On my 63 F100 I get a vibration on deceleration at 70 and up. New driveshaft made it better. Have a new bushing in the tailshaft. Have a small amount of play in the slip yoke. The truck uses the original bellhousing and front mount setup. The mounts are new. This lets the trans hang with no mount as did the original trans. The T5 is about 8" longer so this changes the shaft angle a minor amount. Opinions. My thoughts are new yoke. What yoke are yall usin? Would a crossmember and trans mount help or would a 3rd mount create a bind.

Thanks

Kenny  Onalaska, Texas