Over the mini-truck years, Toyota used a few different versions of the gear driven transfer case, as well as the chain drive transfer case.
Start by learning how to figure out if you have a gear driven or chain driven t-case by reading this:
http://www.marlincrawler.com/htm/transfercase/gearvschain.htm
Now that you know the benefits of the gear driven transfer case, check out this link for a list of what years the forward and top shift configurations came in.
http://www.marlincrawler.com/htm/transfercase/app.htm
And continue on to find out specifics such as noisy bearings, quiet run gears, and other features on the specific model of transfer case.
http://www.marlincrawler.com/htm/transfercase/tcaseinfo.htm
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