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I have a 5.12 rear end with a Giken LSD in it set up with a pin for either a sliding block or a watts link that is gathering dust in my garage.
I race in the midwest and this seems to be the best gearing with a close- ratio for anything smaller than a full race 1750.
IMO, your handleling in the rear needs to start with getting rid of the T bar and moving towards a Panhard, watts, or sliding block. In many cases you will not need a rear swaybar, especially if you are running Bias Ply tires.
Once you have it settled you will find your 4.56 gearing does not work with a 1600. I would look for a 5.12 and consider some of the higher (5.43 I think) ratios depending on how long your tracks are. I don't think you should be able to throttle steer a properly set up suspension with a 1600 on dry pavement with race compound tires and sorted suspension.
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