W201 Automatic Transmission Issue

[joshuajack]

I just picked up a 1990 190e 2.6L Automatic and have started restoring it (since it was sitting for the past 2 1/2 years). I am in the process of flushing all fluids, and with the transmission changing the seal and filter and *hopefully* using Royal Purple Auto Trans fluid.
I do have a question, however. It seems that it does not shift into 4th gear. Actually I have to shift into 3rd for the forward gears to engage. The shifter feels loose. Is it something that might correct itself with the fluid flush/change?
Thanks ahead of time.