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Jan 21st, 2020
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Joined: Jul 2021
Posts: 14
OP
'Bolter
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I have a 66 K20 and can't to find a part number for the rear drum. It's an HO72 with 13 x 2.5 inch brakes, 8 lug. This Eaton housing is the wider version to accommodate single rear wheels. I do have a set of 13 inch drums on my dually Eaton but that housing is an inch or two more narrow and the drums are different. I have piled through the parts books, this website and I have looked and asked on the the other site too where there were several answers but none that led me to the right drum. I have also paid an online visit to suppliers. All drums listed are 11, 12 or 14 inch, no 13's. I wish to keep the original brakes on the truck. Drum brakes work well for me, especially in the rear, so no disc conversion. The old drums I have are not salvageable and any markings that were on them have disappeared with time and weathering. Has anyone had this same issue and resolved it? Appreciate!
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Joined: Apr 2005
Posts: 10,972
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
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Rockauto shows they have drums to fit your application but do not list dimensions.
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”
"I fought the law and the law won" now I are a retired one!
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USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
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Joined: Jul 2021
Posts: 14
OP
'Bolter
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Rockauto shows they have drums to fit your application but do not list dimensions. Yes, you are correct. I have researched them all, none are 13 x 2.5 inch except for the dually drums. Several years back I bought a new set from Rock Auto for my dually rear. Centric brand name. They fit perfectly on the dually but will not work on the single wheel version. The dually drums are quite deep compared to the single wheel version, even though the braking surface is the same. Recently the dually drums are out of stock too...
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Joined: Nov 2005
Posts: 6,094
'Bolter
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Hy Packard Joe, my research this morning shows the first mention of 13" X 2.5" rear brake drums on K20 models as appearing in 1972, Bendix p/n 140363 there is no mention of single rear wheel or dual rear wheel, only one p/n. The first mention of single rear wheel/dual rear wheel I find is the 77-79 K30 w/13" X 2.5" rear brakes SRW p/n Bendix 140387 DRW p/n Bendix 140388. Are you sure this rear axle is original to your truck? If you could give us more dimensions, such as the overall height of the brake drum we may be able to find a drum by dimensions, hope that helps.
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Joined: Dec 2015
Posts: 538
Unconventional Thinker
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Are you the original owner? If not, did someone swap over the 14 bolt axle brakes to the HO72?
Shane
Shane's Toys...
2007 Forester XT Limited (2nd Owner)
1991 Cherokee Laredo (2nd Owner)
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1965 Chevy 3/4 Ton Fleetside (3rd Owner)
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