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It was a Turbo 400 and it did have an overdrive unit attached to it but I am pretty sure it was not a GearVendors unit. I forget the name, at some point I am sure 89x2 wll chime in with it.
i believe the twin turbos used a TH400 with a gear vendors OD box on the back
someone please correct me if i am wrong
i think it was a pretty high dollar option too
It is a Gear Vendors unit. I know because I bought one from Callaway in the early 90's when they were selling off their Twin Turbo stock. The OD unit is a Laycock that is used on all the GV units, and as well as other OEM applications. Gear Vendors makes the adapters and modifies the OD unit.