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Re: 87 GMC issues
Ski-me, oh ok, I resolved the shifting issue, it was a disconnected vacuum line from the vacuum modular, near the transmission, thanks to foampirate.
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1972 GMC Sierra C2500, V8-350
1986 GMC Sierra C2500, V8-454
1986 GMC Sierra C2500, V8-LS1
1986 GMC Sierra K2500, V8-350
1987 GMC Sierra R3500, V8-454
1997 GMC Sierra K2500, V8-454
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