Allison 6sp: Torque converter problem without codes?

[Mike L.]

I just ordered a MikeL trans for my beast. She finally bit it. We think the torque converter is in full lockup since if I start the truck, as soon as the high-idle kicks in, it bogs down against the brakes and dies, If I put it in neutral, high idle works. Looking forward to my new trans. & AirDogII install.

Thanks Mike! :thumb:

I'll be shipping today or tomorrow Rob.

 

[oscyjack]

I get a similar vibration but am still pretty sure mine is driveline or a combination of driveline/trans/TC. Figure it needs a build no matter what so i'm done trying to isolate whats wrong and just going to see Evan. Tough part is arranging a schedule to be away for 2 days, and then matching my sched to his

 

[LML6600DMAX]

Did you find out what was causing the vibrations? I'm having a similar issue minus the black smoke.

 

[firefighter08]

Usually if the cooverter clutch gets to the point where it chatters it will throw a P0741 code. Easy way to find out is to put a scanner on it and watch the TCC rpm slip while the vibration is occuring. Anything over 30-50 rpm slip is not acceptable.

Old thread resurrected. So my 300-400 rpm during chatter is no bueno!