Dunno. You rich guys that can afford to put gasoline into these things
seldome DIY tranny repairs :-)

I *think* the K1 spring is weak in your tranny and you can replace it
in situ with e new and stronger one and assuming yoru clutch packs aren't
work this may fix it. But you'd probably want to talk to somebody who
knows this stuff better than I do before taking the time to rip into
yor tranny. The spwing itself is cheap and you can get them off ebay.

http://articles.mbz.org/transmission/k1/

Oh, crap, no, that's 2/3 flare. Sorry.

(regroups throghts). Ok the B2 piston controls 1-2 the B1 piston controls
3-3 (which is why you can actuall drive a car with a broken B2 piston once
you get it moving). This is controlled by the madulator valve and there was
an upgraded part. Now I'ce changed the B2 piston on my car but coulcn't really
tell you where the B1 piston is and can't see it failing to work "a little off"
that is if it fails, you have real problems.

I assume you've tried changing the fluid and filter?

If it were me I'd seek out somebody that knows these trannies. It might be
a simple fix. SOrry I can't be of more help my expertise is quite limited.