Difference between 72 & 73 12 bolt? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

azsmokey · 02-09-2008, 08:24 AM

What are the differences, if any, between the 12 bolt rear end in a 72 K10 and a 73 K10? Will a disc brake conversion kit for a 73 work on a 72?

slammed1 · 02-09-2008, 10:26 AM

Basically they are the same dimension wise and internal with same outer mounting pads for the backing plates and such. Manufacturers didnt change much back when for sometimes 8-10 years or more so that tooling and dyes didnt have to be changed as much in the assembly line and factorys.
I dont see where a kit from a 72 wouldnt work for a 73 myself.

azsmokey · 02-09-2008, 11:35 AM

That is what I thought. However, about a dozen places that I called about a rear disc package said that they did not offer a kit that would work with my 72 K10 (currently a 12 bolt drum.) Many of them did have kits for the 73 though, so I am confused about why they are not interchangeable...

fastom · 02-09-2008, 11:42 AM

Try http://www.classicperform.com/ or http://www.abspowerbrake.com/.

Both places sell a rear disk brake setup for the 67-72.

fastom · 02-09-2008, 11:53 AM

I just looked on www.abspowerbrake.com, it shows a kit for the 71 thru 87. I guess the 72 and 73 are the same.

69halfton · 02-09-2008, 10:33 PM

hate to high-jack the thread.

wasn't the chassis the same from 73 all the way till like 86 or so?

i have a buddy thats got an 86 body on a 79 chassis, and it was done by a guy tahts not that good at fabrication, just nuts and bolts.

....but if i have a coil sprung truck, i didn't think that 73-86 had coil springs anymore?

02-09-2008, 08:24 AM	#1
azsmokey Registered User Join Date: Dec 2007 Location: Glendale, AZ Posts: 156	Difference between 72 & 73 12 bolt? What are the differences, if any, between the 12 bolt rear end in a 72 K10 and a 73 K10? Will a disc brake conversion kit for a 73 work on a 72?

02-09-2008, 10:26 AM	#2
slammed1 1972 Chevrolet SWB Join Date: Jan 2008 Location: FT Smith AR Posts: 512	Re: Difference between 72 & 73 12 bolt? Basically they are the same dimension wise and internal with same outer mounting pads for the backing plates and such. Manufacturers didnt change much back when for sometimes 8-10 years or more so that tooling and dyes didnt have to be changed as much in the assembly line and factorys. I dont see where a kit from a 72 wouldnt work for a 73 myself. __________________ My New thread with pics (not my build thread yet.) http://67-72chevytrucks.com/vboard/s...46#post2573646 1972 Chevrolet 1/2 ton short wide bed,68 frt clip Project. 1980 Camaro Inherited when father passed,68K Miles 2003 Ford Mach1 FUN as Hell!! 2002 Dodge Ram 5-8 slam Rolling BillBoard (Gone not forgot) 2004 Dodge Ram HEMI 10" lifted on 37's and 2wd.

02-09-2008, 11:35 AM	#3
azsmokey Registered User Join Date: Dec 2007 Location: Glendale, AZ Posts: 156	Re: Difference between 72 & 73 12 bolt? That is what I thought. However, about a dozen places that I called about a rear disc package said that they did not offer a kit that would work with my 72 K10 (currently a 12 bolt drum.) Many of them did have kits for the 73 though, so I am confused about why they are not interchangeable...

02-09-2008, 11:42 AM	#4
fastom That's right, it's Copper!! Join Date: May 2007 Location: Bakersfield, Central California Posts: 558	Re: Difference between 72 & 73 12 bolt? Try http://www.classicperform.com/ or http://www.abspowerbrake.com/. Both places sell a rear disk brake setup for the 67-72. Last edited by fastom; 02-09-2008 at 11:42 AM.

02-09-2008, 11:53 AM	#5
fastom That's right, it's Copper!! Join Date: May 2007 Location: Bakersfield, Central California Posts: 558	Re: Difference between 72 & 73 12 bolt? I just looked on www.abspowerbrake.com, it shows a kit for the 71 thru 87. I guess the 72 and 73 are the same. Last edited by fastom; 02-09-2008 at 11:54 AM.

02-09-2008, 10:33 PM	#6
69halfton Registered User Join Date: Apr 2007 Location: King City, Ontario, Canada Posts: 974	Re: Difference between 72 & 73 12 bolt? hate to high-jack the thread. wasn't the chassis the same from 73 all the way till like 86 or so? i have a buddy thats got an 86 body on a 79 chassis, and it was done by a guy tahts not that good at fabrication, just nuts and bolts. ....but if i have a coil sprung truck, i didn't think that 73-86 had coil springs anymore? __________________ - Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.