RC10Talk - The Net's Largest Vintage R/C Community

check the 25yr thread for lots of details of difference between b2 and b3. A BUTTLOAD of info so be prepared https://www.rc10talk.com/viewtopic.php?f=35&t=13059 shorter answer: front and rear arms, c hubs, spindles, rear hubs, slipper, front and rear shock towers,trans plate, top plate, rear arm...

I pulled these from another thread a ways back, scans from RCCA.

Great build. Tons of great additions and modern mods that all look right at home.