Allison Transmissions

Automatic Model AT 542 up to 235 nhp (175 kW)

                                                         AT 542
Net input power (max)............................235 hp (175 kW)
Input speed range,
full load governed......................2400 - 4000 rpm (diesel),
                                      3200 - 4400 rpm (gasoline)
Input speed range,
full load governed w/retarder option....2400 - 3600 rpm (diesel),
                                      3200 - 3600 rpm (gasoline)
Net input torque (max).......................445 lb ft (603 N·m)
Vehicle weight......................Up to 22,050 lbs (10,002 kg)      

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

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

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® IIE;, Dexron® III, C 4
Capacity (excluding external circuit)...15 U.S. qts (14.2 liters)
                                                         (approx)
Sump....................................................Integral

     

Length..........................................27.2 in (692 mm)
Width...........................................19.8 in (503 mm)
Height............(with standard 3.8" oil pan)..18.9 in (480 mm)
Depth Below Center Line..........................9.7 in (246 mm)
Weight (dry)....................................289 lbs (131 kg)
Weight (dry w/retarder option)..................329 lbs (149 kg)
+NOTE: Vocational ratings may vary by vocation. 
*NOTE:  The PTO provision is not available on the retarder models.      

	The AT 542 will accommodate gasoline or diesel engines up to 235 net hp (175 kW). This automatic is best suited for light- or medium-duty applications of a multi-stop nature such as mini/midi school buses, general P&D, shuttle buses, step vans and motorhomes.
	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. The truck-proven spur-type planetary gearing is built for strength, quietness and long life. The range clutches are disk-type, oil-cooled, hydraulically-operated and self-compensating for normal wear.
	Converter-driven power takeoff drive on right side of transmission (as viewed from the rear) is standard on non-retarder models. Design is SAE 6-bolt.
	Provisions for neutral start switch, reverse signal switch, SAE regular-duty thread-type speedometer drive, electronic speedometer drive and parking brake.
	3.8 inch oil pan is standard. 5.3 inch oil pan is standard on retarder models.
	An optional additional neutral position allows for "park brake" position on the shift selector for application of an OEM-supplied parking brake system.
	Optional input retarder with power absorption capacity of 160 hp at 2600 rpm for vehicle downhill speed control. This option requires the 5.3 inch oil pan.

	Emergency Vehicle
	Utility Truck
	P&D Truck
	Airport Shuttle
	Street Sweeper
	Flat Bed Truck
	Tanker
	Stepvan
	Motorhome
	School Bus
	Other applications are available. Consult your local distributor for details.