Call Us 1-407-295-1221 or Email us

Our large inventory of OEM Allison Transmission Parts includes a large line of new and rebuilt Allison automatic transmissions, and Allison Automatic transmission cores. All transmission parts can be shipped the same day in most cases. Call our Sales and Service Departments 1-407-295-1221 or Email us.

	Troubleshooting Charts For Allison Transmissions AT / MT (B) / HT / V
	The troubleshooting information contained in the following charts outlines the possible causes of transmission conditions and their remedies. Several possible causes are indicated; numbered items indicate suggested remedies for the causes. For Sales and Service Call America's #1 Supplier of OEM Allison Transmission Parts and Authorized Allison Dealer; TransDiesel Toll-Free: 1-800-422-1220,

A - ABNORMAL SHIFTS
          • Shifts Occur at Too High Speed
          • Shifts Occur at Too Low Speed - Full Throttle
          • Rough Shifts
          • No Specific Shift; i.e.., 1-2, 2-3, 3-4, 4-5 (Up or Down)
          • Excessive Engine Flare
B - ABNORMAL ACTIVITIES OR RESPONSES
          • Excessive Creep in First and Reverse Ranges
          • No Response to Movement of Shift Selector Lever
          • Vehicle Moves Forward in Neutral
          • Vehicle Moves Backward in Neutral
          • Reverse Warning Buzzer and/
            or Vehicle Backup Lights Come on During Forward Operation
C - ABNORMAL STALL CHECK SPEEDS
          • High Stall Speeds
          • Low Stall Speeds
          • Stall Speed 50% of Normal
D - LEAKING OIL
          • Oil Leaking Into Converter Housing
          • Transmission Fluid Leak at Output Shaft
E - LOW PRESSURES
          • Low Main Pressure in All Ranges
          • Low Main Pressure in First Range,
            Normal Pressure in Other Forward Ranges
          • Low Lubrication Pressure
F - CLUTCH(ES) SLIPPING
          • Slipping and Chatter in Only One Range
          • Slipping in All Forward Ranges
G - EXCESSIVE ENGINE FLARE
          • Excessive Engine Flare
H - OVERHEATING IN ALL RANGES
          • Overheating in All Ranges
I - TRANSMISSION THROWS FLUID OUT OF FILL TUBE AND/OR BREATHER
          • Transmission Throws Fluid Out of Fill Tube and/or Breather
J - DIRTY TRANSMISSION FLUID
          • Dirty Transmission Fluid
K - NOISE OCCURRING INTERMITTENTLY (BUZZING)
          • Noise Occurring Intermittently (Buzzing)
L - VEHICLE WILL NOT PUSH START
          • Vehicle Will Not Push Start
M - CLUTCH(ES) SLIPPING - AT 540/542/1542/543/545/1545
          • Slipping in Fourth and Reverse Ranges Only
          • Slipping in First and Reverse; OK in Other Forward Ranges
N - CLUTCH(ES) SLIPPING - MT(B) 640/643/650/653
          • Slipping in First and Reverse Ranges Only Slipping
            in second or Third (MT 640, 643) or Third or Fourth (MT 650, 653) Only
          • Slipping in Fourth and Reverse Ranges Only
          • Slipping in Low Range Only (MT 650, 653)
          • Slipping in All Forward Ranges
O - CLUTCH(ES) SLIPPING - MT(B) 644/647, 654CR
          • Slipping in First and Reverse Ranges Only (MT(B) 644/647)
          • Slipping in First and Reverse Ranges (MT 654CR)
          • Slipping in Second or Third Ranges Only (MT(B) 644/647)
          • Slipping in Third or Fourth Ranges Only (MT 654CR)
          • Slipping in Fourth and Reverse Ranges Only (MT(B) 644/647)
          • Slipping in Fifth and Reverse Ranges Only (MT(B) 654 CR)
          • Slipping in First Range Only (MT(B) 644/647)
          • Slipping in Second Range Only (MT(B) 654CR)
          • Slipping in All Forward Ranges
P - CLUTCH(ES) SLIPPING - HT 700
          • Slipping in All Forward Ranges
          • Slipping in Reverse Range
          • Slipping in High and Reverse Ranges
          • Slipping in Second or Third or Fourth Range (5-Speed)
          • Slipping in Second or Third or Fourth Range (5-Speed)
Q - CLUTCH(ES) SLIPPING - V 730
          • Slipping in First and Reverse Ranges Only
          • Slipping in Third Range Only
          • Slipping in Second Range Only
          • Slipping in Third and Reverse Ranges Only
R - RETARDER NOT FUNCTIONING PROPERLY
(Models With Output Retarder)
          • Excessive Retarder Response Time
          • No Retarder Operation at Low Speed
          • No Retarder Operation at High Speed
          • Low Main and/or Retarder Pressure
          • No Retarder Output
          • Harsh Retarder Apply
          • Retarder Will Not Release

Our large inventory of OEM Allison transmission parts includes a large line of new and rebuilt Allison automatic transmissions, and Allison Automatic transmission cores. All transmission parts can be shipped the same day in most cases. Call our Sales and Service Departments 1-407-295-1221 or Email.

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