GM 3981987 Spring Unit – NOS in Original GM Box
Description:
GM 3981987 Spring Unit – NOS in Original GM Box
Genuine GM 3981987 spring unit, New Old Stock with original GM packaging. Correct for drum brake hardware assemblies across a wide range of 1968–1978 GM passenger cars and light trucks. Includes color‑coded springs used for brake shoe return, hold‑down, and parking brake actuation depending on model.
Identification
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GM Part Number: 3981987
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Group: 5.026 (Brake – Drum Hardware)
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Type: Brake Shoe Return / Hold‑Down Spring Unit
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Era: Late 1960s–1970s GM
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Condition: NOS with original GM box
This part number appears in GM’s brake hardware group, used for drum brake assemblies on passenger cars and light trucks.
📐 What the Part Does
The spring unit is part of the drum brake hardware kit. Depending on the specific model, it may serve as:
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Brake shoe return spring
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Brake shoe hold‑down spring
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Parking brake actuation spring
GM packaged these as “spring units” when multiple color‑coded springs were used in a single service kit.
🚗 Specific Applications (GM Family)
Based on Group 5.026 usage and period catalogs, 3981987 fits:
Chevrolet
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1969–1977 Camaro
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1968–1977 Chevelle / Malibu
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1968–1979 Nova
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1968–1974 Impala / Caprice
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1971–1977 Vega / Monza
Pontiac
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1968–1977 Firebird
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1968–1976 LeMans / Tempest
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1968–1974 Catalina / Bonneville
Oldsmobile
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1968–1977 Cutlass
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1968–1974 Delta 88 / 98
Buick
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1968–1977 Skylark / GS
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1968–1974 LeSabre / Electra
GMC / Chevy Trucks
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1968–1978 C/K light trucks
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1971–1977 Suburban
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1971–1977 G‑Series vans
This part number appears in multiple GM brake hardware kits, so it’s widely compatible across GM drum brake systems
Features:
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Authentic GM service part
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Correct for Chevrolet, Pontiac, Oldsmobile, Buick, GMC
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Ideal for drum brake restoration or concours builds
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Includes multiple springs as originally packaged
Condition: NOS – springs are mint; box shows light shelf wear.
