Thanks to everyone for all the good information. I have read many of the Trans-X threads. The transmission fluid, though seemingly okay, is indeed overdue for a change. I'll probably try that first before Trans-X. Would using Mobile 1 synthetic be advisable or is regular Dextron III the way to go?

I'm not sure if the slipping is occurring at the 2-3 shift or after since it has occurred so few times, I'm moving so slowly, and I'm not paying attention until I notice the loss of power and the engine reving.

I like Jim H's list of possiblities and hope that new fluid and filter will cure this. None the less, I am concerned about the 1 1/2 second delay in engaging reverse. Does this along with my slipping symptoms portend imminent failure of the transmission?

It's strange that it is so intermittent, but it definitely has only occurred with the engine completely cold after sitting overnight.

__________________
Rob
'84 300SD 258K
'85 300D (sold)