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I changed from a 3 speed to a 4 speed using the same 221 and didn't have to change anything or move the crossmember. The length difference is kept the same by changing the adapter length. Not sure why you had a difference. Did you stay with the 221 or was the 3 speed hooked to something else?
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1970 Blazer with a 400 sbc and 4" lift
1980 Pontiac Trans Am, 455 Oldsmobile
2012 Kawasaki Concours 14
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