th400's come with 32 spline output shafts most common with 4" tail housings.
th400's also come with 27 spline output shafts and long tail housings.
th350's come only in 27 spline output shafts, but they also have a long and short tail housing.
A lot of variations to just guess at right?
Measure everything and go from there, no one on this website can give you a yes or no answer.
same length will depend on short tail or long tail in either version, plus the fact there are long and short type yokes as well.
a vague answer... prolly not.
the th400 uses a different yoke alltogether.
if you ran a short tail 350, chances are you can get the driveshaft shortened.(cheaper of the two)
worst case, if you have a th350 long tail and a 400 short tail, youll need a new tube.
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