Ok thanks for the info my truck has 62000 on it is that too soon to be changing all these fluids.I used the royal purple gear oil when I did mine this summer. I'm not sure where you are located but I get mine from mopac in calgary, there's also one in edmonton. You can also order amsoil, it's probably the best, but you can also walk into can tire and pick up the shell rotella great oil and it's a good one in a pinch.
Ok how much money in oil and gaskets to do front and back do you think.Honestly, yes. Unless you've cooked your fluids there should be no reason to change them out until 100-130,000kms. I'd swap tranny fluid at 60k and do new plugs, but not much else would really need to be done. Gear oil is extreme duty oil by nature, so it can go a long time before needing to be replaced. Now, there's nothing that says you don't have to swap the fluid for better stuff like a quality synthetic, but it's not a must. If it's a new-to-you truck, then it might not be a bad idea, just so you can open up the cases and see what kind of wear you have going on in them.