Question about 1991 Ford Thunderbird
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Posted on Jan 02, 2017
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
i found with mine there was a bar that ran up to the carborator from the linkage that was not secured properly once i hooked it up my trans shifted better but i lost some performance so the bar is a governer of sorts.
Posted on Feb 17, 2009
I have that exact same truck and transmission and My Transmission did the exact same thing about a year ago and there was some kind of snap ring inside the transmission that broke. I originally thought it had to be an electirical problem because the truck shifted fine until OD or if i turned OD off. The 4r70w is a light transmission and i would suggest you have a shift kit put in and they make a heavier kit to beef it up.. Sorry its probably not the new you were looking for.
Posted on Apr 15, 2009
yes itcan or it may just be the solenoid for that overdrive. make sure fluid is maintained and no mounts are broken
Posted on Apr 24, 2009
SOURCE: i have a 1991 ford
these are two separate issues, the 1st the tach is most likely the tach is defective, this is fairly common, the 2nd problem requires that u have the transmission control module tested for fault codes, anytime the OD light flashes it means the transmission control module has detected a problem in the transmission operation, this can be a shift error or More commonly excessive slipping has been detected, u may not even fell this but never the less the difference between the input and out shaft speed sensors of the transmission showed a speed difference that triggered the OD light and a fault code, not saying this is the problem but based on my experience of 35 years at a Ford dealer it is the most common fault, if that is the problem then the transmission will require a rebuild. THERE ARE MANY PROBLEMS WITH THIS EARLY E4OD, LATER VERSIONS HAS BBEN GREATLY IMPROVED.
Posted on May 30, 2010
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