Allison Transmissions

Shuttle Bus Model AT 545(R) up to 180 nhp (134 kW)

                                                         
Net input power (max)...........................180 hp (134 kW)
Input speed range......................2400 - 4000 rpm (diesel),
                                     3200 - 4400 rpm (gasoline)
Input speed range w/retarder option....2400 - 3600 rpm (diesel),
                                     3200 - 3600 rpm (gasoline)
Net input torque (max)......................380 lb ft (515 N·m)
Vehicle weight (GVW or GCW)..............26,500 lbs (12,020 kg)
                                         maximum standard load

Engine........................SAE 3 automotive flywheel housing
                                          with flex plate drive
Vehicle.....................One vertical mounting pad each side

Type........................Single-stage, 3-element, multiphase
Stall torque ratio.........................TC 230-2.60 (diesel); 
                   TC 270-1.96 (gasoline); TC 275-1.96 (diesel);
                                           TC 290-1.72 (diesel)

Type.........................Constant mesh, spur type planetary

        Range                                  Ratios*:
        First...................................3.45:1
        Second..................................2.25:1
        Third...................................1.41:1
        Fourth..................................1.00:1
        Reverse.................................5.02:1
          * Gear ratio does not include torque converter ratio.

Converter driven (SAE 6-bolt Regular Duty PTO)
Location...........................Right side (viewed from rear)
Drive gear ratio.............. All ranges--1.00 x turbine speed
Drive gear rating................200 lb ft (270 N·m) continuous; 
                               250 lb ft (340 N·m) intermittent

Oil type........................................Dexron® II, C 4
Capacity (excluding external circuit)...............20 U.S. qts 
                                                   (18.9 liters)
                                                (w/std. oil pan)
Filter...........Full flow, replaceable element, remote mounted 
Cooler...........................................Remote mounted 

(Filter and cooler not furnished on transmission assembly but is supplied 
 by vehicle manufacturer.)

Length..........................................27.2 in (692 mm)
Width...........................................20.7 in (526 mm) 
Height..........................................18.9 in (480 mm)
Weight (dry)....................................289 lbs (131 kg)

+NOTE: Vocational ratings may vary by vocation. 

	Designed for use with diesel and gasoline engines up to 180 nhp (134 kW). Four forward ranges and one reverse. This transmission model is best suited for shuttle, small city bus applications.
	Clutches are multidisc design, oil-cooled, hydraulically-operated and self-compensating for normal wear. Spur-type planetary gears are designed for strength, quietness and long life.
	Automatic upshifting and downshifting within each drive range. Built-in inhibitors prevent downshifts or shifts into reverse unless vehicle speed is within an acceptable range.
	The Allison three-element torque converter provides smooth, shock-free operation. A choice of converters permits matching the AT 545 to a wide variety of engines.
	Converter-driven power takeoff drive on right side of transmission (as viewed from the rear) is standard. Design is SAE 6-bolt.
	Provisions for neutral start switch, reverse signal switch, SAE regular-duty thread-type speedometer drive, and parking brake.
	5.3 inch oil pan is standard. Optional 3.8 inch oil pan is available when ground clearance dictates its use.
	An optional additional neutral position allows for "park brake" position on shift selector for application of an OEM-supplied parking brake system.

	Fare collection
	Defined route of operation
	Heavy start/stop operation
	Returns to same location at the end of the day
	Facilities for standing passengers
	No luggage facilities

	Regular service between cities
	Special events tours/charter
	No standing passengers
	Luggage provisions
	Premium motorhome chassis

	Airport/hotel/resort transportation
	May be "on call" demand or schedule
	Specialty such as trolley/paratransit/handicap
	Facilities for standing passengers