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Check the length of the two trannys from the front of the case to the end of the tailshaft to determine the need for a new driveshaft. The swap itself is straight forward. Some early bell housings were application specific, but most will accept either the 3-speed or 4-speed. Since you will need a new front yoke, if you need a new driveshaft anyway, consider a 1-piece--1 less u-joint to maintain and eliminate that pesky carrier bearing. You will have to cut the bottom of the crossmember out for clearance. I had one made out of much heavier stock by TruckPro for under $200. Also, the shifter location may be different due to the different lengths of the trannys. Good luck and keep on truckin'.......Jerry
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'68 c-10 long wheelbase fleetside, been in family since new, originally 250 3 speed
Now (389) 350 .060 over 3.75 stroke,Edelbrock Performer RPM 70cc heads and Intake
600 cfm Edelbrock,Small Comp Cams retro-roller cam and roller rockers,9:1 cr, headers, HEI,Old Air a/c, 72 power disc brakes w/stainless lines, 3.42 gear,T-56 6-speed, original paint(what's left of it). Dakota Digital Dash
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