Hypercoils 13" Rear Coil Spring - 5" O.D. - 300 lb. H77403FXXL GMC TH400 Automatic Transmissions

GMC TH400 Automatic Transmissions

1980-1990 Chevrolet Caprice

steel plates permit installation without changing or modifying the input shaft or throw out bearing

The spark plug has been relocated closer to the exhaust valve for improved performance

Hypercoils 13" Rear Coil Spring - 5" O.D. - 300 lb. H77403FXXL GMC TH400 Automatic TransmissionsHypercoils are manufactured from the highest quality chrome silicone steel and high tensile chrome silicone steel available in the world. The material used in producing Hypercoils undergoes two separate magnaflux inspections. Once before manufacture and again after coiling. These inspections insure the wire is free from surface imperfections which, if gone undetected could lead to spring failure. The life of a suspension coil is directly related to