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Real OEM shows the same AT for the 08 335i as the 08 135i, GA6HP19Z and a quick check of the plate confirmed that.
I've had both a 08 335 at and now a 08 135i at and can say they both function the same.
What I've learned is that the AT is far too complex to be able to write it off after just one experience. There are a number of factors that can effect performance.
First, the AT has an adaptation feature that causes it to adjust it's shift points in relation to your driving. It helps to reset it prior to going from daily driving to track use.
The AT needs it's fluid's refreshed every 50K mi. Old fluid makes the shifts slow and clunky, fresh fluid makes a huge difference.
And finally, Alpina has a fantastic AT flash which really transforms the AT.
On the down side, the AT also contributes to high oil and water temps so added cooling is a must.
Set up properly I think it actually drives very well on the track. It's very controllable in manual mode and has flawless gear change.
All in all, the AT is a fantastic piece of equipment considering it's dual purpose.
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