This is the transmission modulator for many different GM vehicles. This is for the M40 automatic transmissions, Hyrdra-Matic 3L80 / THM400. This is a brand new, factory OEM, genuine ACDelco part, still in the original box. The box is in really rough shape.

GM part # 8629947

Alternate part #'s 08629947 ; 03030843 ; D6108

Item is number 13 in the GM diagram.