What do I have to do to my 71 challenger 318/904 driveshaft to make it work on my 340/727 swap. I have a 489 8 3/4 rear end now. The original rear was a 741 case. Thanks in advance again!

Sorry for the repost in other thread


2016 Diesel Ram 3500 Mason Dump
1971 Challenger
2013 Jeep Wrangler
1979 Dodge Ram Power Wagon 400 Mini Pumper
My other car is a Fire Truck.