Check out this Caterpillar Gearbox Model# 364-8420 Repair we did for our customer. This Caterpillar Gearbox Gas Generator Model# 364-8420 was repaired for our client within two weeks! This is the type of service you hundreds and hundreds of customers have come to know and trust from PPG-Works.com. We are the ultimate in Gearbox repair. Most of the time our customers think when the Gearbox Repair breaks they need to buy a new one.