you can swap them, but you will need to completely "gut ' both trannys to do the job. The tailshaft is the 1st pc to go into the case!. just a thought.....you might think about a shorten & balance on the D 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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