Engines and transmissions

What is fitted to the platforms in our database. The drivetrain is usually the single biggest reason a converter picks one bus over another.

Engines

Cummins B6.7
200–300 hp, OEM calibration dependent

The same engine family appears across several modern Type C and Type D buses. Confirm emissions year, rating plate, CPL and installed horsepower on the vehicle.

Fitted to: Blue Bird Vision Diesel, Thomas Saf-T-Liner C2, IC Bus CE Series, Blue Bird All American FE, Blue Bird All American RE, Thomas Saf-T-Liner EFX2, Thomas Saf-T-Liner HDX2
Cummins B6.7 Octane
200–300 hp

Gasoline version of the B6.7 platform. No DEF or diesel aftertreatment, but fuel availability, range and second-life support should be evaluated.

Fitted to: IC Bus CE Series
Cummins L9
260–300 hp in listed school-bus applications

Higher-displacement option associated with rear-engine Type D platforms. Verify cooling package, rear axle and transmission rating.

Fitted to: Blue Bird All American RE, Thomas Saf-T-Liner HDX2
Cummins X12
410 hp in MCI D-Series specification

Heavy-duty motorcoach engine. Coach-specific service access, 24-volt systems and emissions equipment differ sharply from school buses.

Fitted to: MCI J4500, MCI D4520
Volvo D13
435 hp in current Prevost passenger-coach specification

Prevost coach powertrain with DPF and SCR. Confirm exact generation and final record for any used shell.

Fitted to: Prevost H3-45, Prevost X3-45

Transmissions

Allison 2500 PTS

Some OEMs may program five usable forward ranges. Confirm exact transmission model and calibration from the data tag or Allison serial record.

Fitted to: Blue Bird Vision Diesel, Thomas Saf-T-Liner C2, Blue Bird All American FE, Blue Bird All American RE, Thomas Saf-T-Liner EFX2
Allison 3000 PTS

Available with an integral retarder in some applications. Transmission family availability does not establish the installed rear-axle ratio.

Fitted to: Blue Bird Vision Diesel, Thomas Saf-T-Liner C2, IC Bus CE Series, Blue Bird All American FE, Blue Bird All American RE, Thomas Saf-T-Liner HDX2
Allison 2000 Series

IC CE literature lists Allison 2000 and 3000 Series. Exact 2100/2200/2500/other model must be confirmed before publishing a ratio set for a specific bus.

Fitted to: IC Bus CE Series
Allison B500

Heavy-duty coach transmission. Verify generation, retarder configuration and programmed shift schedule.

Fitted to: MCI J4500, MCI D4520
Allison World 6-speed

Prevost literature identifies an Allison World 5th-generation six-speed and publishes drive-axle choices of 3.58 or 3.91. Confirm the specific transmission serial and coach final record.

Fitted to: Prevost H3-45, Prevost X3-45
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