Well I just gave the old girl a service and ever since then she sounds like shes always under a load while accelerating. There isn't a noticeable loss in power but ever since the service it's seems to have gotten worse. Maybe the trucks just tired but it's only got 110500 miles on it. I use Mobil 1 motor oil and have been since I have owned her, I changed the transmission fluid, transfer case fluid (used royal purple ATF for both) and used Lucas for the rear differential. Also in the past week it's developed a bad lifter tick any idea why this would be happening?