i just got done putting on 3.73 gears pi 9.5 3000 rpm converter and the same transgo shift kit. the gears will work great with the converter. the shift kit is very nice but i hadnt heard of the j-mod either when i did it. i called pi and they ask you lots of question which helps them make a converter exactly to the performance you desire. few words of advice since i screwed up when doing this. get a traction lock differential....get a dennis chip if you want to race. the shift points will be way to high otherwise. and when transgo says full race on their kit they mean it. i cant give any advice on the transmission since i dont know much about them but mine has taken quite a bit of abuse. My 95 4.6 ran 16.5 in the quarter mile with crappy tires launching at 1200 rpm. well have fun and let us know how it goes