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Axle guide from OffRoaders.com - Contains a list almost every 4x4 vehicle available in North America and what axles were available.
Axle identification guide from OffRoaders.com - Contains a list of different axles complete with a sketch and general description.
www.4wd.com - 4 Wheel Drive Hardware-Jeep Parts and Accessories.
http://www.nebraskatire.com/index.html - Great place for Name brand cheap tires. Shipping is cheap and fast.
http://www.shakerbuilt.com/ - For custom stuff. Tim is a great guy.
http://www.rockymountainsusp.com/ - I bought my suspension from these guys and the girls there know their stuff.
4 wheel customs - Chris at 4 wheel customs is a good guy. He is definatley A-1 in my book.
4 Wheel Parts - The Leader in Off-Road Adventure.
DC 4WD gears and lockers - DC4wd has the best prices on ring and pinions, lockers and install kits that I have found anywhere. I forgot who I talked to but they have great service.
National Tire & Wheel - National Tire and Wheel carries a full line of 4x4 Tires, Custom Wheels, Suspension Lift Kits, Winches and more.
Swiss mountain 4X4 - Swiss mountain 4x4 is a good place for jeep stuff.