HO72 drum removal - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ml68nova · 03-13-2008, 02:31 PM

I have a 72 c30 wrecker dually with the HO72 rear.

I`m getting information and parts together to do the breaks this spring before I start towing my race car with it. leaking wheel cyl.

What`s the proper way for removing/installing the drum. Just ran a search and not much info on this. I can figure it out I just don`t want my tires/drum/ axle assm passing me at hyw speeds.

Doing a search the socket I need is the KDT2770 correct?

From reading, the shoes, wheel cyl ect..I can get from say napa or the like but prob special order.

The drums are a "good luck finding" item, but My truck only has 20K on it so I`m guessing the drums should be find.....Yes 20k, the original owners, a auto body shop never really used it, and the drivetrain, motor and such lead me to believe it`s true.

Thanks,Mark

Longhorn Man · 03-13-2008, 03:18 PM

You better replace everything in there that you can. Cylinders, springs, adjusters, mounting kits.
My SRW HO72 ended up costing me way more than drums have the right to. They stopped making everything for mine a long time ago.
Lets put it this way... $500, I still have old front shoes, 1 old brake cylinder, 2 old adjusters... and all 4 drums.

ml68nova · 03-18-2008, 08:29 PM

Ok so the tool I need is the KDT 2770 or any brand 4 Wheel Drive 1/2" Square Drive Spindle Nut Wrench?

Can anyone lead me to the correct way to remove/ install these drums for the dually rear.

Thanks,
Mark

shifty · 03-18-2008, 08:33 PM

What is the diff'ce between an HO72 drum and any other drum?

Every drum I've ever removed was as simple as "take off the wheel, smack the living bejeezus out of the drum between each of the lugs with a BFH to free it up, when it starts moving (breaks free), pull it off..." Once the actual drum is off, you can remove all of the internals. You gotta pull the axles in order to swap out the backing plate, though.

Old Chevy Mech · 03-18-2008, 08:41 PM

If the HO 72 is like the HO52 then you must pull axel, then hub. Drum is attached from the rear side of the hub by the lug studs.

Frank

Longhorn Man · 03-19-2008, 01:59 AM

shifty, most full floating hubs are like this. The 1/2 ton semi floating style is normally a smack and pull, and that continues on to modern vehicles too.

shifty · 03-19-2008, 02:13 AM

cool, learn something new every day! i'm gonna go hit google and do some reading

Longhorn Man · 03-19-2008, 02:32 AM

there are some full floaters that have slip on drums... but they are not the norm.

ml68nova · 03-19-2008, 04:52 AM

ok back on subject

Could someone lead me to a web site or thread on how to remove the drums.

my searching isn`t amounting to much.

Thanks,
Mark

shifty · 03-19-2008, 08:42 AM

http://67-72chevytrucks.com/vboard/s...d.php?t=210549

you started the thread

ml68nova · 03-19-2008, 10:58 AM

So I did thanks

I remember that web site but now it`s pay, I was hoping to find more info and pics on how to do it.

03-13-2008, 02:31 PM	#1
ml68nova Registered User Join Date: Oct 2005 Location: Wilmington,DE Posts: 29	HO72 drum removal I have a 72 c30 wrecker dually with the HO72 rear. I`m getting information and parts together to do the breaks this spring before I start towing my race car with it. leaking wheel cyl. What`s the proper way for removing/installing the drum. Just ran a search and not much info on this. I can figure it out I just don`t want my tires/drum/ axle assm passing me at hyw speeds. Doing a search the socket I need is the KDT2770 correct? From reading, the shoes, wheel cyl ect..I can get from say napa or the like but prob special order. The drums are a "good luck finding" item, but My truck only has 20K on it so I`m guessing the drums should be find.....Yes 20k, the original owners, a auto body shop never really used it, and the drivetrain, motor and such lead me to believe it`s true. Thanks,Mark

03-13-2008, 03:18 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: HO72 drum removal You better replace everything in there that you can. Cylinders, springs, adjusters, mounting kits. My SRW HO72 ended up costing me way more than drums have the right to. They stopped making everything for mine a long time ago. Lets put it this way... $500, I still have old front shoes, 1 old brake cylinder, 2 old adjusters... and all 4 drums.

03-18-2008, 08:29 PM	#3
ml68nova Registered User Join Date: Oct 2005 Location: Wilmington,DE Posts: 29	Re: HO72 drum removal Ok so the tool I need is the KDT 2770 or any brand 4 Wheel Drive 1/2" Square Drive Spindle Nut Wrench? Can anyone lead me to the correct way to remove/ install these drums for the dually rear. Thanks, Mark

03-18-2008, 08:33 PM	#4
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: HO72 drum removal What is the diff'ce between an HO72 drum and any other drum? Every drum I've ever removed was as simple as "take off the wheel, smack the living bejeezus out of the drum between each of the lugs with a BFH to free it up, when it starts moving (breaks free), pull it off..." Once the actual drum is off, you can remove all of the internals. You gotta pull the axles in order to swap out the backing plate, though. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

03-18-2008, 08:41 PM	#5
Old Chevy Mech Keepin it runnin! Join Date: Oct 2007 Location: Deep River, CT Posts: 1,036	Re: HO72 drum removal If the HO 72 is like the HO52 then you must pull axel, then hub. Drum is attached from the rear side of the hub by the lug studs. Frank __________________ 1970 K-5 4X4 Blazer 1970 K-20 4X4 Long Bed "Liberty Means Responsibility, that is why most men dread it"

03-19-2008, 01:59 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: HO72 drum removal shifty, most full floating hubs are like this. The 1/2 ton semi floating style is normally a smack and pull, and that continues on to modern vehicles too.

03-19-2008, 02:13 AM	#7
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: HO72 drum removal cool, learn something new every day! i'm gonna go hit google and do some reading __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

03-19-2008, 02:32 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: HO72 drum removal there are some full floaters that have slip on drums... but they are not the norm.

03-19-2008, 04:52 AM	#9
ml68nova Registered User Join Date: Oct 2005 Location: Wilmington,DE Posts: 29	Re: HO72 drum removal ok back on subject Could someone lead me to a web site or thread on how to remove the drums. my searching isn`t amounting to much. Thanks, Mark

03-19-2008, 08:42 AM	#10
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: HO72 drum removal http://67-72chevytrucks.com/vboard/s...d.php?t=210549 you started the thread __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

03-19-2008, 10:58 AM	#11
ml68nova Registered User Join Date: Oct 2005 Location: Wilmington,DE Posts: 29	Re: HO72 drum removal So I did thanks I remember that web site but now it`s pay, I was hoping to find more info and pics on how to do it.



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