Pro1, that's where I mounted mine, too. I also have a Ranger. Mine's a 2006, but anytime from 1993-on, the interior's pretty much the same.
I took three or four long, black zip-ties and put them together so they were long enough to get all the way around my radio and the ashtray tracks. Basically, I tied my radio to the cradle where the ashtray used to sit. It helps that my radio (Radio Shack trc-484) is pretty small, since I have a stick shift down there too. I had to use an "L" connector to get my coax onto the back of the radio because the heater ducts located between the heater controls and your transmission "hump" made for a tight space behind the radio.
If your Ranger is an automatic transmission, you'll have an easier time getting your radio mounted down low-- and you probably will be able to mount a larger unit. My five-speed shifter makes it tighter and partially obstructs my radio knobs, so that's why I have to run a radio with a small chassis. I have channel up/down buttons on my mic, which allow me to surf the channels a little bit without bending down and taking my eyes off the road while I fumble around trying to get to the channel knob. That's a big help.
I've been looking at some of the newer Radio Shack and Uniden units, which are getting to the point that they're about half the size of even my small trc-484! I think Radio Shack (Realistic) radios get a bad rap for very little reason. In a four-wheeler install, they're probably all you'll ever need. Plus, snce they've got a much lower value and usually aren't chromed, some meth-addicted driver is less likely to steal it from your ride the next time you're on a road trip and stop at the TA for gas and some eats. I'm about to see how my old '80s Radio Shack will handle a 200 watt linear (see my thread here) if'n I ever get my hands on an SWR/watt meter I can trust...stay tuned...
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