I swapped in a rebuilt trans and new Circle-D 3400 258mm converter this weekend. Test drove it and everything felt good except when it went to lockup you could see and hear the rpm's drop 2-300 but it was just like it was shifting to another gear and not fully locked. The rpm's would raise 3-500 with half throttle or so. The trans I pulled had a 2800 P.I. Vigilante 9.5" so the tune is good as far as being tuned for a converter.

The solenoids were tested by the builder and he said they tested good... I have no problem replacing the tcc and pwm solenoid but I don't wanna just throw parts at it either.

BTW, It did the same thing when I commanded lock up with efi live. It just seems to not be fully locked!

Suggestions?

 

Some reason the converter is slipping.. did you command it 100% duty cycle?

Ive had a couple stock converters do that but i just threw a new one in and problem solved.

Did you buy the Circle D from them or from another person?

 

In efilive I did command the tcc solenoid duty cycle to 100% and it barely made a change.

 

I smoked my current 60e because of the same crap... could be a worn valve in the valve body or the tcc solenoid.... who did the rebuild?

I certainly wouldn't drive it like that... mine hit over 250� before I could get it home.... fluid was black as coal after that.

 

You have the 258mm Stage II Single Disk. There is always the potential we screwed something up in the converter, but it is unlikely. And sadly there is no way to test the TCC pressure. Like mentioned above could be a worn bore or a bad solenoid. And like mentioned, it will burn the converter up so do not drive it. Keep us updated...

Chris

 

Do you have a stock converter you can put in there to try it?

 

I only tried lockup a few times, the rest of the time i was below 55 so it wasn't commanding lockup. I haven't drove it since till i get this squared away.

I do still have my P.I. converter

 

I bought it brand new from Chris @ Circle-D

 

I wonder if the oring on the input shaft is torn or was torn when you installed everything.

 

That was mentioned by the builder, I'll be messing with it again on friday so i'll look into that