Has any one ever swapped the three speed tranny out of their CJ for a 4 speed with the granny first gear. My son has a NP 235 in his early Bronco and it works great. A friend of mind has a 74 CJ with a 304 in it that we want to find a 4 speed transmission that will work in place of his 3 speed that will fit the bell housing and t case?? He asked me for my advice on building up his jeep and I told him this would be a good addition if we could find a tranny that would work.