Today I used my 4H for the first time. I noticed a clunking sound whenever I let off the gas. When I pressed the gas pedal the clunking would stop. Any ideas?
Mine does this too. My 18 JL never did it so I thought it had something to do with me not giving my JT enough throttle being it's a manual transmission.
It is probably just backlash in the drivetrain gears. As you let off the gas, the power flow reverses in part of the drivetrain instead of going engine -> wheels it starts going wheels -> engine (stopped only by the clutch or torque converter), so the gears probably clank a little bit due to the play.