I am getting together a 686 that had broken the 7" TA Pressure plate and the TA clutch disc was bad as well. I got a sprag type TA, the HD 9 spring Pressure plate and the 4 pad clutch disc for it and a new TA clutch flywheel.  After getting it all together I bolted the TA housing to the rear end and tried the TA lever after connecting the linkage. That TA lever is WAY stiffer with the 9 spring pressure late over the 6 spring. And in TA it's not releasing the clutch disc. You should be able to tu