I had posted awhile back about using amsoil Severe Gear 75W90 in the Ranger, which yall all said would be fine, but it got me thinking would I be better off using 75W110? I might try Redline gear oil next time.Last week I changed my axle bearings and seals with the help of a friend, which was easier than i thought. filled it up with Amsoil 75W90, and ill run this for the time being. The reason I asked about the 75W110 is that most of the time spent driving this truck, which is my daily driver, is a speeds of 60-70 mph, rpms between 2200-2600. Although I did talk with someone at Amsoil and they said I would see a fuel mileage due to the thicker oil, and less heat dissipation. I dont tow anything at all, I shift in every gear around 2500-2800 rpm and the fastest I go is 70. So what do you guys recommend, and what kind of interval should go with? Amsoil states 100k but I dont feel comfortable with that. Also how often should I change out the Pennzoil Synchromesh in the 5 speed? Last question, how hard is it to change u-joints on the driveshaft? Mines are not bad but I cant get the grease gun on the fitting and for peace of mind, I figured I'd change them.
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