Originally Posted by Seckslexia
(written by triple88a)
Thats weird because i changed mine and even at jeffy lube they checked on the computer and it says it should be changed every x miles. NV3550 is the tranny that comes w/ the I6 version.
Direct quote out of the owner's manual for a 2003 TJ Rubicon, page 210 under "Frequency of Fluid Change":
"Under normal operating conditions, the (transmission) fluid installed at the factory will give satisfactory lubrication for the life of the vehicle. Fluid changes are not necessary unless the lubricant has become contaminated with water. If contaminated with water, the fluid should be changed immediately."
So the NV3550 does not need the fluid changed on any regular basis, unless you get water in them.
The TJ's were made for a couple of years with the AX-15 manual transmission behind the 4.0L motors, and they DO require regular fluid changes. That is why we need to know what year the TJ is to tell if the fluid should be changed.