hi, i always use the org 63-64 push putton trunion trans ,and put the 65 slip yoke tail shaft on.put the turbo action valve body in, with hp rebuid, it works fine.use all orig cables etc.the 65 big block trans are going for as much as 450. for core i have 2- 65 tail housing, and shafts cleaned,painted , new seal installed, ready to bolt on for $200.00 plus shipping. just a thought ? will be at the all mopar sled city swap meet at hillard ohio next sat 1/31 franklin county fair grounds thanks