ok i have 1994 dodge cummins with a auto tanny. acted fine when i first got it shifted and locked up fine. put a lock up switch on it and it acted fine for a a couple of days. then if i had the switch off the computer would not lock the converter up and niether if i would hit the switch. took the switch out and the thing started acting fine again until the other day i was driving down the road and the converter locked up then unlocked within seconds and would not lock up after the 1 time. turn the key off as the truck was rolling down the road and start it back up it did the same thing it would not stay locked up more then seconds. the next day it was fine and still is until this day.

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could this be a wiring pormblem some where the wired was fine for the lock up switch .????//

 

What kind of mods you have? helps to fill out your sig so we know what we are workin with

 

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i had a similar problem with my 96 auto. it had the torqloc switchin it. i never found out what was wrong with it but it would shift just fine with the torqloc on but when it was off it would not know where it wanted to be. it would shift in and out of OD like crazy just driving down the road. the guy i bought it from had the tranny flushed and the valve body cleaned out and he said it worked like new for a while.

 

Well mine was doing that but my tranny guy said to clean all your battery cables and check the senser that is in the line that goes to the cooler in the front of the truck mine will still start to screw up and i will wiggle the conection to the senser and it will start to work.

 

Clean the battery terminals and check all your grounds. If you have a bad ground it will cause problems with the lockup. I had this same issue just last week.

 

of course i start to talk about it and the damn thing started acting up on the way home to night. it was fine all day. then tonight it started it again did it once then i shut the truck off but still rolling down the road and started it back up locked up again 1 time hit the brake pedal then it wouldnt lockup unitil i shut it off . after the i pulled it to town and stop light to stop light it was fine. i think it wiring or a piece of dirt or metel in there



its a 94 cummins with 5 inch exhaust and 370 injectors and ground down fuel plate moved all the way up and k&n intake and and 4 k governor spring kit and pump will be advanced this week end

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what grounds are you talking about about like which ones did you have a promblem with

 

I had one loose battery terminal and they were both pretty dirty. Just check all your grounds. Also clean the plug for the tranny temp sensor. A bad connection there can also cause you to loose overdrive.