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@gbj_tester
SRAM Tech manual for GXP:
"Check the assembly for play by rocking the crank arms back and forth away from frame. If the crank moves, tighten crank arm bolt until no play is detected. If maximum torque of
54 N·m (478 in-lb) has been achieved, remove the crank arm from the spindle, apply additional grease and repeat installation procedures until play is eliminated."
The GXP system is unusual compared with other external BBs in relying entirely on accurate assembly tolerance to eliminate play without excessive bearing preload. If everything is correctly made (mostly BB shell width), it should just pretty much fall together, but if it doesn't, there is no wave washer (UltraTorque) or preload screw (HTII) to take up the slack.