4 Speed O/D???????

That sounds like one of the New Venture NV3500 5 speed trannies. This is an internal rail tranny with the shifter coming right out of the transmission. It will likely require some serious modifications to the floor to fit. Unlike the TKO Kiesler provides with there kits the shifter is in a fixed position so take some measurements to make sure you don't wind up with the lever coming through the floor in the back seat! ;)