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350, 4 bolt main. Running 10w30 right now as I just got it back about a month ago.

I do my own oil changes. I don't trust anyone else to do them as the last time they stripped the oil pan bolt on my old 65 Suburban Carryall. Anyways I was just curious about the oil I should use.

Cottonwood, 50 miles south of Flagstaff.w get in the 30's inte winter and up to and above 110 in the summer

The engine really isn't that old. It's not the original from 84. If I remember correctly it's a 1999. It's a crate motor a friend ule out of his 72 C10, and sold to me

I have an 84 GMC Sierra and just had another engine put in, and the mechanic said run 30 weight in it all the time. I usually do 40 weight, of 15w40 Rotella since it is a used engine. I live in Arizona so would it hurt to go to a 15w40 all the time, and go up to a 20w50 in the summer or just...

I got the issue fixed yesterday. I have male and female connectors on the wires, so when I take the bed off to fix the front panel I can just disconnect the lights. I replaced those, but found out it was the new 1157 bulb that was the problem. I found an old one, put it in the socket, as well as...

I'll spend some time under the truck tomorrow. I did replace both taillight housings a couple years ago but they were fine until last year. I'll see if I can get the harness out and look for mud/dirt in the connectors as well as any breaks.

I have an 84 Sierra 2500 that's having some rear light issues. Left side brake, tail lights work but the right side is dim, slow blinking and when the hazards are on, they alternate like a police car. Fronts on all work as they should. I'm guessing it's a grounding issue? I have a new turn...