Hi, my trans will not shift under WOT. 1987 Buick Grand National 200r4 I changed the filter and fluid and tried to adjust the tv cable. I do not believe the cable will adjust correctly. I push in the tab and pull the sheath all the way back towards the firewall. Then I do three WOT with the accelerator pedal and only about (maybe) 1/8th in. comes out. I can't even see the teeth. With this setting, the trans would not shift up unless I was almost completely off the throttle. So I played around with the cable. I pulled it off the throttle blade and pulled on the cable by hand. It moves but seems tight. I am not sure how it should feel because I don't work on older transmissions. Anyway, I was able to push in the tab and force the sheath back forward towards the cooling fans and it looks to be out about where it was originally. Now it shifts better under moderate acceleration(even 3/4 throttle) but still not WOT. I am thinking I am compensating for something else by adjusting the cable. I understand the governor valve and tv valve are fighting against each other to allow shifting. TV for kickdown, governor for upshift. My understanding is the when the governor valve exhausts it allows an upshift. It exhausts when the valve overcomes the spring pressure. Thus if the spring was worn, it should shift too soon but it does the opposite. I guess I have to pull the pan off once again but I don't know what I am looking at(aside from the normal, valve body, ports etc. I am just not sure which one is the governor valve or tv valve). I can't find any good diagrams online (so far) of how everything should look. I figure since the TV cable seems tight ( I can still move it) that maybe something is jammed but maybe that is how it should be? Even so, I thought a binding TV cable causes an upshift only under WOT. So to recap, the trans does not shift under WOT unless I left off and back in it. I can't get the TV cable to adjust properly either (at least I think so). The very first time I adjusted the TV cable, there was slack in the cable. Now there is no slack but it does not seem to come out far enough and it causes the trans not to shift unless I am almost completely off the throttle. Thanks for the help.
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