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Any info on replacing pinion gear seal on a 8 3/4 489 case ?

Have a 1969 Dart Swinger 340-4speed 11.1 compression hydraulic cam .510 lift 245/60/14 tires 3:55 gears. 2900 rpms at 60 mph mostly highway driving. Would there be much difference in rpms and gas mileage going to 3:23 gears at 60 mph? Any info would be appreciated thanks.

Have a 1973 Dart Swinger. What is the lowest gears you can get for the rear end? Looking to lower the rpms at highway speed.

Have a 1973 Dart Swinger 318,Auto. Thinking about putting an intake of a 340 on it. What do I have to do to make sure it is set up right for the transmission? I know the transmission is not as strong as what would be on a 340.