I just bought a 91 Z w/350 and 700/r4. It was shifting perfectly when I got it, going into overdrive at about 42 mph or so. Then, I had the throttle cables disconnected and plenum off to replace a bad egr valve. When I put everything back together I forgot to adjust the TV cable and noticed the difference in shift points immediately. I wasn't able to get overdrive until about 53 mph. So, I adjusted the TV cable according to the Haynes repair manual, but guess what? Now it shifts even worse! I can't get into overdrive until about 63 mph! And all my other shifts are way higher than they ought to be. I want to get the shifts back to factory specs--hitting overdrive at about 42 mph. Anyone out there have the solution?

 

Just keep trying to adjust the TV cable.That sounds like the problem.

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[This message has been edited by Kevin S (edited December 04, 2000).]

 

Kevin's right... actually you might have it set correctly. The trans could be half-shot after years of driving with an incorrectly set TV cable.

My friend has an '86 Monte, and the trans was acting up. For kicks, I reset his TV cable as per the book. We went for a ride, and his car shifted much worse (later shifts, clunking into gear, etc). I immediately put it back to where it was.

I usually make a mark of where the TV cable goes into the slider with white-out. Then I re-adjust the TV cable as per instructions... when I'm done, I can see how far the original setting was off spec.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
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So, can an incorrectly set TV cable actually cause harm to the tranny over time? HOW SO?

 

Oh, definately. The TV (Throttle Valve) cable isn't specifically a kickdown cable. It controls line pressure (fluid pressure) inside the transmission. The line pressure is what determines how the tranny shifts. Less line pressure = TV cable adjusted too far towards front of car = earlier+softer shift. More line pressure = TV set back towards firewall = later+harder shift). If the TV cable slips to give the trans too little fluid pressure, the trans can burn up.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!