Nitro good point on winter driving , if you run your truck in the cold you would be best to run a new sleeve and piston on the hot days, it doesnt matter if you live in the North Pole, for best results the motor should be at room temp. before attempting to start in the first place, under 60deg , the motor is put under more stress than lets say 80deg. The P/S wear quicker under cooler temps because the metal contracts then when summer rolls around the P/S is worn so much that the compression drops because the metal has expanded, Dont get me wrong you more than likely have enough compression to run the truck but for maxium power a new P/S would do the trick , RED