There's a tension pulley too. Depending on your climate and all, you may find that it doesn't want to slide on its pin and thus have the tension adversely affected. It's kind of like how a brake caliper gets stuck on its pins over time and weather.

On the outside/frontside, don't forget new drive belts.

Big Truck: 00, 3.5, Endeavor, 5-Spd drive line in hand!
Little Truck: 87, 2.6T I/C, MT, LSDs, Tonneau Top
Her Truck: 03, 3.8, 20th Anniv, 65k
Daughter's: 06 Eclipse, Keeping it Mitsu!
FSMs: MitsubishiLinks.com