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Re: 427 tall deck in a 1979 K25 GMC
I totally missed the "K" part. Doh!!! You are right about the 5 speed. HOWEVER there may be an out for you. GM put SM465's in the big trucks with the 13" clutch. With that said, you may be able to simply swap the input shaft and be done. Or you may be able to swap output housing and output shaft onto the big truck 4 speed. That would do it for you.
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72 GMC C2500 402/Th400 first truck (still have)
77 GMC C3500 CC dually Sold 
70 C50 dump truck "Rusty"
87 K10 Suburban Sold
93 K2500 xcab 6.5TD
96 GMC K2500 Suburban 6.5 TD
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