Allison Transmissions

Automatic Model AT 1545 up to 235 nhp (175 kW)

Net input power (max)...................180 hp (134 kW) (diesel),
                                     200 nhp (149 kw) (gasoline)
Input speed range.......................2400 - 4000 rpm (diesel),
                                      3200 - 4400 rpm (gasoline)
Net input torque (max).......................405 lb ft (551 N·m)
Vehicle weight (GVW or GCW).........up to 24,250 lbs (11,010 kg)    

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 275-1.96; TC 290-1.72
Lockup Clutch, automatic..................Effective in 3rd & 4th    

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, Dexron® III, 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 

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

Length..........................................27.2 in (692 mm)
Width...........................................19.8 in (503 mm)
Height............(with standard 5.3" oil pan)..20.4 in (519 mm)
Depth Below Center Line.........................11.2 in (284 mm)
Weight (dry)....................................302 lbs (137 kg)

+NOTE: Vocational ratings may vary by vocation.     

	Designed for use with diesel engines up to 180 nhp and gasoline engines up to 200 nhp. Four forward ranges and one reverse. This transmission model is best suited for school buses, fuel delivery, beverage delivery, general P&D, limited transit coach and light-duty dump truck 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 1545 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, electronic speedometer drive and parking brake.
	5.3 inch oil pan is standard. Optional shallow oil pan is available when ground clearance dictates its use.
	An optional additional neutral position allows for "park brake" position on the shift selector for application of an OEM-supplied parking brake system.

	Stepvan
	Tanker Truck
	P&D Truck
	Emergency Vehicle
	Lease/Rental Vehicle
	Refrigerated Van
	Motorhome
	School Bus
	Flat Bed Truck
	Small Wrecker
	Utility Truck
	Road Sweeper
	Other applications are available.