Summary of 4.0 belt tensioning setups (LHD, don't know about RHD myself):
Up through 95: adjusted via the PS pump. Loosen 3 bolts + locknut, then adjust tensioner bolt.
96-98 zj + xj up to 01: tensioner pulley below PS pump. Loosen locknut, then adjust tensioner bolt (change required re-routing belt, removing 1 idler near alternator, adding tensioner pulley, new mounting bosses cast into intake manifold to accept direct mounting of PS pump)
99-up (wj + some tj): spring loaded tensioner near alternator. Belt was re-routed, alternator raised, a/c comp relocated below PS pump.