Royce
January 18, 2021, 3:29am
21
The two holes began in late February 1968 to allow for the repositioned vent hose due to the new staggered shock setups used with manual transmission 428CJ Cougars.
I thought the two holes started in '70, with the '69’s having just one hole and using a bolt with a vent to serve double duty as the axle vent and hold down for the brake line block.
Chopaka, you can try looking for a 2-digit hand stamped date code on the front of the passenger side of the housing, located just to the inside of where the axle flares out. Unfortunately, it won’t tell you a year but it will give you a month and week of that month. That might help you narrow down what car it could go with.
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