Allison Transmissions
We can supply every model of transmission used in Yard Trucks. We can also supply parts and services for them. Some of the models include:

MT 634

General rating+

Net input power (max).............................250 hp (186 kW)
Input speed range................................2000 - 4000 rpm
Net input torque (max)........................640 lb ft (868 N m)
Vehicle weight (GVW or GCW)..........Up to 73,280 lbs (33,239 kg)    

Mounting

Direct..............SAE 2 flywheel housing with flex plate drive    

Torque converter

Type.........................Single-stage, 3-element, multiphase
Stall torque ratio.........TC 350-3.04; TC 360-2.86; TC 370-2.40;
                                        TC 378-2.27; TC 380-1.82
Lockup Clutch, automatic..................Effective in 3rd & 4th    

Gearing

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

         Range                                  Ratios*:
         First...................................3.58:1
         Second..................................2.09:1
         Third...................................1.39:1
         Fourth..................................1.00:1
         Reverse.................................5.67:1
           * Gear ratio does not include torque converter ratio.    

Power takeoff provision

Converter driven (SAE 6-bolt)
Location............................Right side (viewed from rear)
Drive gear ratio............... All ranges--1.00 x turbine speed
Drive gear rating.............................300 lb ft (407 N m)     

Oil system

Oil type....................................... Dexron  III, C 4
Capacity (excluding external circuit).....18 U.S. qts (17 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.)    

Size

Length..........................................30.4 in (773 mm)
Width...........................................19.3 in (489 mm)
Height (with  5.1" pan).........................22.4 in (568 mm)
Weight (dry)....................................510 lbs (231 kg)
Weight (dry) w/output retarder..................638 lbs (289 kg)
+NOTE: Vocational ratings may vary by vocation. 

MD 3060

Standard Rating
Gross input power (maximum).......................275 hp (205 kW)
Gross input torque (maximum).................800 lb ft (1085 N m)
Net input power (maximum).........................265 hp (198 kW)
Net input torque (maximum)...................780 lb ft (1058 N m)
Rated input speed (minimum-maximum)..............2000 - 2800 rpm
    

   
Specialty Rating
Gross input power (maximum).......................300 hp (224 kW)
Gross input torque (maximum).................950 lb ft (1288 N m)
Net input power (maximum).........................285 hp (213 kW)
Net input torque (maximum)...................905 lb ft (1227 N m)
Rated input speed (minimum-maximum)..............2000 - 2800 rpm
    

Mounting

Engine...................SAE 2 flywheel housing, flex disk drive
Chassis...................................Rear support available
                                (required for some installations)    

Torque converter

Type.........................One stage, three element, polyphase
Stall torque ratio.........TC 411-2.71; TC 413-2.44; TC 415-2.35;
              TC 417-2.20; TC 418-1.98; TC 419-2.02; TC 421-1.78
Lockup clutch with torsional damper............Integral/standard    

Gearing

Type.................Patented, constant mesh, helical, planetary

                                 MD 3060P               MD 3560P
         Range                    Ratios*                Ratios*
         First....................3.49:1 ................4.59:1
         Second...................1.86:1 ................2.25:1
         Third....................1.41:1 ................1.54:1
         Fourth...................1.00:1 ................1.00:1
         Fifth....................0.75:1 ................0.75:1
         Sixth....................0.65:1 ................0.65:1
         Reverse..................5.03:1 ................5.00:1
         Ratio coverage
         Forward..................5.34:1 ................7.05:1

           * Gear ratio does not include torque converter multiplication.    

Power Takeoff Provision

Optional power takeoff units.......Engine-driven, constant-drive,
                        265-335 lb ft (360-455 Nm) intermittent
                                   Engine-driven, clutched-drive,
                        265-335 lb ft (360-455 Nm) intermittent
                                   Engine-driven, clutched-drive,
                        415-575 lb ft (560-780 Nm) intermittent
Left or right side .....................................Standard
    

Oil system

Oil type...C4, MIL-L-2104, MIL-L-46167, Dexron-II, Dexron-IIIE
Capacity (excluding external circuits)...29 U.S. qts (28 liters)
Filter - main & cooler.............Replaceable element, integral 
Heat exchanger type....................Oil to water, integral or
                                          remote mount available 
    

Size

                                               MD 3060P/MD 3560
                                                 with PTO drive
Length (FW housing to output flange face........33.2 in (843 mm)
Depth...........................................12.8 in (325 mm)
Weight.......w/retarder..........................575 lb (261 kg)    

                                               MD 3060P/MD 3560
                                              without PTO drive
Length (FW housing to output flange face........29.0 in (736 mm)
Depth...........................................12.8 in (325 mm)
Weight (dry).....................................535 lb (243 kg)    

+Specialty vehicles cover: emergency vehicles, motorhomes, heavy equipment haulers, and
 tactical military vehicles. 
 Vocational shift calibrations vary by application.  Consult Allison Transmission
 Sales for specific information.    

We also supply OEM parts for all Allison transmission models, and rebuilt units aswell.