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Fluid Fill and Drain Locations
 

So, you have decided to save a few dollars (not to mention the piece of mind knowing that it was done correctly) and do the transfer case or transmission fluid change yourself.  When you crawl under the vehicle, you can get somewhat overwhelmed at all of the places that look like they might be a drain or fill hole.  While this page is far from capturing every vehicle, I'll try to add to it as time goes one so that all of the folks doing Maintenance 101 will have some help in identifying the right place to pour the new fluid.

One thing to remember when doing your fluid replacements....make sure you open the fill plug first.  That way, you know you will be able to put fluid into it once you pull the drain plug and all of your old fluid has drained out.  I've heard from a few folks who drained first and then discovered they could not get the fill plug open.  DOH!
 

NP231 Transfer Case in '98 TJ 4.0L


This view is from the rear of the TJ, looking forward.  The t-case is located right at the rear of the cross member (big skid plate) and has the rear drive shaft connected to it.  Both the fill and drain plugs use a 10mm Allen wrench.  From the factory, they are really cranked in tight.  I had to use a 1/2" impact wrench to get one of them out.

 

AX-15 5 spd manual transmission in '98 TJ 4.0L

The AX-15 fill plug is located on the driver's side of the tranny, near the front of the skid plate and about half way up the side of the transmission housing.  This view is take laying on your back, with the front drive shaft just above your right shoulder with the top of your head towards the front of the vehicle.  It uses a 15/16" socket or wrench.


AX-15 5 spd manual transmission in '98 TJ 4.0L

The drain plug is located on the passenger side of the tranny, near the bottom of the transmission housing, just above the front end of the skid pate.  This view is the same as the picture above, but you are looking up at the passenger's side of the tranny instead of the driver's side.

 

As I don't have an AX-5 to take a picture of, you'll have to settle for this drawing.  This would be viewed from the driver's side of the vehicle (the front of the vehicle is to the left of the drawing). 

 

 

 

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