Upon learning of Wilcap I immediately contacted them and was informed that they did indeed make an adapter kit that allows the use of TH350, TH400, 700R4, or 4L60 series transmissions behind '55 ...

The kit, which retails for $2,495.00, includes a TH400, Streetmaster torque converter, trans mount, dipstick, transmission cooler, and a case of fluid. Follow along as we swap out the old trans ...

That's where we got lucky and found the TransGo HD2 kit for ... Run Transmission in Ypsilanti, Michigan, the 4L80E was introduced in 1991 as a replacement and advancement of the TH400.