Were there any differences in the MP231 and AX15 length? Im my 1990 Comanche the previous owner tried ot swap in a auto. I put a standard back into it and the driveshaft is about an inch too short. Were there any differeces in lengths of the AX15 and NP231? It is the original shaft. My local shops are quoting $175 to lengthen the shaft, and id like to pass on that.