I'm sorry to report (about $40 worth!), that after about 500 miles on the truck after switching to Amsoil 75/140 in my LSD differential due to frequent towing applications (no friction modifier was added). I now find my LS function is not working...
Prior to the switch, I experienced occasional "chirping" of the inside tire over loose or irregular surfaces when turning sharply - and more noticeable when both tires were on loose surfaces - I had been suspicious when that tendency disappeared after the lube switch. But today tried placing one rear wheel on a grassy, muddy area, and the other on a solid dirt road, and it just sat there spinning the wheel on the muddy surface...
(sigh!)
Guess I'll hafta drain it out (thank God for the drain plug I installed in the differential cover!), and try replacing it with the equivelent dino product... And yes, I did all "figure 8's" and recommended stuff...
We all learn - some of us just learn SLOWER than others...
