72 3/4 ton 4x4 rear drums HELP - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**StingRay** · 03-11-2003, 06:18 PM

Hi guys I need help trying to figure out the rear drums for a 72 3/4 4X4 for a guy I know. Here's what we know:

72 truck with a 12" x 2" brake shoe face and the drums are about 5" deep in total. Upon trying to find new replacements he keeps coming up with a drum for 12" x 2 1/2" or slightly larger shoe and they don't fit. I don't know specifically what diff he has or that is exactly the one it came with the truck for sure but it is probably a genuine 67-72 rear diff.

If anybody knows what we need to look for in the parts books to find the correct one it would be greatly appreciated.

da-burb · 03-11-2003, 08:35 PM

in 72 he could have only had 2 differentials. The Dana 60 or the Eaton/Corporate. The Dana 60 drum is held on with 2 screws and slips over the studs like a 1/2 ton drum would. The Eaton drum has the wheel studs pressed through it and into the hub. That is all the help I can offer.

ZOOMY · 03-12-2003, 03:23 AM

LMC has both sets of shoes available......Zoomy

Stout72 · 03-12-2003, 02:35 PM

I did a major brake job last year. Contrary to da-burb's post, my drums were pressed onto the wheel hub studs on my rear Dana 60. Rather than go thru the time and expense to press them off, I got a decent set of replacement hubs from a junkyard donor, and bought brand new drums. These new drums slipped over the studs and are held/centered with two large flat head screws. I also replaced the bearings, wheel cyls, shoes, springs, and master cylinder. I have all the part numbers for the new components if you're interested.

**StingRay** · 03-12-2003, 05:20 PM

After further conversatoin with the guy it sounds like it's an Eaton diff in the truck. Still need help to find the correct drums. I will post this on the main board as well

SoCal71K20 · 03-29-2003, 01:43 AM

Yeah,you got your hands full! I did that on my 71 K20 about a year and half ago.It has original big 10 bolt round covered eaton.
Looking up parts turned out that 71 was an odd ball with 2 inch
wide shoes,and 72 was the one with 2 and a half inch shoes.More
square inch of surface area I guess.Anyway,ended up pulling axles,knocking in new races and bearings in hubs and getting
drums cleaned up.Old shoe rivets had just started to contact
drums.Was rear axle ever changed out that you know of?

red450ih · 03-29-2003, 05:59 AM

The 72's had the 14 bolt full float axle as well. A picture of the rear would help.

Keith

twistedmetal · 03-29-2003, 11:05 AM

Hey stingray,fellow canadian.I'm pretty sure i can help you find them,bus delivery from here wouldn't be too bad either.

03-11-2003, 06:18 PM	#1
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	72 3/4 ton 4x4 rear drums HELP Hi guys I need help trying to figure out the rear drums for a 72 3/4 4X4 for a guy I know. Here's what we know: 72 truck with a 12" x 2" brake shoe face and the drums are about 5" deep in total. Upon trying to find new replacements he keeps coming up with a drum for 12" x 2 1/2" or slightly larger shoe and they don't fit. I don't know specifically what diff he has or that is exactly the one it came with the truck for sure but it is probably a genuine 67-72 rear diff. If anybody knows what we need to look for in the parts books to find the correct one it would be greatly appreciated. __________________ Saskatoon, Saskatchewan Canada

03-11-2003, 08:35 PM	#2
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	in 72 he could have only had 2 differentials. The Dana 60 or the Eaton/Corporate. The Dana 60 drum is held on with 2 screws and slips over the studs like a 1/2 ton drum would. The Eaton drum has the wheel studs pressed through it and into the hub. That is all the help I can offer. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

03-12-2003, 03:23 AM	#3
ZOOMY Senior Member Join Date: Feb 2003 Location: WIS Posts: 1,752	shoes LMC has both sets of shoes available......Zoomy

03-12-2003, 02:35 PM	#4
Stout72 Not my good side. Join Date: Mar 2002 Location: Fairfield, California Posts: 222	I did a major brake job last year. Contrary to da-burb's post, my drums were pressed onto the wheel hub studs on my rear Dana 60. Rather than go thru the time and expense to press them off, I got a decent set of replacement hubs from a junkyard donor, and bought brand new drums. These new drums slipped over the studs and are held/centered with two large flat head screws. I also replaced the bearings, wheel cyls, shoes, springs, and master cylinder. I have all the part numbers for the new components if you're interested. __________________ 72 Chevy K20 Custom Camper, 350/350, 4" lift, dual shock suspension front & rear. Daily driver and a work in progress. 00 Suburban LT 90 Camaro RS 79 Yamaha XS1100 Special (Ol' Reliable)

03-12-2003, 05:20 PM	#5
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	After further conversatoin with the guy it sounds like it's an Eaton diff in the truck. Still need help to find the correct drums. I will post this on the main board as well __________________ Saskatoon, Saskatchewan Canada

03-29-2003, 01:43 AM	#6
SoCal71K20 Registered User Join Date: Jan 2002 Location: Lemon Grove, California Posts: 152	Yeah,you got your hands full! I did that on my 71 K20 about a year and half ago.It has original big 10 bolt round covered eaton. Looking up parts turned out that 71 was an odd ball with 2 inch wide shoes,and 72 was the one with 2 and a half inch shoes.More square inch of surface area I guess.Anyway,ended up pulling axles,knocking in new races and bearings in hubs and getting drums cleaned up.Old shoe rivets had just started to contact drums.Was rear axle ever changed out that you know of?

03-29-2003, 05:59 AM	#7
red450ih Registered User Join Date: Mar 2001 Location: Nashville, Tennessee Posts: 225	The 72's had the 14 bolt full float axle as well. A picture of the rear would help. Keith __________________ GMC

03-29-2003, 11:05 AM	#8
twistedmetal Take it to the limit Join Date: Mar 2003 Location: Manitoba, Canada Posts: 145	Hey stingray,fellow canadian.I'm pretty sure i can help you find them,bus delivery from here wouldn't be too bad either. __________________ 1995 GMC SLE Ext cab 4X4 Z-71 loaded daily driver 87 k25 Fully Loaded inc captain buckets and console,12" susp lift,3" body lift 42"swampers 66 Cutlass 2dr hardtop currently undergoing frame off 55 chev 2dr hardtop awaiting attention 85 Chev silverado 1/2 ton loaded,daily driver(stolen) 80 chev silverado 1/2 ton farm truck 87 S-jimmy V-8,lowered ,Parting out 49 Chev 1/2 parting out parting numerous 73-80 chev trucks 01 Polaris edge X (highly modified) 58 NSU Prima scooter awaiting total restoration

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