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A new heavy duty/performance "scissor" detent cam spring for the M20, M21 & M22 Muncie '63-'74 4spd. (also fits the saginaw's) GM used a much smaller/weaker spring for passenger models and a heavy duty spring on the performance models.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.