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ALLISON AT 545 SPECIFICATIONS
General Purpose Truck and Motorhome Rating
Net input power 235 hp (175 kW)
Net input torque 445 lb-ft (603 N·m)
Vehicle weight Up to 30,000 lbs (13,608 kg) GVW or GCW
Airport Shuttle Bus Rating
Net input power 180 hp (134 kW)
Net input torque 380 lb-ft (515 N·m)
Vehicle weight Up to 26,500 lbs (12,020 kg) GVW
School Bus, Intercity Bus and Shuttle Bus Rating
Net input power 235 hp (175 kW)
Net input torque 445 lb-ft (603 N·m)
Vehicle weight Up to 30,000 lbs (13,608 kg) GVW
Refuse Vehicle Rating
Net input power 235 hp (175 kW)
Net input torque 445 lb-ft (603 N·m)
Vehicle weight Up to 22,050 lbs (10,002 kg) GVW

ENGINE INTERFACE
Acceptable full-load engine governed speed 2400-4000 rpm (diesel)
3200-4000 rpm (gasoline)
Minimum engine idle speed
(with transmission in drive) 500 rpm

MOUNTING
Engine SAE No. 3
Chassis Two-bolt mounting pad, each side
(Rear support required for some installations)

TORQUE CONVERTER STALL TORQUE RATIO Kp-FACTOR* AT STALL
TC-275 1.96 115.5 (99.2)
TC-290 1.72 94.1 (80.8)
*Kp-Factor defines torque converter capacity. Kp = the ratio of converter pump speed [rpm] divided by the square of pump torque [lb-ft (N·m)].

MECHANICAL RATIOS (RANGE)*
First
3.45:1
Second
2.25:1
Third
1.41:1
Fourth
1.00:1
Reverse
-5.03:1

RATIO COVERAGE
Forward
3.45
*Gear ratio does not include torque converter multiplication.

CONTROL SYSTEM
Description Hydraulic
Driver-to-Transmission Interface Customer furnished cab-mounted shift selector

OPTIONAL CONVERTER-DRIVEN POWER TAKEOFF PROVISION ? RIGHT SIDE
PTO drive gear rating Intermittent ? 1.00 x turbine speed, 250 lb-ft (339 N·m)
Continuous ? 1.00 x turbine speed, 200 lb-ft (271 N·m)
NOTE: Retarder provision is not available if this option is selected

SPEEDOMETER PROVISION (Only one may be specified)
Speed Sensor Gear 16-tooth gear for magnetic pickup
Mechanical Drive Gear 5-tooth helical drive gear for mechanical driven gear
Mechanical Drive Gear 8-tooth helical drive gear for mechanical driven gear
Location Rear section of transmission housing

OPTIONAL RETARDER PROVISION
Input
Integral, hydraulic
Capacity at 2600 rpm
Torque Power

355 lb-ft (480 N·m) 175 hp (130 kW)
NOTE: Converter-driven PTO provision is not available if this option is selected

OIL SYSTEM
Oil type Dexron® III, C4
Capacity (excluding external circuit) 20.0 qts (18.9 liters) standard oil pan
Capacity (excluding external circuit) 15.0 qts (14.2 liters) optional shallow oil pan
Filters ? main and cooler (optional) Replaceable element, remote mounted

SIZE
Length* 27.2 in (691 mm)
Depth (below transmission centerline w/standard oil pan) 11.2 in (284 mm)
Depth (below transmission centerline w/optional shallow oil pan) 9.7 in (246 mm)
Weight 267 lbs (121 kg)
Weight (dry with PTO) 275 lbs (125 kg)
Weight (dry with retarder) 315 lbs (143 kg)