 406	Re: need some rear end help Its a 12 bolt. I am sure of that. I just never looked at the hubs. I am not going to use it since I just bought new 5 lug rims. __________________ 2013 Chevy Silverado, Z71, 5.3L, 4 door 2005 Chevy Silverado, Z71, 5.3L, 4 door, 3.40 Support the Troops.

05-30-2012, 04:09 PM	#7
remist17 Registered User Join Date: Jul 2009 Location: PA Posts: 406	Re: need some rear end help Well I took a look at the studs. Its a 5 lug 12 bolt. __________________ 2013 Chevy Silverado, Z71, 5.3L, 4 door 2005 Chevy Silverado, Z71, 5.3L, 4 door, 3.40 Support the Troops.

05-30-2012, 08:26 PM	#8
76stepsidechevy Registered User Join Date: Nov 2010 Location: Windsor Locks Posts: 628	Re: need some rear end help Thats a half ton rear end then, a little stronger than the ten bolt but not a whole lot. They should both have 1310 u joints.

06-29-2012, 12:12 PM	#10
remist17 Registered User Join Date: Jul 2009 Location: PA Posts: 406	Re: need some rear end help Can anyone help me locate information on the 12 bolt rear? I do not have the old u joint anymore and NAPA can not cross these to the 10 bolt. 1976 1/2 ton 12bolt 5 lug going in 1987 1/2 ton with 10 bolt 5 lug now. __________________ 2013 Chevy Silverado, Z71, 5.3L, 4 door 2005 Chevy Silverado, Z71, 5.3L, 4 door, 3.40 Support the Troops.



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