The shift gate spacing from 4L60E's(and 65, 70) is different than the '80Es and '85E. It's just enough to throw off smooth function. This is especially true of the gap between park and reverse. It's wider on the 80E/85E. When using a more common '60E shifter on a car with an '80, it is possible to have a friend in the car move through the positions while you adjust the cable underneath for best compromise. That usually means engaging park but not 1st.
It's not impossible to use a shifter that is marked for use with a 700-R4, or 4L60E on a car with an 80E, but it is advisable to choose one with the correct 80E gate spacing. Lokar seems to have the best aftermarket selection of 4L80E specific shifters.
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Steve Chryssos
Ridetech.com
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