Good afternoon gentlemen. My dad recently acquired a 1991 Silverado that has been in the family since new. Basic run down: Regular cab, longbed, 305, Auto, 4WD, 3.42's. 99K miles(no typo) I will have the owner's manual soon, but I had a few questions... What axles did GM use front and rear? Will 75W-90 synthetic work well? Dex/Merc in the tranmission? Maxlife Dex/Merc in the transfer case? Maxlife power steering fluid? How do you advance the base timing on these trucks... The dizzy hard to see. I will be using the grease gun, and replacing the PCV valve, air & fuel filter soon. Does the TBI system need any special attention? I'll get around to the ignition components. Pardon the newb questions... I am familiar with blue ovals. Feel free to point out any other areas that need to be checked out. Thanks in advance!