I have a '37 chev with a 61 261 eng/37 tranny combo. I know there is an oil leak past the driveshaft seal and religiously check and refill thru the fill hole until it starts dripping out. This time after topping off I developed a sizeable oil leak thru the 1/4" dia hole located on the underside of the snout of the transmission bearing retainer. Never happened before. Anyone have any ideas as to why? Want to parade the car over the holidays but don't want to wreck anything.