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I'm taking the pig unit off of the 8 3/4 rear end thats in my 340 Dart.... I'm looking for a new set of gears with a posi unit.... what gear ratio should I go with? 3.55? 3.23? 3.91? any others? I'm just looking for opinions and some feedback. My car is a stock 69 Dart 340 3-speed with...

I have a 69 dart swinger with the 727 transmission. I'm getting a grinding sound and slipping out of the tranny in first gear. It only happens off the start when I accelerate harder. A gentle acceleration shows no problems and all other shifts are fine. Do I need some kind of adjustment?