| 摘要 |
A fluid pressure actuated auxiliary transmission section (14) shift control system (300)/method is provided which includes control members (246, 328) to prevent auxiliary section synchronized clutch (92, 128) damage if the main transmission section (12) is engaged during an auxiliary section shift. A differential area piston actuator (220) assembly is utilized to apply either a relative high (p*a224) or relatively low (p*(a224-a222)) force to urge the auxiliary section high-speed ratio clutch into engagement depending upon the sensed engaged or disengaged condition of the transmission main section.
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