Here's a few:
http://www.autotap.com/
http://www.autoxray.com/index.htm
http://buy.snapon.com/catalog/PRO.asp?Group%5FID=3098&Group%5Fname=Scanner+Kits&Cat%5FID=866867&Cat%5FNAME=Diagnostic&Sub%5FCat%5FID=866868&Sub%5FCat%5FNAME=Scanner%2C+Scanner+Kits+And+Diagnostic+Cartridges&store=snapon%2Dstore
Of course the snap-on is too expensive but I've seen them on ebay for around $500. It allows you to run solenoid tests and transmission tests.
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Dodge Ram 1500, 1997, Auto, 318, Swamper TSL 36x10.5x16, Rancho 3" Sport Lift, Hellcat Style 34 16x8, Superlift Speedometer Calibrator, Optima Red-Top Battery, 2m Radio, Black Toolbox.
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