I disagree that over the long term the two will work interchangeably. Toyota changed the design for a reason - why not reuse an available part if it "works fine".pasnkhunter said:4sp. top works fine with cap installed over the end. Bolts on the same and shifts smooth.
With the 5spd bushing shoved over the 4spd end the plastic is not supported laterally by metal, meaning that over time those two sides will be crushed and end up resulting in excessive slop.
The 4spd shifter end is a slot that directly actuates several "fingers" corresponding to the various gears. The 5spd shifter end is a "ball", with the bushing, that sites in a little cup attached to a shaft which when rotated, pushed or pulled actuates another mechanism deeper inside the tranny to select gears.
Yes, you can save $100 now by reusing the 4spd shifter, but at some point that bushing will wear out and you'll be pulling the tranny to fix the problem. Pay now or pay later...