I got my 71 Challenger convertible up on the lift,and pulled out the driveshaft. I have been experiencing a driveline vibration that has been get worse lately. The U joints seem good, the rear end has very little play,no leaks around the pinion seal,it was low on gear oil,but not empty by any means. The rear axle is a 489 case 8 3/4 sure grip with 3.23 gears. The driveshaft is the one that was in the car when I bought it. The yoke going into the transmission is not pretty and could be the cause of the problem. I also have a transmission fluid leak when the car is parked. It leaks a considerable amount of fluid, maybe half a quart or so everytime I park the car. I am not seeing any obvious spot where the leak is coming from. The pan bolts snuggled up with just a quarter turn each. I checked the lines,dipstick tube and speedometer gear housing, all were dry. I pulled the front dust shield and it was dry where the front seal is. I think that I am going to have to top the transmission fluid level off,run the car up to temperature, run it through the gears and park it with cardboard under it to pinpoint the area of the leak. I would love to get it sorted out and drive it for the fall. The turning foliage is amazing to view in a Mopar convertible!
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