E4OD doesn't shift out of OD over 50MPH

[lsaami]

hello all,

I'm currently trying to figure out an issue with the E4OD in the motorhome. It shifts fine, for the most part, but it has a significant issue with downshifting, or rather, it doesn't. I'm at 50MPH or above, it won't downshift even if I floor it. I can get the torque converter to unlock for a moment by letting off the throttle completely and stomping on it as hard and fast as I possibly can, but that only lasts for a second before it locks again. under 50, it behaves normally.

New-ish torque converter and main seal (less that 5000 miles).
Banks trans command
Known good FIPL outputting correct voltage
speedometer works.


Anyone have any bright ideas?

 

[Thewespaul]

Are you getting wide open throttle with the pedal floored?

 

[lsaami]

Are you getting wide open throttle with the pedal floored?

I think so, I guess I didn’t consider that.

 

[lsaami]

Are you getting wide open throttle with the pedal floored?

Yes. I verified today with the wife, pedal all the way down holds the throttle wide open, and generates 4.09v at the FIPL.

 

[lotzagoodstuff]

Have you tried bypassing the Banks Transcommand?

 

[lsaami]

Have you tried bypassing the Banks Transcommand?

I did last season, but to no avail.

 

[Thewespaul]

What rpm are you at with converter locked at 50?

 

[lsaami]

What rpm are you at with converter locked at 50?

Not entirely sure. I don’t have an RPM gauge.

it’s a stock dully with 4:10s.