Chrysler 42RE Automatic Transmission Service and Repair Manual (P/N 12Y04)

• Covers 1993–2004 Chrysler 42RE automatic transmissions, encompassing Grand Cherokee, Grand Wagoneer, 300M, Intrepid, and Concorde applications
• Third-party publication PN: 12Y04 by Automatic Transmission Service Group (ATSG), Techtran Manual 42RE-A500SE
• 106-page technical reference featuring 151 individual technical figures and detailed system-level cross-section diagrams
• Designed specifically for internal mechanical overhauls and transmission control module electronic diagnostics
• Highlights crucial subassemblies including the torque converter, oil pump, and front and rear servos
• Explores checkball locations, overrunning clutches, accumulators, selective measurements, and planetary geartrains

Transmission Analysis and Diagnostics

This technical PDF manual delivers an in-depth breakdown of the 42RE transmission. It begins with a comprehensive application chart and diagnostic fault codes. From there, the material transitions directly into hydraulic and governor pressure test procedures. Sections outline the exact disassembly, sub-assembly, and assembly routines. These step-by-step instructions for complete valve body overhauls and rebuilding the entire overdrive section allow mechanics and DIYers to tackle complex tasks that would otherwise require an expensive trip to a specialized transmission shop. You will find exploded-view illustrations for vital internal components like the planetary gear train, valve body, and overdrive section. Specialized chapters cover band adjustments, routine maintenance parameters, and electronic governor components. Complex transmission diagnosis charts are also included to assist with troubleshooting issues such as harsh engagement, slippage, or no-drive conditions.

When servicing the 42RE, technicians must be aware of common repair pitfalls. For instance, erratic shifting is frequently misdiagnosed as a major internal mechanical failure when the actual culprit is simply a contaminated governor pressure solenoid or a drifting sensor. Additionally, during overdrive clutch reassembly, mixing up the strict installation sequence of the flat, waved, and round wire snap rings will inevitably lead to an immediate unit failure. Working on automatic transmissions involves heavy components and pressurized hydraulic fluid. Always observe standard shop safety protocols and manufacturer guidelines before beginning any testing or teardown.

Specification and Hydraulic Data

Precise technical data is organized into accessible reference tables. For the daily workshop routine, this reference provides a significant advantage by detailing exact selective measurements and clearance specifications, thereby eliminating diagnostic guesswork on the bench and preventing the need to pull the transmission a second time for another repair. The manual provides specified clearances for oil pumps, planetary end play, and input shaft end play to ensure accurate unit rebuilding. Torque values are meticulously listed for all internal components. For instance, oil pump bolts require 20 Nm (15 ft-lbs) and valve body bolts are set to 12 Nm (100 in-lbs). Fluid capacities and specific electronic governor pressure curves are fully documented. Furthermore, the material includes essential visual aids such as hydraulic oil flow charts, checkball location views, and Ohms reading charts. Additionally, a complete wiring schematic maps out pinout functions for the transmission case connector and solenoid modules.