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Old 09-19-2004, 12:36   #1 (permalink)
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Hard Shift Auto Trans

I have a 94 Bronco (now) with a 351 and an auto trans. Just turned 41k miles and out of no where the trans started shifting hard. Replaced the trans filter today and filled it back up... still shifts hard. When checking the fluid it looks like it is in the correct markings. Any thoughts would be appreciated.
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Old 09-24-2004, 15:08   #2 (permalink)
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Re: Hard Shift Auto Trans

Update to my hard shifting. Was told by a friend that supposedly that trans requires Ford Motorcraft tranny fluid. Don't know if it's true or what. Anyways, I unplugged the battery for a bit to reset the computer (yeah love those computer controlled components... NOT) Anyways, it fixed the problem. Transmission had been shifting as smooth as ever. Then 4 days later, driving home from work.. Stop to fill up the tank, and when I start going again it's now shifting hard. So is it possible I have a computer problem? or would you think it's a tranny problem?
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Old 10-25-2004, 10:30   #3 (permalink)
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Re: Hard Shift Auto Trans

Sounds like a 'puter problem.

Im a paramedic. When we deal with a patient, we assess to figure out the complaint. Then provide an intervention (drugs/treatment) then reassess to see if our treatment worked. You can approach a vehicle the same way. Corny analogy but it works.
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Old 01-07-2005, 21:12   #4 (permalink)
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Re: Hard Shift Auto Trans

Just to sort of update a few months later. Have since taken the Bronco to a Ford Dealer (At a time when trans was shifting hard). They hooked it up to the computer and told me for 3grand they can toss in a new trans, or for 1800 they can replace the torque converter. They say the problem is excessive slippage in the converter. Well, yeah there probably is when it's shifting hard. This is one of those annoying problems. I suppose when it gets warm out again, I'll probably try to replace the torque converter myself and hope that fixes the problem.
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Old 09-29-2005, 17:06   #5 (permalink)
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Re: Hard Shift Auto Trans

Once again updating my current problem. Hard Shift is still there but think I may have found something. Seems while researching on the net I came across a few pages talking about the E4OD and diesel engines. Seems that there have been many issues with the transmission controller. More often than not it returned the code for Torque Converter Slippage (My problem). So this weekend I will hopefully swap the controller from my 93 to my 94.
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Old 12-15-2005, 13:07   #6 (permalink)
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Smile Re: Hard Shift Auto Trans

i posted on another column but my 93 with the 351 has the same problem. the trans code is E so i assume it is the e40d trans even though some charts dont show that until the 94 bronco. mine shifts hard some of the time out of first but is smooth the rest of the time. electronics?? thanks for any suggestions
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Old 01-04-2006, 06:55   #7 (permalink)
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Re: Hard Shift Auto Trans

does anyone know if it is vaccuum or pressure that tells the trans to shift? also i have a Nissan 05 Titan Crew Cab pickup with 7000 miles for $21k. must sell asap 901.213.9635
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Old 01-05-2006, 23:07   #8 (permalink)
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Re: Hard Shift Auto Trans

Check your vacume lines......if you have a broken vacume line it could cause hard shifting........otherwise u may need a tranny flush or a new tranny
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Old 01-16-2006, 15:43   #9 (permalink)
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Re: Hard Shift Auto Trans

Did you check for DTC's?
If not, take it AutoZone or a local auto parts store that will check codes for free.
Then post here with code numbers.
..
a possibility; look here:
http://www.jasperengines.com/pdf/e4od-4r70w2_tb.pdf
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