Hello all i was replacing the pads on my rear brakes and thought i would give the rest of the vehicle a quick inspection. I found the front tires have major wear on the inside part, 3 yrs ago i replaced them with brand new tires. The driver side is smooth no tread on the inside part of the tire. Last year i replaced the upper and lower balljoints with Moog Problem Solver ball joints and the tie rods looked good still, also replaced the hubs, shocks, and control arm bumpers so what else can cause wear like this? No belt has shown through the tires yet but im afraid to drive too far until i can replace them. Just dont wanna replace them and 3 yrs later im doing it again 1999 Bravada AWD

 

Alignment

 

As newguy said above, take it and get an alignment done.
That type of tire wear is caused by the toe or camber being off.

 

It's customary to get an alignment done after replacing front end parts such as ball joints. Settings can be disturbed, or parts can be different enough to throw alignment off. Just get an alignment done and rotate the worn tires to the rear (or replace them if you prefer).