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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
23,851 Posts
Really beat fluid can cause hard t/case shifting. Drain and refill should be about 2 quarts of ATF+4 (use the good stuff). Watch what comes out of the drain plug to gauge t/case internal health (this may not be the whole story, but an indicator). Linkage can also bind if it hasn't been used recently.
Different tire pressures and treadwear amounts can cause the forward drivetrain binding that traveling a few feet in reverse might unbind.
The growl is likely a failing bearing somewhere in the drivetrain or a sawtooth (cupped) tire. Maybe not the t/case. Try to locate the noise source first.
These were heavy, thirsty bricks.
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