replace the front speakers, the dash comes apart fairly easily. We put some nice cdt comp's in my buddys 92 yj and it took maybe an hour including wiring an amp.
and the sound you will get from something in front of you is much better than frmo behind.
97 TJ Sport, 5 Speed. 2.5 RC Spring Lift, 1.5 BL. 33" Trxus MT.