Just picked up my '65 6 cylinder from having a T5 installed last week. It gets off the line so much better than with the old 3 spd. However, unless I'm at the perfect speed it grinds going into 2nd and 3rd. Haven't noticed it as much going into 4th but some. My question is do you think this is a clutch problem or transmission problem? I got the T5 on eBay completely rebuilt and all the conversion and clutch components came from MDL. The shifter is a Steeda Tri-ax.