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Re: SM420 help!
It is common to use a roll pin to replace worn shifter guide lugs on the top of the trans. My guess someone dropped one down through the shifter opening. Other than that, there are roll pins that retain the 3-4 and 1-2 shifter yokes to the shifter shafts on the top loader.
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1953 3100 261cu in, sm420, 3.55 torque tube, omaha orange
1964 GMC 1000 series,custom, 305E, sm420
Last edited by sstock; 04-02-2022 at 07:00 PM.
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