Fig. 1180 shows the new AA-5558-F 4811 long spring used under the school bus. This spring can also be used under trucks equipped with 16-leaf springs when the customer prefers more spring resiliency. It should, however, be explained to the customer that, in replacing a 16-leaf spring with the 48″ long spring, the truck must not be overloaded. It will also be necessary to move the shackle bracket forward 12 3/8“, as described on page 544 of the March Bulletin, and install the new A-21309 bolt and AA-4773 nut as described above.
This spring is serviced less the spring clip and the pivot seat assembly and is listed in the parts book under part AA-5560-F.