I have a 97 F350 5.8 with E40D trans. I bought the truck with it shifting hard thinking maybe a simple filter/fluid change would fix it. It may have helped a little but did not fix the issue. There were 3 or 4 codes that I have already cleared up with new parts. I am still getting a 327 (something with EGR?) and 629 (Converter clutch control circuit failure). These show up in KOEO and KOER self test. The O/D does not flash ( bulb does work).

Parts that have been replaced: VSS, MLPS, new connector going into solenoid pack (tabs were broken), TPS. Removed the trans wiring harness and there is no damage or loose connections. When I replaced the solenoid connector I noticed there was some trans fluid in the connection. I cleaned it the best I could and reinstalled with dielectric grease.

The truck runs fine and shifts in and out of every gear fine its just shifting hard. If I unhooked the battery it will shift perfect for 5-10 minutes but then the hard shifting returns.

The only other thing I can find with my research is maybe the solenoid pack needs replaced.

I figured if I take it somewhere they are going to want to rebuild/replace transmission. It seems like it can't be something very major since it will shift fine when reset.

Anyone have any ideas?

Thanks, Daniel

 

Sorry. I put this in the wrong thread if someone wants to move it.

 

Code 629 means there is an electrical problem with the converter lockup solenoid circuit. It could be a broken wire between the PCM and the solenoid, or it's a bad solenoid. A few minutes with a meter can tell you where the problem lies.

 

I checked the wiring harness at pcm to connector at solenoid and there is a good signal for each wire. I guess I will try a new solenoid. Anything I should look for? Once I drop the pan can I see the bolts holding it on? Thanks

 

Dear All

This is Very important; I started feeling issues with the transmission, when it's shifting between gears It lunges, jolts, doesn't engage and sometimes the transmission slams into gear so hard that it feels like I just got rear ended with a big bang

please help me , i had a technician computer test the car & according to him , i should replace the transmission all together , he gave me this page once the test has finished ..
This is very expensive thing if it's true

please check the below image
View image: Diag