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It would be rare for this sensor to leak,although it is easily removed,the only seal is an o-ring.The likely source would be the breather located at the top rear of the trans main case.It could be cause by the absence of a vent hole in the dipstick.Some Allisons will leak at start up in cold conditions.This is an easy fix,just drill a small hole about 1 1/2 inch from the top of the dipstick tube. |