[CrashEd]

The 465 has 10 spline output shaft the TH350 has a 27 spline output and the TH 400 has a 32 output.
So to match them the input shaft on a 205 case must be the same spline count.They all 3 take different adapters the 465 and TH 350 use sleeves to connect the input and out put shafts the TH400 has a 32 spline female input shaft on the transfer case. All the older chevy 4x4 stuff is the figure 8 in the early 80s i think it was they went to the round pattern on the adapter on the transfer case side
So here it gets tricky you can change the 465 and TH350 TC input shafts to either the 10 spline or 27 spline but the TH 400 32 spline TC has a bigger bearing for the input shaft you can mill the 10 or 27 spline bearing hole bigger so the 32 spline bearing will fit but can,t go from a TH400 32 spline to a 10 or 27 spline.
The adapter takes up the length difference so the old drive line will work which ever way you go If i remember correctly.
Hope this helps
Ed