Ya in my 04 Quad I put in:

Rear Diff: 75w 140
Front Diff: 75w 90
Transfer: Max ATF

All from Royal Purple and it makes a difference. You notice it in MPG right away.

I also pumped my tranny, took 22 litres of RP ATF....OWCH but it was worth it. She seems to shift smoother now than she did before.

 

thanks swinger. i donnt have a manual. going rp on everything. already have rp oil and ice in the radiator. now to do the diffs and transfer. how much does it take in the diffs?

 

I bought 2bottles of the 75w90 and 3bottles of the 75w90.

I basically usedmost of the 2 up front and 2.5 in the rears.

3.5 pints in the front and 4.9 in the back i believe is the actual scientific answer...lol.