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,,
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Re: 1991 Ford Thunder Transmission Not Shifting When Cold
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.
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1. Disconnect the negative battery cable
2. V-8 or V-6 are both located on the passenger side, remove two or three bolts holding the starter on the transmission
3. Drop the starter through the opening between the firewall and the exhaust
4. Unbolt the battery cable from the starter, and disconnect any other wires.