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02-13-2026, 11:30 PM
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#1 |
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Junior Member
 
Join Date: Dec 2024
Location: Atlanta, Georgia
Posts: 27
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Source for Replacement Rear Drum Backing Plate
New to me 1978 axle set...rear drum backing plates are crusty...thought I'd replace, but looking at the Dr Google search results, maybe these are NLA?
TIA for your response.
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Gone fission |
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02-14-2026, 04:16 AM
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#2 |
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Registered User
Join Date: Jun 2013
Location: Somewhere
Posts: 3,363
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Re: Source for Replacement Rear Drum Backing Plate
Learn to speak in sentences?
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02-14-2026, 10:31 AM
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#3 |
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Junior Member
Join Date: Dec 2024
Location: Atlanta, Georgia
Posts: 27
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Re: Source for Replacement Rear Drum Backing Plate
Well, thank you for that Franken...guess I'll just have to put you in the category of 'I don't have an an answer or suggestion, but I'll be an English/Grammer critic'.
Not all who type and speak the English language are required to meet your standard. The message is quite clear.
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Gone fission |
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02-15-2026, 07:54 PM
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#4 |
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Registered User
Join Date: Jun 2014
Location: Reading, PA
Posts: 217
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Re: Source for Replacement Rear Drum Backing Plate
I understood fine, but can't help. I suppose if they don't have holes or rusted out I'd wirewheel and paint.
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02-15-2026, 07:58 PM
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#5 |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 5,049
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Re: Source for Replacement Rear Drum Backing Plate
Need a few more bits of information.
Axle type? 10 bolt, 12 bolt, 14 bolt .... Axle production stamping alphanumeric code. Drum size?
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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02-16-2026, 10:07 PM
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#6 |
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Junior Member
Join Date: Dec 2024
Location: Atlanta, Georgia
Posts: 27
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Re: Source for Replacement Rear Drum Backing Plate
I'm a few hundred miles away tonight, but will post the stamped numbers when I return.
Knowns = 11" diameter with 2-3/4" wide shoes.
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Gone fission |
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02-18-2026, 10:25 PM
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#7 |
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Junior Member
Join Date: Dec 2024
Location: Atlanta, Georgia
Posts: 27
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Re: Source for Replacement Rear Drum Backing Plate
It is a 12 bolt GM rear axle.
Numbers cast in the housing are GM66 and 3896838 with an N. I looked on the passenger side axle tube for stamped numbers, but apparently the paint on there is a bit too thick?
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