I need opinions from you guys out there that either have done this and liked it or disliked it.

I want my truck to get a ll broke in and about 5000 miles i want to switch the trany and rear and front end fluid with synthetic.

Is royal purple that much better then Mobil 1?
Will there be any negatives to switching to synthetic like one of the above mentioned?

 

I think the differentials come with synthetic from the factory.

 

is there a difference in the synthetics out there? Is the stuff they use from the favtory a lesser quality.

sorry for all the newb questions just trying to get it all figured out on the new trucks.

 

The factory trans and diff oil is fine IMO. I wouldn't change it for a while. When you change your engine oil you can go to a synthetic of your choice, I use mobil1 in mine. I think the price/quality is pretty good.