12 bolt Rear End Info - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jferrante · 02-21-2018, 09:37 PM

Is there any reason a 1965 GMC 3:73 12 bolt with leaf springs rear end not work on my 66? I currently have a 10 bolt and understand the 12 bolt is a good upgrade even if its not posi.
Appreciate the info.

**Clyde65** · 02-21-2018, 10:39 PM

66 with a 10 bolt?

66’s has 12 bolts stock. Mounts would be the only consideration.

**Captainfab** · 02-22-2018, 12:53 AM

A 65 GMC 12 bolt will be exactly the same as a '64-'70 Chevy 12 bolt aside from having leaf spring mounts as opposed to trailing arm mounts. I do make the trailing arm mounts if you end up needing a set.

Jferrante · 02-22-2018, 08:19 AM

great thanks, not sure why it has a 10 bolt but it does.

**PGSigns** · 02-22-2018, 08:35 AM

Jeff is it trailing arms?
Jimmy

Jferrante · 02-22-2018, 12:31 PM

Quote:

Originally Posted by PGSigns

Jeff is it trailing arms?
Jimmy

The 12 bolts i found local is leaf spring. The 10 bolt I have currently is trailing arms.
I didnt know if the 12 bolt was worth grabbing or just keeping the 10 bolt. But it sounds like the 10 bolt I have isnt stock so I am curious what it came off of.

**PGSigns** · 02-22-2018, 01:24 PM

You need to take a close look at the GMC rear and make sure it is not a Dana 44. They were in a good bit of them. I have trailing arm12 bolts if you need one and a Dana 44.
Jimmy

graymage · 02-23-2018, 08:46 AM

my 66 gmc had a 10 stock with leaf springs

**Captainfab** · 02-24-2018, 12:11 AM

That would be a Dana 44.

Quote:

Originally Posted by graymage

my 66 gmc had a 10 stock with leaf springs

Jferrante · 02-25-2018, 02:48 PM

Got a pic of the markings on my 10 bolt- is this the Dana 44?

**PGSigns** · 02-25-2018, 06:15 PM

Nope that's not a Dana. Looks like a car or maybe a S10 rear.
Jimmy

graymage · 02-25-2018, 09:48 PM

so I still have that diff if you want to make a road trip to Nebraska lol!!!, I would throw it on my trailer and bring it to you but I can't find nj in my atlas

**PGSigns** · 02-26-2018, 07:24 AM

No need to go all the way to Nebraska. He does need a good 12 bolt.
Jimmy

graymage · 02-26-2018, 07:43 AM

Ya I was just kidding, I built a 12 bolt posi with 373s for mine

rvrfoot · 02-26-2018, 07:43 PM

Quote:

Originally Posted by Jferrante

Got a pic of the markings on my 10 bolt- is this the Dana 44?

Oh wow, That chrome cover has a lot of bling bling.

02-21-2018, 09:37 PM	#1
Jferrante Registered User Join Date: Jan 2015 Location: Arlington VA Posts: 359	12 bolt Rear End Info Is there any reason a 1965 GMC 3:73 12 bolt with leaf springs rear end not work on my 66? I currently have a 10 bolt and understand the 12 bolt is a good upgrade even if its not posi. Appreciate the info.

02-21-2018, 10:39 PM	#2
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,547	Re: 12 bolt Rear End Info 66 with a 10 bolt? 66’s has 12 bolts stock. Mounts would be the only consideration. __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

02-22-2018, 12:53 AM	#3
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: 12 bolt Rear End Info A 65 GMC 12 bolt will be exactly the same as a '64-'70 Chevy 12 bolt aside from having leaf spring mounts as opposed to trailing arm mounts. I do make the trailing arm mounts if you end up needing a set. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

02-22-2018, 08:19 AM	#4
Jferrante Registered User Join Date: Jan 2015 Location: Arlington VA Posts: 359	Re: 12 bolt Rear End Info great thanks, not sure why it has a 10 bolt but it does.

02-22-2018, 08:35 AM	#5
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: 12 bolt Rear End Info Jeff is it trailing arms? Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

02-22-2018, 01:24 PM	#7
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: 12 bolt Rear End Info You need to take a close look at the GMC rear and make sure it is not a Dana 44. They were in a good bit of them. I have trailing arm12 bolts if you need one and a Dana 44. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

02-23-2018, 08:46 AM	#8
graymage Registered User Join Date: Jan 2017 Location: hastings, ne Posts: 81	Re: 12 bolt Rear End Info my 66 gmc had a 10 stock with leaf springs

02-25-2018, 02:48 PM	#10
Jferrante Registered User Join Date: Jan 2015 Location: Arlington VA Posts: 359	Re: 12 bolt Rear End Info Got a pic of the markings on my 10 bolt- is this the Dana 44?

02-25-2018, 06:15 PM	#11
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: 12 bolt Rear End Info Nope that's not a Dana. Looks like a car or maybe a S10 rear. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

02-25-2018, 09:48 PM	#12
graymage Registered User Join Date: Jan 2017 Location: hastings, ne Posts: 81	Re: 12 bolt Rear End Info so I still have that diff if you want to make a road trip to Nebraska lol!!!, I would throw it on my trailer and bring it to you but I can't find nj in my atlas

02-26-2018, 07:24 AM	#13
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: 12 bolt Rear End Info No need to go all the way to Nebraska. He does need a good 12 bolt. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

02-26-2018, 07:43 AM	#14
graymage Registered User Join Date: Jan 2017 Location: hastings, ne Posts: 81	Re: 12 bolt Rear End Info Ya I was just kidding, I built a 12 bolt posi with 373s for mine

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