Narrowed down the clicking

I had a brand new flywheel, King Cobra Clutch, High Alloy T-5 from Astro Performance, Ford Aluminum Driveshaft, Pro 5.0 shifter and BBK Adjustable Clutch Quadrant installed last week. Well every gear is fine except for reverse. Well there is a loud clicking noise coming from the tail housing of the tranny where the driveshaft yoke goes into the tranny when the car gets to about 3-4 mph. Keep in mind this only does it in reverse and is fine in every other gear. Any ideas or help would be greatly appreciated.
Thanks!
 
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