Question about 1986 Ford Thunderbird

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1991 Ford Thunder Transmission Not Shifting When Cold

I have a 1991 Ford Thunderbird 5.0 V8 that has a Transmission Problem,For some reason the Transmission does not shift into 2nd or 3rd Gear when it is cold but If I let the car warm up for about 20 minutes it shifts into all gears with no problems,,

Any Help Will Be Appreciated

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Change the fluid and filter. Take note of the condition of the old oil and filter ie. does it smell burnt? Are there any metal filings/fragments? Use only mercon ATF, no additives. If this doesn't fix it, it will need a pressure/road test. Only other thing is the vacuum modulator valve. To check it, look on the pass side of the trans towards the rear for a small vacuum actuator. You'll recognize it because it has a vacuum hose going to it and it has one bolt holding it on. Remove it with an oil drain pan handy. There is a small push rod in the hole, be careful not to lose it. Now if you somewhat clean it, you can put a short piece of vacuum hose on it, and **** on it to see if it holds vacuum. There is a spring loaded diaphram inside that you should be able to move if you **** hard enough. If it's nfg, then air will be able to flow throuh the diaphram and it won't work. Hope this helps.

Posted on Feb 08, 2009


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