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1973-1973 GMC C25/C2500 Pickup 307 CID
0L V8 427 CID L88
NOTE: If equipped with aluminum heads
Use w/ Billet Aluminum Mount 97-380 - Bolts to Existing Tapped Holes on Left Side Cylinder Head of Gen III Hemi Engines
2009+ GM 4L60E Transmission Control Harness - 558-455 motorcyle-exhaust 1973-1973 GMC C25/C2500 Pickup 307Overview: Expanding on our Transmission Control options from Holley EFI. This new harness 558 455 from Holley EFI provides plug and play transmission control for the 2009+ GM 4L60 when used with a Dominator ECU. The 2009+ GM 4L60E contains an internal turbine speed sensor, which was not on the previous model year transmissions. Additionally, the valve body range selector is wired and controlled differently from the ECU. Features: Built in Relay Must
