700R4 had 3 different splined input shafts depending on model usage:
All 4 cyl & 60 degree V6 used a 27 spline input without seal extension.
1982-1986 90 degree V6 and V8 used 27 spline input with seal extension.
1987-newer all 90 degree used 30 spline with seal extension.
1980-1989 200_4R used 27 spline input with seal extension.
All were available in different stall ratios.
90 degree V6 & V8 converters are 12 inch lock-up models.
4 cyl & 60 degree used 10 1/2 inch lock-up models.