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This may not help,but I have noticed cars with spools in them or harder to push.



Around a corner yes , in a straight line no.

Also to the op , the sprag in the trans is also part of the problem , it's easy to turn the driveshaft in one direction , the sprag is slack , the other way the sprag tightens up and it spins the geartrain in the trans . I don't remember which direction is easier than the other. Jack up the rear and grab a tire, turn one way then the other , it'll be easy one way and not in the other.