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I am new to this forum. I have recently purchased a 1971 K20 pickup. One of the previous owners put a 454 with a TH350 trannie in it. I will probably keep the 454 but would like to convert the truck to a manual transmission. Anybody know what 4 speed transmission they originally came with? I have ordered some reference manuals but they have been slow to arrive. Thanks, Jack
 

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Welcome to the forum Jack glad to have you here, sign0016 The K series truck not sure if they used the Sm420 or the Sm465 transmission. Maybe Charlie will know once he checks in. Did a quick check it was the SM 465 used from `68 to `91.
 
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