If their both upper and lowers and their both adjustable, they're probably Rough Country's control arms that TGC is rebadged. Got a link to the arms you could provide?2001offroad5.9 said:
There's nothing wrong with the RC arms. It's a fairly easy bolt in job. No welding, no cutting. Just take the old ones out, adjust the new ones to the correcrt length, and bolt 'em in.
Depending on your fabrication / welding skills, as well as what you plan on doing with the truck, I'd also look into the Dick Cepek Long Arms. They're going to run you about $500 and you'll have to cut the factory mounts off and weld new mounts to your truck. However, you will have a tremendously better ride, and a lot more flex off road with the DC arms vs the RC arms.