I run the Rough Country 4", and my brother runs the 3.5" IRO with ajustable trackbar. I can speak from experience you could live with the stock trackbar at 3.5", but even then my brother has problems with his tire getting pretty close to rubbing his coils, and his swaybar links actually catch on his coils on occasion, so an adjustable trackbar is in the near future. On my 4" I have a rear trackbar bracket which centered my axle great, but I have problems with it starting to bend, and it came loose twice when I first put the lift on. So if you can get front and rear adjustable trackbars I think it'd be in your best interest to get them.
-1993 Grand Cherokee Laredo V8 5.2, Mopar CAI, Borla headers, Borla Y-pipe, Turn down exhaust, 4" RC SA, 33x12.50r15 BfGoodrich Km2, Crown extended brake lines, IRO Double Shear Track bar, IRO HD tie rod, Home made Quick discos, E-fan, Heavy duty harness/9007 bulb conversion, HP30 WJ knuckles lockrite solid cover.
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