What are reduction boxes?
Reduction boxes came on all busses through 1967. The effectively lower the gear ratio of the final drive, giving you more oomph at the cost of lower top speed and higher engine RPM’s. You can eliminate them by converting the bus to IRS. However, when you buy the kit to convert to IRS, they want your reduction boxes as cores. For a reason. Some day, you, or the next owner, is going to want to put the reduction boxes back in. And where are they going to get them? You guessed it. The place that took your cores, and is stockpiling them.
