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'91 K1500....Few Questions.

1528 Views 7 Replies 6 Participants Last post by  Scott88
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. 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? How do I determine the gear ratio and if it has a posi? Will 75W-90 synthetic work well?

Dex/Merc in the tranmission?

Maxlife Dex/Merc in the transfer case?

Maxlife power steering fluid?

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!
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Welcome to the club. Besides the normal things like, fuel&air filters, cap, rotor, spark plugs (use A/C Delco's) fluid changes I'd take off the throttlebody and clean top and bottom with a soft toothbrush and throttlebody cleaner(don't use carb cleaner). Take the IAC valve out of the t/body and clean the pintle, they get carboned up with the t/body cleaner also.
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