![]() ![]() This is a unidirectional clutch problem, maybe mixed up with the relief valve dashpot playing up. On over-run the UDC transmits torque back into the OD unit. The outer clutch is the one that moves against a special cast iron brake ring, disengages the inner clutch and transmits drive via the sunwheel and planet gears. This inner clutch is engaged locked and held in place by 4 large springs and the helix angle of the planet gears. ![]() The inner clutch transmits drive when the OD is switched out and depends on the lockup of the UDC. The solenoid has a tiny spring inside which is known to weaken and prevent the valve from releasing pressure properly. ![]() Laycock made stacks of overdrive units with defective Unidirectional clutches, and the relief valve is known to stick or very occasionally break up. Most people have no idea an overdrive is always engaged whether it's in or out of overdrive. The problem is only from cold, in 3rd or 4th, at between 2000-2200 revs in either gear until the overdrive is engaged.This is a unidirectional clutch problem, maybe mixed up with the relief valve dashpot playing up.
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