Quote:
Originally Posted by Toothbrush
I'm no expert, but my ZF 6HP28x was doing something similar a few years ago as shifting from 2nd to 1st and into reverse was starting to get less than ideal. Shifting into reverse it would jerk slightly and from 2nd to 1st it was like my brakes were grabbing too hard, at least that's the best way I can describe it based on memory.
Replaced the mechatronic sleeve, seals, solenoids, new pan and that solved my issues.
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Yep. Sounds like it's time for a trans service if it's never been done before. "Lifetime fluid" my @$$. Thanks BMW.
You could try starting cheap with a mechatronic sleeve, tube seals, pan/filter, and new fluid (I like Valvoline Maxlife Syth multi vehicle as it's thicker than ZF and others). Reset adaptations. I've done this on 3 ZF trans so far with excellent results.
If that doesn't work you'd need the valve body serviced as well.