In most cases reverse is all mechanical and suggests an internal transmission problem, by that I mean there is no electrical influence that will cause no reverse. You have no first gear, is that drive range first gear, or manual 1st. If you have no manual first, it does have something in common with reverse, and that it relies on the lo/reverse band being applied. Drive, Drive 3, and second achieve first gear in different fashion. To be correct, the shifter lands in reverse, but there is no reverse motion. Here is a list of possibilities for no reverse/slips in reverse.
No Reverse or Slips in Reverse
Checks
Causes
Reverse Clutch
No apply or slipping
Piston and Seal Assembly (457)
Binding, cracked, or leaking
Inner Seal (456)
Plugged orifice
Clutch Plates (460-463)
Worn friction or broken splines
Snap Ring (459, 464)
Out of position
Housing (454)
Cracked, plugged feed holes, or broken tangs
Housing Retainer and Ball Assembly
Missing or out of position
Springs (458)
Binding
Reverse Clutch Fluid Routing
Fluid leak or restriction
Driven Sprocket Support (95)
"Â Leaking seal rings
"Â Porosity, damage, misalignment
Channel Plate and Gasket, and Valve Body, Gaskets, and Channel Plate
Porosity, fluid leak across the channels, misalignment, damage, or fluid restriction
Low and Reverse Band and Servo
No apply or slipping
Servo Piston (69)
Broken or binding
Servo Piston Seals (71, 72)
Leaking
Servo Pin (67) and Springs (66, 68)
Binding
Servo Cover (73)
Broken, loose, or leaking
Low and Reverse Band (111)
Broken, worn, or out of position
Anchor Pin (64)
Broken
Fluid Feed Tubes (83)
"Â Broken, bent, or plugged
"Â Missing or leaking seal rings
Transmission Case (1)
Porosity, fluid leak, or restriction
Shift Linkage
Disconnected or misaligned
Manual Valve (800) and Link (802)
Disconnected or misaligned
#1 Checkball
Missing, no low band fluid
Fluid Level
Low
Fluid Pressure
Low
Refer to High or Low Line Pressure.
And no first/slips in first
No First Gear, Slips in First Gear
Checks
Causes
Forward Clutch
No apply or slipping
Piston and Seal Assembly (607)
Binding, cracked, or leaking
Inner Seal (608)
Plugged orifice
Clutch Plates (601-604)
Worn friction, or broken splines
Snap Ring (600, 605)
Out of position
Housing (609)
Cracked, or plugged feed holes
Housing Retainer and Ball Assembly
Missing or out of position
Springs (606)
Binding
Input Sprag (515)
Damaged or not holding
Lo Roller Clutch (652)
Damaged or not holding
Forward Clutch Fluid Routing
Fluid leak or restriction
Oil Feed Tubes (83)
"Â Bent, broken, or plugged
"Â Leaking seal rings
Forward Clutch Support (114)
"Â Porosity
"Â Leaking or damaged seal rings
"Â Plugged feed holes
Channel Plate (27) and Gasket (28)
"Â Porosity
"Â Misalignment
"Â Fluid leaking across the channels
"Â Restriction
PSA (13)
Leaking drive switch O-ring
1-2 Shift Solenoid Valve (305)
"Â Failed OFF
"Â Leaking
1-2 Shift Valve (302)
Stuck in upshifted position
2-3 Shift Solenoid Valve (305)
"Â Failed ON
"Â Plugged exhaust
"Â Manual Valve (800)
"Â Shift Linkage
Misalignment
Torque Converter (55)
Stator roller clutch is not holding
Line Pressure
Low Pressure
Refer to High or Low Line Pressure.
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Thursday, October 21st, 2010 AT 12:01 AM
