Quick history.
The first B4 (I think was referenced to as the stealth, the transmission was called the stealth. Change from the 6-gear to the 3-gear.)
This B4 came with the smooth shock bodies.
The next was the Factory team. This came with the threaded shock and ti buckles. (And some FT upgrades.)
After that the B4.1 RTR & FT were released, with minor updates to the platform.
Any B4 can be updated to a C4.1 as long as you have the B4.1 ball diff with the metric bearings.
MiCk B. :-)
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