So I have a hughes 700r4 behind a old small block chevy carbed, and was wondering do i need a tci lockup wiring harness to get my converter to lockup? Installation of these TCI 2004R/700R4 lockup wiring kits makes retrofits into non-ECM 700R4 or 2004R vehicles a snap. They allow automatic operation of the TCC in 4th gear under stable engine operation, and disengage the clutch when accelerating or downshifting. Also provided in these kits is a manual override option. These kits are constructed from OEM connectors and oil-resistant wire.

 

You'll need some sort of harness to activate tcc lockup, the tci kit looks nice, or I'm sure that you could make your own

 

Post a link to the kit or shoot me a pm with the link. Myself I have always suggested the kit from painless wiring. It might be the same one but I do not know. The one I have used in the past comes with a switch for the brake pedal, a vacuum diaphragm switch, internal trans lockup solenoid with harness, internal trans pressure switch and the external wiring. If I remember correctly its about $150. HTH Vince