I recently just bout a trailblazer and I wanted to do a offroad build. I already found a lift and some rims I want to get but I didn't know that every trailblazer didn't have locking diffs. I looked for the code in my glove box and mine has the GU6. I don't really know what that code is for but I'm assuming I don't have the locking diffs. Is there any aftermarket solutions or am I just stuck with what I got?