Now available are bolt-in drive shaft spacers for most Toyota pickups and 4Runners in thicknesses from 3/4" up to 1-1/2". Helpful in cases where your drive shaft (front or rear) is just a little too short and you don't want to pay several hundred bucks to have it lengthened:

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More info:
http://www.4crawler.com/4x4/ForSale/DriveshaftSpacer.shtml