Replacement Output Shaft
NP203 and NP205 transfer cases commonly came behind TH350 transmissions, but they never came behind 700R4's. The 700R4 shares the 27 spline output and 4 bolt pattern with the TH350 but it's output is about 2" longer. To adapt a 203 or 205 to a 700R4, you can install this shorter output shaft OR use this spacer. Once the length is taken care of the TH350 parts will bolt right up.
Installation requires pretty major surgery on the TH700, so you might want to plan the conversion around a tranny rebuild.
Replacement Output Shaft - $160.00 Buy Now
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Doubler™ Dual Transfer Case