Check either the kickdown switch or the bowden cable. There should be some slack in the bowden cable. It's a cable coming from the tranny to the top of the valve cover. It gets pulled when the throttle is pressed. If it is too tight, the shift points will be REAL high and you may think that the tranny doen't shift at all.

I didn't think mine was shifting... until I got it up to 3500 rpm, then it did.

__________________
Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)