I think your on the right path. Sit the tranny cv's on a spacer like you are doing and rock the tranny down in front,,,,,equals up in back. Lower the front as much as you can before you lose the mounts,,,alter the front mounts as much as you can before you lose the ability to mount the front. Your spacer might be a little thin ,,,,not sure,,just make sure there is clearance at full travel., This method worked for me,,,good luck

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If your clutch ain't slippin,, you probably got it adjusted right!!!!!