How to I put a truck into 4WD?

I've been looking a purchasing a 2000 Ford F350, so far I've everything seems okay on the truck. I don't know how to switch the truck into 4WD so I can test that out, it has a switch on the hub caps that say "lock" and "free" and also a lever beside the gas pedal with indications on which setting is 4WD high and which is low range.

2000 f250 7.3l powerstroke engine coolant capacity and brand?

I just bought a 2000 Ford f250 super duty 6 speed 4x4. I desperately need to do a coolant flush because the precious owner filled the thing with kerosene. I don't know how long its been like that but i'm flushing it and buying all new hoses and a new coolant tank as well. I'm gonna hope for bow all the gaskets are ok. Anyway. I need to know what kind of coolant I should buy. I usually just go with prestone straight antifreeze and make my own 50/50 mixture. I hear it takes 8 gallons.

Is it necessary to replace the head studs on a 2004 Ford 6.0?

I'm looking at buying a 2004 F250 with the 6.0 diesel. The guys says that the heads are not studded. Is that a bad thing? Do you have to replace the head studs? And if you do, do you have to replace the head gasket as well, or could you just replace the bolts/studs.

I want a diesel ford f250 (7.3L turbo) please talk me out of it. Or is it reasonable?

I have no legit reason for needing a diesel truck. I just Really want one as opposed to the gas counterpart. The immense joy I would get out of starting that beast and driving it would be worth the extra cost of the maintenance to me. I've done EXTENSIVE research on both the 1999-2003 f250s and the 7.3 engine. I know a good deal about their issues but mostly about their awesome performance and longevity. The problem is, I live in central Illinois where we have bitterly cold winters. I have no place to plug it in. I wouldn't drive it every day. More like every other. I'm a college student. I work 2 part time jobs and pull probably enough cash to pay for it but please give me more info on why or why not it'd be a good or bad idea to buy one of these trucks just for the joy of it.

What to upgrade on my truck?

I have a nice 1996 Green Ford F-250 XLT with a 460 motor. What I'm wondering is what could I upgrade on the body or interior of the truck? I don't need to upgrade the engine it's perfectly good. But what could I upgrade about the truck such as the lights or grill in a somewhat cheap way?

How about a 2011 chevy 3500HD HO diesel dually?

Yea I'm looking to buy a Chevy 2011 3500HD HO with a Allison trans 6.6 duramax diesel 4 door and 4wd and we test drove it and lemme tell you it weighs over 9,000 pounds and still has more guts than a little f-350 super duty ford… And is a lot bigger than any other ford I've seen… What's your guys opinion?