If you don't install the jack, the bolt may cut due to the high work load of upper arm mounting bolt.

Install the component with the specified torques.

When installing the bolt, install the upper arm in no-load condition by using the transmission jack.

Install the rear upper arm to the sub frame using a bolt in horizontally aligned condition.

If tightening the bolt without aligning the bolt holes of rear upper arm and sub frame horizontally, the bolt securing the rear upper arm to the sub frame may come loose and as a result of this, rust and noise may be able to occur later.