Slide the slip yolk in the trans till it bottoms.....then pull it back 3/4 to 1", & measure C to C on the caps for the lenght on the shaft. You want as much spline buried as you can get, but just enough room for a little travel & not bottom on the trans shaft. Good 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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