Routine maintenance. Something often ignored by most people. Don't avoid it by saying "Its a Chevy, it can handle a few hundred more miles before an oil change."

Rust prevention is another big one with these old vehicles. Every time you take it off road, powerwash the entire undercarriage, especially the insides of the wheel wells.

Just like anything, take care of your equipment and it will take care of you.

I started up a log book for my vehicle. I use one of the green log books like the military has. I wrote the make, model, VIN, etc. on the cover and keep it in the glove box. Every time any service is performed, I write down the date, mileage, what was done, where at, their contact info, how much the service and parts were, and any other comments. I even write down when the next inspection an registration renewal are due. My log book allows me to see exactly when a certain service was performed and I can then determine when and what next is needed.

Its never too late to start a log book.