Is there a drain plug and a fill plug? Or will it have to be sucked out and pumped in?

 

on the back side of the case there will be a plug at the bottom (drain) and another about half way up (fill and level ck)

 

Just pull the drain plug and let the oil run into a catch pan.You will have to pump in the new fluid.Realy easy to do.

EDIT: I think its time to change mine again,lol.

 

Before drainig the fluid make sure you can get the fill nut loose. If not you will end up with all the fluid drained and no way to fill it back up without having to go get a bigger ratchet and a cheater bar from friend. Don't ask me how I learned this lesson.

 

What did you guys use to pump the new fluid in?

And it's just ATF right? 99 7.3 4x4

 

"Before drainig the fluid make sure you can get the fill nut loose. If not you will end up with all the fluid drained and no way to fill it back up without having to go get a bigger ratchet and a cheater bar from friend. Don't ask me how I learned this lesson."


Yeah what he said

 

and yes atf small hand pump or bottle nipple

 

XL-12 from Ford is what I use. The reason is becuase for some reason Ford freaked out about the Mercon and Mercon V specifications for their transfer cases and doesn't want us using Mercon V for what ever reason, but nearly all new Mercon ATFs out there are Mercon V. I do think Mobil 1 synthetic universal ATF is specified for both, but just to be safe I've always used XL-12.

 

How often should this be done? Ive got 109K miles and I bought the truck with 89K and never put any thought toward it. Im a fan of amsoil anyone have any opinions on using it in the TC?

 

What he said!! I got 330k on my factory fluid!

 

Yep just ATF and used a hand pump to fill it backup once we got the nut loose.

 

These guys pretty much got ya covered, but if you want to see it, look here.

 

Welcome to guzzle's Transfer Case Fluid Change Web Page

 

IIRC they recommend a 150k interval but I am not sure off the top of my head. My father's truck has 242k miles and I know he has NEVER changed his on this truck or any other truck he has owned. I am not saying it is the best idea but it still works. I have Wally World Dex/Merc in mine, doesn't have the slightly more aggressive friction modifiers as Merc V. I plow so I change mine out annually, definitely overkill but it is only about 2 quarts of fluid so I am not breaking the bank to do this.

AAP and NAPA have simple one gallon bottle pumps that make changing x-cases and diffs sooooo much easier. You waste far less fluid.

 

Mobil 1 Synthetic every 50k here. The fluid will shoot out sideways from the T/C so place your catch pan accordingly.