Allison MT600 series (MT643) Service Manual

Allison’s MT643 transmission is a good choice for a skoolie. It’s still a 4 speed with the same ratios as the AT545, but with a much higher power capability and a lock-up function in 3rd and 4th gears. Combined with a rear axle ratio of 4.44:1 or lower, a...

International/Navistar T444E Service Manual

The T444E is one of the most popular engines found in school buses between 1994 and 2004. This engine was used as the base platform for Ford’s 7.3 Powerstroke as well, sharing almost all mechanical components. The T444E replaced the 7.3 IDI that was produced...

Cummins B Series Operation and Maintenance Manual

The 12 valve, mechanical Cummins 5.9 engine is very popular in school buses between the late 1980s and the late 1990s. Originally introduced in 1984 for agricultural uses, it earned a solid reputation for reliability and longevity. This engine was also very popular in...

Allison AT545 Transmission Service Manual

The AT545 is the most popular transmission in school buses in the 1980s and 1990s and is generally a very reliable unit if you accept its limitations. Nearly every bus equipped with the Cummins 5.9 or Navistar T444E in a front engine configuration will be using the...

Adjusting The Air Brakes On Your School Bus

The majority of Skoolie owners don’t have any experience with big truck technology. One of those strange things is air brakes. While some buses have hydraulic brakes just like you would find in any normal car or truck, most are air powered. This comes with a...