Logan Lanfear

A synthetic gear oil. Recommended would be found in your manual. I'm guessing its a SM-465 which has the granny low with 3 more speeds. Most go with a 85W-90 with a GL-4 rating. Stay away from GL-5 it will eat your synchronizes.

Fuse would be the first check. It might be a relay I cant remember off the top of my head.

Id be willing to bet your losing power with only a straight pipe with no restrictions. They benefit from a little back pressure. Do you still have your Cats or any muffler?

We could go back to the 80's. My 1982 GMC K2500 (6.2 Diesel and TH-400) had 2.56 gears. It would cruise very nicely at 60-65. These new transmissions really make up for a low rear gear. 3 speeds vs 6,8 or even 10 is no comparison.

Haynes manuals are pretty handy. They can be ordered online or even are available at most parts stores.

https://www.rockauto.com/en/catalog/chevrolet,1993,blazer,5.7l+v8,1050714,suspension,control+arm,10401

I would say you posted this in the wrong sub forum.

Hows your fuel pressure?

Id start with your fuel pressure test. Might as well get all the info before you try and diagnose.

Musk has more money than probably everyone on this page put together. Id say he can do whatever he likes with his time. Hes done his work.

Its entertainment, for every guy that doesnt like it, 2 do.

It wont be fast. Other than that, should be fine as long as your tires are load rated.

Id say replace it now while youre doing all that other work. Use nice fluid if you plan on letting them go for 45 to 50k

Sounds like you got a bad battery if the cables are tight and making good connection. See what NAPA says. Any warranty on the battery? What brand was it?

They did. Solved the problem. Sounds like you got your problem fixed.