I recently swapped out my weak 8.8 axle in favor of a 9" out of a 79 F150. now my only problem is that it seams my driveshaft is too short. Im only catching about 1" in the slip yoke. im running factory rear springs with 2" taperd lift blooks of the 79. my truck is an 86 with a np435. i know where there is a 89 with an automatic and a 9" in it would that driveshaft work? i already stole the slip yoke part that attatches to the axle the rest is still on the bronco.