Hmmm, that's odd. This will be important if you decide to go with larger tires. If you have 3.55s you will hate big tires. An easy way to tell is put the truck in neutral, jack the rear of the truck up by the rear differential, so the tires are off the ground. Make a reference point on your drive shaft as well as one of your rear tires. See how many turns of the drive shaft it takes to get one full revolution from the rear tires. 3 1/2 turns = 3.55, 4 turns = 3.92.Nope, no sticker in the glovebox; I just went out and looked. Yeah, I will be changing all fluids besides oil which was just changed..
This is my first truck, so I am new to differential and transfer case changes.... Any help would be appreciated! Thanks
This is also a good time to check and see if you have LSD. Turn one of the rear tires while looking at the other one. If they spin in the SAME direction you have LSD, if they spin in OPPOSITE directions then you have an open differential (or a worn out LSD).