Cross-Section | Features & Benefits | Typical Applications | SCAAN Specification Assistance

                                                         Transit
Gross input power (maximum).......................400 hp (298 kW)
Gross input torque (maximum)................1300 lb ft (1763 N�m)
Net Input power (maximum).........................375 hp (280 kW)
Net input torque (maximum)..................1200 lb ft (1627 N�m)
Rated input speed (minimum-maximum)..............1700 - 2300 rpm
      

                                                       Intercity
Gross input power (maximum).......................450 hp (336 kW)
Gross input torque (maximum)................1460 lb ft (1979 N�m)
Net Input power (maximum).........................445 hp (332 kW)
Net input torque (maximum)..................1435 lb ft (1946 N�m)
Rated input speed (minimum-maximum)..............1700 - 2300 rpm      

Mounting

Engine..................SAE #1 flywheel housing, flex disk drive
Chassis............18 bolt min. flange mount or 6 bolt side pads      

Torque converter

Type.........................One-stage, three element, polyphase
Stall torque ratio............TC 521-2.4; TC 531-2.3; TC 541-1.9
                                          TC 551-1.8; TC 561-1.6
Lockup clutch with torsional damper............Integral/standard
                                        (available in all ranges)
      

Gearing

Type...............Patented, constant mesh, helical, planetary.
                  Available in 4,5 or 6-speed shift calibrations.
         Range                                  Ratios*:
         First...................................3.51:1
         Second..................................1.91:1
         Third...................................1.43:1
         Fourth..................................1.00:1
         Fifth...................................0.74:1
         Sixth...................................0.64:1
         Reverse.................................4.80:1
         Ratio Coverage 
         Forward (5 speed).......................5.48:1
           * Gear ratios do not include torque converter multiplication.      

Oil system

Oil type....C4, MIL-L-2104, MIL-L-46167, DEXRON�-II, DEXRON�-IIE
Capacity.............................(excluding external circuit)
                             Initial fill 47 U.S. qts (45 liters)
Oil change............................... 37 U.S. qts (39 liters)
Filters-main & cooler..............Replaceable element, integral
Heat exchanger type................Oil to water, direct-mount or
                                          remote-mount available
      

Size

                                                          B 500
Length (FW housing to outputflange face)........34.0 in (865 mm)
Depth (centerline to lowest point)..............13.1 in (328 mm)
Weight (dry)**..................................831 lbs (378 kg)
                                                         B 500R
Length (FW housing to outputflange face)........34.0 in (865 mm)
Depth (centerline to lowest point)..............13.1 in (328 mm)
Weight (dry)**..................................906 lbs (412 kg)
**Weight inclues output flange/yoke and adaptation.      

Transmission Cross-section (go to top)

Design Features (go to top)

	The WT Bus Series incorporates the latest technology in design and manufacturing techniques.
	Hydraulic torque converter with lockup clutch and integral torsional vibration damper, planetary gear package, and oil pump on one concentric axis.
	Unique patented helical gear arrangement provides up to 6 speeds in a compact package.
	The electronic control system is standard equipment. This includes a bus pushbutton selector and wiring harness.
	Integral externally accessible cartridge type oil filters simplify maintenance.
	Pressure balanced rotating clutches provide quick, smooth shifts.
	Adaptive controls tailor shifts to the driving conditions.
	The B 500R includes as standard: Integral retarder Remote oil cooler Output flange/yoke Engine adaptation* Shallow sump for ground clearance Oil level sensor Two year bus warranty Secondary shift schedule Integral pushbutton or lever selector and max feature ECU Throttle position sensor (TPS) Wiring harness Vehicle interface module (VIM)

Certain features listed above can be handled as delete options.

The following add options are available direct from Allison and also carry the full WT transmission warranty:

	Remote shift selector
	Power takeoff provision (adds 3.8 in to length of transmission)
	Power takeoff units
	Direct-mount oil cooler

*Base price will vary if other than specified adaptation is requested

Typical Applications (go to top)

	Transit Bus
	Intercity Bus
	Intercity/Tour Bus
	Articulated Transit Bus

Areas of the world may differ in approved models

SCAAN Specification Assistance (go to top)

To be sure that you get the most efficient engine/transmission package for your operation, in your territory, with your preferred vehicle, your local Allison Transmission distributor offers SCAAN (System for Computerized Application ANalysis) to help take the guesswork out of vehicle-buying specification decisions.

SCAAN can compute a wide variety of vehicle performance parameters; and will also check your powertrain specifications against Allison Transmission vocational experience to optimize vehicle performance.