Gearvendors sent me one of their standard adaptors, with the front flange (that would normally bolt to the tranny) undrilled. I got a piece of 1" thick aluminum plate. The plate has to be a bearing retainer, so I had to router out a double lip, on the tranny side, to hold the bearing firmly up against the tranny. I used 1" thick so I could recess to flush, 3/8" allen bolts. In fact, I chucked the shaft of them into a handrill, and then ran the head up against a grinding wheel, on a grinder, in order to make the heads a little smaller. I've just made the pilot holes in the flange, and next I'll put it up against the adaptor plate, mark one, then drill and tap that hole, on the plate, and drill the hole in the adaptor bigger. Then I'll bolt it up, and drill and tap the rest of the holes.Anyway, point is, it can be done.Ran across 3 guys at G.V. who either didn't know what a T-98 or a Divco is, and didn't care, and tried to sell me a bunch of stuff I didn't need, or told me it couldn't be done. Then I talked to a guy who was able to set me up. Does your 3-speed have a 10 spline output shaft? I suspect that just as the T-18 (granny 4 speed) and the T-19 3 speed have similar cases, output shafts etc. that the T-98 and its 3 speed counterpart (T-97?) are also very similar.Jim