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Old 05-28-2011, 08:30 PM   #2
awbrown
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Join Date: Aug 2009
Location: Detroit MI
Posts: 1,209
Re: 66 Suburban - Transmission Woes!

as you increase engine rpm and shift it manually does it shift ?? if so you lost your vacuum to the modulator or the modulator went bad.. they are also known for governor problems , both easy to try before giving up on it .. also make sure the detent cable isnt broke or stuck wot......
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