EC4WDA • East Coast 4 Wheel Drive Association
Forums:
Local:
EC4WDA • Northeast Region
NEOW • Northeast Online Wheelers
Friends of Coy Hill
National:
Pirate 4x4
Jeep Forum
NAXJA
Jeepin
Local Shops:
Full Tilt Fabrication • Westfield, MA
Mitchell's Differential • Shrewsbury, MA
Disclaimer: Not all links are affiliated with Underground Jeeps. They are things I have found helpful on the web.