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TH400 problem. please help
i have an 89 gmc one ton 4x4 with a th400. and when the truck is cold it shifts just like normal. but when it gets up to about running temp it will not stay in 3rd gear unless i shift it manually at about 50 mph and then keep it above 60.. i changed the vaccum modulator and still no luck. any...- Cody_454
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kennythewelderOfficially Retired, B31-3 (6-G) certified welder.
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