The output shaft is at the opposite end of the transmission from the input shaft. All 700s have output shaft with 27 splines, same as 350s, 4L60s, some 400s, and a few other automatics.being that I am a novice at automatics I counted the splines on the output shaft. The longer of the two shafts on the front. 30 splines on the long shaft. The shorter shaft has 27 splines. The longer shaft must be the output shaft.