Wanted: 71 K20 Brake Drums - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*60apache4* · 09-05-2003, 07:46 PM

I just got back from the machine shop and have bad news. So, I am in desperate need of a new set of rear brake drums for a 1971 Chevrolet 3/4 ton, 4x4 with an Eaton/Corporate Rear Axle.

Apparently this brake drum and hub assembly was only used ONE year. You can check your parts books (Wagner, Bendix), but it won't do any good. The GM parts number from1971 is #3996637.

If anyone knows if I can swap backing plates and use drums from a 1972 I would greatly appreciate it. Please help.

Thanks.

**jerry moss** · 09-05-2003, 08:05 PM

swap the drums, hubs, backing plates etc. from a 2wd 3/4 ton with an eaton rear. it'll all fit and works fine.

*60apache4* · 09-06-2003, 12:40 PM

Thank you Jerry, if anyone would know what to do, you would.

But, a couple things I thought of are will the bolt pattern of the backing plate match up or will I have to drill them to match?

Also, is the spindle on the end of the axle tube the same to match the hubs and bearings?

Thanks for your help...

jose · 09-06-2003, 12:56 PM

You might call them on Monday parts shows they have a set of drums . Parts search doesn't show if drums are for Eaton . They are closed today . I had a hell of a time finding a set about 10 years ago for a 71 4x4 that i had Good luck . Jose

http://www.northverdeautosalvage.com/

mnick · 09-06-2003, 04:18 PM

If you don't have your heart set on drum brakes. TSM mfg
makes a disk brake conversion kit
thier web site is www.TSMMfg.com

69k5 · 11-17-2003, 05:59 PM

i have a set of rear drums off a 72 3/4 ton. pm me if you want em. also though http://www.echobit.com and http://www.azkickin.com both offer 14ff disc kits a lot cheaper than tsm. these will work just fine as it did on mine. everything is the same.

09-05-2003, 07:46 PM	#1
60apache4 Account Suspended Join Date: Nov 2001 Location: Oregon Posts: 147	Wanted: 71 K20 Brake Drums I just got back from the machine shop and have bad news. So, I am in desperate need of a new set of rear brake drums for a 1971 Chevrolet 3/4 ton, 4x4 with an Eaton/Corporate Rear Axle. Apparently this brake drum and hub assembly was only used ONE year. You can check your parts books (Wagner, Bendix), but it won't do any good. The GM parts number from1971 is #3996637. If anyone knows if I can swap backing plates and use drums from a 1972 I would greatly appreciate it. Please help. Thanks.

09-05-2003, 08:05 PM	#2
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,949	swap the drums, hubs, backing plates etc. from a 2wd 3/4 ton with an eaton rear. it'll all fit and works fine. __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

09-06-2003, 12:56 PM	#4
jose Registered User Join Date: Feb 2001 Location: Salem , Oregon 97301 Posts: 1,796	You might call them on Monday parts shows they have a set of drums . Parts search doesn't show if drums are for Eaton . They are closed today . I had a hell of a time finding a set about 10 years ago for a 71 4x4 that i had Good luck . Jose http://www.northverdeautosalvage.com/ __________________ 68 GMC 4x4 SWB jose6772@yahoo.com

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09-06-2003, 12:40 PM	#3
60apache4 Account Suspended Join Date: Nov 2001 Location: Oregon Posts: 147	Thank you Jerry, if anyone would know what to do, you would. But, a couple things I thought of are will the bolt pattern of the backing plate match up or will I have to drill them to match? Also, is the spindle on the end of the axle tube the same to match the hubs and bearings? Thanks for your help...

09-06-2003, 04:18 PM	#5
mnick Registered User Join Date: Jan 2001 Location: xenia,ohio,45385 Posts: 73	If you don't have your heart set on drum brakes. TSM mfg makes a disk brake conversion kit thier web site is www.TSMMfg.com

11-17-2003, 05:59 PM	#6
69k5 Registered User Join Date: Nov 2003 Location: Monroe, La 71202 Posts: 317	i have a set of rear drums off a 72 3/4 ton. pm me if you want em. also though http://www.echobit.com and http://www.azkickin.com both offer 14ff disc kits a lot cheaper than tsm. these will work just fine as it did on mine. everything is the same.



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