Loss of Drive

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Loss of Drive

Checks	Cause
Torque Converter (1)	Broken lug or failed lug welds Sheared lug bolts Worn turbine shaft splines Low oil The pump hub is cracked, scored, or broken. Internal failure Failure of the closure weld The cover is cracked at a lug weld.
Pump (203)	The pump is seized. The pump gears are broken.
Case Extension Seal (20)	The seal is missing, damaged, or displaced.
Orifice Plate	The plate is missing or leaking around the edge.
Gasket (6)	Damaged
Oil Transfer Hole Cup Plug	The plug is leaking or missing.
Seals (503)	The seals are damaged or missing.
Housing (504)	The housing is broken.
Roller Clutch (512)	The clutch is worn, broken, or locked.
Carrier (514)	Broken
Pinions (518)	Broken free from the pilot Spalled pins or pinions Plugged pinion pin holes Worn thrust washers Lack of lube
Bearing (513)	The bearing is broken.
Roller Clutch (644)	The clutch is worn, broken, or locked. Lack of lube
Turbine Shaft (502)	The shaft or the splines are broken.
Forward Clutch Components
Seals (603, 604, 605)	Nicked or cut
Checkball	Leaking
Piston (606)	Cracked or jammed
Housing (602)	Cracked
Friction Plates (611)	The plates are burned or the splines are worn.
Reaction Plates (610)	The plates are worn or the splines are worn.
Spring Assembly (607)	Jammed
Driving Hub (615)	Broken
Retainer Ring (616)	The ring is not seated.
Driven Hub (613)	The gear teeth are worn.
Rear Gear Set
Pinions (655)	Broken or spalled
Pinion Pins (656)	Broken or spalled
Needle Bearings (654)	Broken or spalled
Sun Gear (649)	Broken or spalled
Pinion Thrust Washers (652)	Worn
Rear Internal Gear (666)	Broken or spalled
Front Internal Gear (661)	Broken or spalled
Turbine Shaft Ball Seal	Ineffective
Mainshaft (662)	The shaft or the splines are broken.
Fluid Pressure	Too low