i just changed my diff oil and now i'm getting ready to do my trans. i searched and found nothing on this site (tried neo, redline, and royal purple). was wondering what you guys use. seems like i'm torn between the redline mt-90 or the neo 75w90 hd gear oil. thanks, nick

 

red line or x1r





i use either.....royal purple is great as well...

 

I use Mobil 1, because of price and availability.