mine was doing the same thing it would rev up around 3000 then SLAM into gear, Looked underneath and the modulator wasn't hooked up! Mod valve on a th350 is on the pass side with the hose coming off it to your intake
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2011 CCSB GMC 2500HD DMAX
73 GMC 3/4 ton 4x4
96 Chevy 1500 STD Cab Shortbed Z71
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