I decided to change my differential fluid tomorrow cause my truck is about to hit 90kmi and I dont know if the previous owner ever did or when the last time was. What brand of fluid are yall running (mobile 1, amsoil, ect,ect) and I need to get 75w-90 fluid right? Also how much fluid should I get? Its an 03 2wd with 3.55 gears open diff.
Thanks

 

I use Royal Purple in everything on my truck. A little over 4 pints is how much you need. I think if you do much towing they recommend you use 75-140 in the rear, if not I think the 90 will be fine.

 

They recomend 70w 140 at all times in the rears I believe.
The 70w 90 is if you cant find the 140 cheap enough and is a cost cutting measure.
Al.

 

Yep, 75-140 in mine too.

 

75w-140 is what the book says. 4.9 pts I used Mobil 1.

 

how hard is it to do this ... sounds like something i need to get done as well ...

 

Not hard at all. You can do it in your driveway in about 30 mins. Just remember to clean the magnet off and do a visual inspection while you got the cover off.

 

So I should get 75w-140 cause I thought I only needed 75w-90? I tow a little but not very often. Remember I dont have the lsd.

 

my owners manual says 75w-90. 2002 with the 9.25 corporate rear axle

 

I just finished changing the diff oil a few hours ago. I went ahead and got Royal Purple in 75w-140. Thanks for all yalls help!