Rick, if your odd shifting happened after bottoming out, check the gearshift rod support below the left header. It is threaded in a welded bracket and sometimes a sharp blow can cause it to move or loosen in it's hole. If it does, hard shifting can result. There's not a lot of clearance between the rod and a cut-away portion of the aluminum left motor mount; rotted rubber motor-mount isolaters on either/both sides can also cause this by allowing the entire engine to shift around slightly. The steel-on-steel sliding rod support could also use some lube, too; a high-temp lube is best due to the heat coming off the headers.
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