I have a 2004 lly 4x4 with 10k miles. I am running delvac 1 under the hood with a wix filter. At what point do I really need to change the fluids in the diffs??? I tow a 30ft gooseneck once a week. Also what brand and grade should i be using?One more...What about the transmission spin on filter... every time i crawl under that beast somthing inside me needs to change that bad boy..I have read the manual, and wasnt clear about when and what to change on that thing...Thanks for your help..Jason:eek:

Look for the Maint list coming soon... It will answer all your questions.

Hopefully very soon it will be up!

Any info on that maint list??? I need to change my diffs also.