A downhole tool coupling system, comprising a drive stem, a sleeve, and a plurality of locking clamps. The sleeve is longitudinally movable relative to the drive stem. The locking clamps are at least partially encompassed by the sleeve. The locking clamps are adjustable between an open position and a locked position. The sleeve is oriented relative to the locking clamps to adjust the locking clamps from the open position to the locked position as the sleeve moves longitudinally from an upper position to a lower position. Each locking clamp has an interior recessed region configured to clamp the drive stem to a tool stem when in the locked position.