Originally Posted by coldtaco
Ok before the flaming starts about search function, I already did this and read through lots of posts and did not find the answer. So, got a 2002 tracker 2.0 5 speed 4x4. What fluid for the Transfer case? Manual I think states the same as transmission, which should be some kind of syncro type? So I got Royal Purple Syncro transmission fluid. This right? Thanks.
I guess your problem is not knowing how to "phrase your search", because I've answered this question before, so I KNOW there are answers out there.
Royal Purple is a brand - the brand is of little relevance and can be considered personal preference (I use Mobil1 Synthetic if it matters), what is relevant is the weight of the oil (75w90) and the type (GL4), both of which are stated in the manual - there's actually a chart that allows I believe three different weights depending on temperature, but 75w90 runs from the low temp up to a reasonable figure.
Let's talk about GL4 and GL5 oils now as GL4 oils can be quite difficult to find.
GL5 oils are intended for use with hypoid gears such as those found in a differential and contain more extreme pressure (EP) additives than a GL4 - note that word - more - GL4 oils contain EP additives, but not as much as a GL5.
Some GL5 oils use sulphur as an additive and use of such an oil in a manual transmission or transfer case may destroy the brass synchros - other GL5 oils are "yellow metal friendly" and will not cause problems and may be used in a transmission/transfer case safely.
So - is your royal purple the right weight and the right type?