Lots of guys have gone automotive from aviation...don't try to impress them with aviation jargon and stories about the specifics of what you've done. They don't know, they don't care. Tell them you've done engines, tires, body work. Tell them you can do fiberglass, fuel systems, electrical. You have your own tools...that's the biggest thing right there. If you've ever been called on to service ground equipment, include that as automotive experience
If you're looking for work outside the industry, then your two biggest selling points are how long you've been a mechanic, and weather you have your own tools.
Remember that your full box of quarter inch SAE won't get you very far in an automotive shop...3/8 or larger and metric, plenty of box end equipment, and nothing fancy. Automotive maintenance is like performing surgery with a jackhammer, but it pays better, is a lot more consistant, and like working in a mortuary, is the essence of job security. It's plentiful, you'll always have more work than you want.
If you're going from aircraft to automotive, you'll feel like you've been banished to soviet block cold war equipment in comparison to aircraft standard and quality, but shoot...a car isn't an airplane.
If you're going to go automotive, the best money is in diesel maintenance, large equipment. That's a whole different set of tooling and equipment not to mention experience...but you can get some training at the local community college if someone won't pick you up for OJT...and the pay is better.
There's a lot more to maintenance out there than the airlines...if you want to stay in aviation, the airlines are just a sliver of what's available. If you've mostly done only airlines, your overall experience may be quite limited (same if coming from an airforce background)...keep that in mind, don't describe too much of your past experience, and learn as you go. Lots of others have done it, too.