Can anyone ID this shifter?

Aftermarket Hurst generic type shifter handle. Not worth nearly what a 68-76 factory shifter handle is worth ($75-$125) or an F-body one.

Be sure to open the side case and look at the gear engaging teeth. The gear teeth rarely wear. More likely to pit from laying around and getting water damage. Look to see if the engaging teeth have sharp points. The engaging teeth are part of the gear. So to fix you need a new gear (expensive) or reface die grind very carefully each engaging tooth (time comsuming, slightly trickey).

Bring a flashlight, brake clean, and some rags, tools to get side cover off (1/2" and 9/16" socket, screwdriver to get forks loose). You'll probably have to brake clean the engaging teeth to get the oil off them to look at them.

read here on engaging teeth: http://www.forabodiesonly.com/mopar/showthread.php?t=309218&highlight=engaging+teeth