Here goes. Possible proto-type power train. 1986 Sou'Wester 25' has the following: 6cyl Cummins(6tba) turbo , Transmission(Velvet drive I think) and a pre-alpha outdrive. Prop is 19 1/2 X 21p Left. I am trying to pin down the outdrive because I need to replace the upper at least, probably both cases or, if possible, replace outdrive. I will be pulling motor to paint and replace whatever it needs. Has anyone heard of this combination? Drive # is 618242, Transom Plate is A310516. Can't find these # anywhere. Thanks in advance for your help. Bill