GM TH700-R4 / 4L60E CHEVY IMPALA EXTENSION HOUSING, 2WD CASTING # 8673409
Manufacturer Part Number: 8673409
The GM TH700-R4 / 4L60E 2WD extension housing with casting # 8673409 (or 8673409-1) is a 2-wheel drive tail housing with a 2-1/8” speed sensor hole, fitting a wide range of GM vehicles from 1982 to 1996. It is primarily used on Chevrolet Impala, Camaro, Caprice, and various trucks/SUVs equipped with 700R4 or 4L60E transmissions.
Key Compatibility Details:
- Transmission Types: Fits 700R4, 4L60, and 4L60E (2WD only).
- Year Range: 1982–1995/1996.
- Common Applications:
- Chevrolet: Impala, Caprice, Camaro, Corvette, Silverado/C1500.
- GMC: Sierra/K1500.
- Features: Includes 2-1/8” speed sensor hole.
This casting is a versatile component for 2WD passenger cars and light-duty trucks during these model years. It often features a mount boss for specific chassis applications.




















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