I am working on my sons 1997 ranger with a 2.3 and the harmonic balancer has slipped on the crankshaft. My question is, do you have to pull the gear off of the crankshaft to replace the key that keeps the gear and harmonic balancer from turning? I have to replace the harmonic balancer and key and need to know how to get the gear off if it has to come off to replace the key.