76 300D Shifting at high RPMs

[Lifeinajug]

Howdy. I'm new here but have been lurking for awhile (in the best way possible). I'm thinking about buying a 76 300D that seems to be in really good shape. Around 120K miles. I would be travelling a ways to get this car and have been talking to the seller in detail. It seems to have two issues.

1) The power booster on the brakes is going out. He says brakes have full power when pressed quickly, but loose power if presses slowly. He's including a power booster with the deal.

2) The trans shifts hard and at high RPMs across the board. It will go into each gear, but it consistently shifts above shift points in all gears. Letting up on the accelerator encourages shifting.

So, if you wouldn't mind imparting your two cents I would appreciate it. My main concern is with the auto trans, but I have a feeling (or more like a hope) that it could just be a simple adjustment (cable?)

Anywho, thanks a bunch!
Travis