Slide the slip yolk into the trans till it bottoms....then pull it back out 3/4" minimum, to 1" max , & then you can measure c to c on the shaft. im not sure if you have a short or long wb truck, but if you are under 70 or 71 " c to c on the caps, I would look at a 1 pc shaft. best of luck,crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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