This is a factory M6 car that was converted to A4 with Speartech harness. Built trans with Yank converter.

At WOT car shifts fine from 1-2 but on the 2-3 shift it goes into 3rd, but only for a second then shifts right into OD and converter locks immediately.

Car just falls on it's face then.

Any ideas?

 

what happens when u hold it in d3? U may have to scan it to see if it's commanding 4th and lock-up....who did the tune?

 

Will HP tuners scan it? or have to have a dealer scan tool?

 

HPtuners is fine, look to see the shift solenoid come on....they are both off in 3rd. If a solenoid is on when u are supposed to be in 3rd u will get 4th, and the prob is in the tune (mph threshold too low for 4th at wot). Both sol. on is 1st, drop 1 and u get 2nd, drop that one and u get 3rd(both off), turn 1st back on u get 4th.

4l60e does not shift, it is TOLD to shift by adding/removing power from 2 shift solenoids, based on the pcm commands that are based on sensor input and tune parameters.

The trans can shift or not if commanded, but CAN NOT shift without command from pcm.

 

Exactly what JUNK says.
I also suspect the tune is way off or the A4 segment was not loaded correctly into the PCM.

 

this is how the 4l60e always drives.

you need to invest in a 7 speed transmission, will eliminate all your problems.