Got a 3rd gen automatic, was just wondering if it's possible to replace the shifting knob itself. The fact that there is an overdrive switch complicates things. Any input??

 

No aftermarket replacement AFAIK, closest thing I've seen that might work is a Celica/Supra auto shifter with O/D button and it is not any nicer looking.

 

Rekindle old thread*
Just did a mod on mine when changing shifter bushings.
Cheap china Amazon aluminum automatic shifter, and a whole lot of Dremel work to make the receiver oval to work.
Relocated O/D button to side of console