Definately stick the back one on, it improves the handling and also centres the diff. You may need to check for clearance on the chassis (dont know the TJ well enough) as on the JK they can foul at full stock rebound position so extended bumpstops may be required.
For the front, as Steve said an adjustable track bar will pull the diff back to centre. At 2in lift though you are prob only looking at about 5 to 7 mm sideways, so you prob wouldnt even notice it unless you have wider tyres that just fit under the guards. On my JK I have about 70mm lift on the front from stock and the diff was about 10mm off to one side, so the adjustable trackbar pulls it back to centre. Again on the JK, the front drop bracket cant be used unless you are over 3 in of lift due to clearance issues, as you need to put 3in bump stop extension in.
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Cheers, Dave :)
2010 JK, then a 2015 KL Trailhawk, now a 2017 GC Trailhawk!
Over 5000 Club
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