they use the same main case on the tranny, but with a different tailshaft and housing. it looks like they bolt dirrectly to the xfer case. should be a drop in for your 69. i've got two of those and six or seven two wheel drive types. chevy thought they were tough enough to put in full size 1/2 ton trucks, what does that tell you. they are not as tough as the sm465 though. tom
