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Message: <blockquote data-quote="jiraiye" data-source="post: 478520" data-attributes="member: 21841">actually what do you mean ran underpower? is your gearbox warning light constantly after you start the car? if yes then you are in "limp mode", gearbox always in gear 3 (if i am not wrong). If diagnostic say solenoid valve, then change out try try first. Even if wrong, at least you know u have got a new solenoid valve in your gearbox should u choose to overhaul the gearbox <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> If i am not wrong, 1 valve around 2-300 rm for GM 4spd gearbox (my previous gearbox)...</blockquote>