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#1 |
Senior Member
![]() Join Date: Dec 2002
Location: Portland, Oregon
Posts: 901
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Raer Drum Brakes
Installed new brake shoes and wheel cylinders on rear of '71 rear wheel drive pickup. Drums are slighly different!! Left drum has casting no.- 3982297; Max Dia 11.09 and is 3 5/8 depth.
Right drum has casting no.- 3989541; Max dia 11.09 and is 3 7/8 depth. Note there is a difference of 1/4" in depth !! I called the local GMC dealer; parts dept. and was told the drums were discontinued and the last part number on reference was 3984855. !!!! As the left drum is badly scored , I desire to replace it... but my question is :- what is the right drum to use and does the 1/4 depth difference matter...( I would think it would !) The depth measurement I am refering to is the maximum outside measurement. Also is there a range of barke drums that are interchangable. example '70 thru '79, maybe... Any help is sure appreciated......Jim
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'71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal). |
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#2 |
Registered User
Join Date: Feb 2003
Location: The Rubber City
Posts: 5,498
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is your truck 1/2 or 3/4 ton?
just askin cuz if its a half ton, should have the 12 bolt...if its a 3/4 ton it should have the dana 60... if its a dana 60 I could check mine, I think it would be the same.
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1969 GMC K2500 ![]() 1996 Honda Accord 2007 Kawasaki KLR 650 |
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#3 |
Senior Member
![]() Join Date: Dec 2002
Location: Portland, Oregon
Posts: 901
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truck is 1/2 ton..... and has 5 bolt brake drums.....
__________________
'71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal). |
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