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The R380 gearbox in my 300 tdi DefenderDiscovery has recently started locking when I shift from 5th to 4th, to get 4th gear I have to nudge 3rd then it will drop into 4th no problem. Why?

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The R380 gearbox in my 300 tdi DefenderDiscovery has recently started locking when I shift from 5th to 4th, to get 4th gear I have to nudge 3rd then it will drop into 4th no problem. Why?

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A common fault on the early R380 gearboxes was the 4th gear baulk ring. The slot locating the synchro slipper wears and allows the baulk ring to rotate too far. This blocks the synchro assembly. It will be necessary to rebuild the gearbox, and replacing the baulk ring with a later type will eliminate this fault.

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