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Discussion Starter #1 (Edited)
Need help E4OD not locking in 4th
Hello everyone i have a 91 f350 with e40d and the torque converter will usually lock and “feel like it’s hitting another gear”hitting 4th gear but the other day it wouldn’t lock up until i let off around 45-50 and then once it locked up it would slip out of lock up and now won’t even try and lock up anyone know what the problem could be. I’ve also kept a check on trans temp all today and it hasn’t gotten above 170* fluid don’t smell burnt either. If any ideas let me know, thanks
 

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Former Ford Trans Engr.
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My idea would be to read the codes. If it won't lock it should have set at least one code to tell why it won't lock.
 
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