Check your brake pads
I think you'll find it's your disc brakes. Either they have been reassembled wrong or the pads are worn and now after the dis-assembly and then re- assembly the disc brake pad wear indicator is rubbing on the disc rotor telling you you need to change the pads. This indicator is a piece of metal that rubs on the rotor making a horrible noise. That's what it's meant to do.
As mentioned below a sight variation in tension won't cause the problem but you should use a torque wrench and follow the specifications when doing any of these maintenance jobs. The Torque Specifications are easy to get hold of on this forum.
XH V6 3 liter diesel Commander: R/H steer, 2 1/2"OME rear lift, 3" front lift - Murchinson coils with steel spacers on top of struts, JeepinByAl upper control arms, Bilsien shocks, GDE chip, Custom low profile transmission cross member, Black alloys, 32 1/2" rubber , Provent crank case filter, custom rockrails, Custom rear bar, Custom front bar with driving lights, custom front bash plate, 12000lb recovery winch, aftermarket CD/Nav/DVD/Rear Cam system, Interior LEDs, HID lights