This Allison 4th Generation Controls in-chassis maintenance manual (publication GN4008EN) provides complete troubleshooting, fluid leak diagnosis, component replacement, and parking brake service procedures for the 1000 and 2000 Product Family transmissions. It was published by Allison Transmission in January 2007 and spans 83 pages of detailed, shop-level instructions intended for technicians performing repairs without removing the transmission from the vehicle.
Official Allison 4th Generation Controls document details
| Brand | Allison Transmission |
| Model coverage | 1000 Product Family, 2000 Product Family |
| System / Group | 4th Generation Controls — In-Chassis Maintenance |
| Publication no. | GN4008EN (cross-referenced MT4108EN) |
| Year / Revision | January 2007 |
| Pages | 83 |
| File size | 1.6 MB |
| Format | |
| Language | English |
Document table of contents
- Section I — Troubleshooting: General troubleshooting information, performance complaints, transmission stall test and neutral cool-down test, pressure schedule verification
- Section II — Fluid Leak Diagnosis: Finding the leak
- Section III — Shift Selector Cable Linkage: Shift selector and cable/linkage, Internal Mode Switch (IMS)
- Section IV — Selector Shaft Seal Replacement: Removal and installation
- Section V — Parking Brake: Adjustment, replacement, burnishing
- Section VI — Component Replacement: Output flange/yoke, tachograph plug, speed sensor, PTO cover/gasket, cooler manifold gasket, rear seal, oil pan gasket, suction filter and seal, control valve components, front seal, cooler flushing
- Section VII — Customer Service: Owner assistance, service literature
Applicable truck models
This manual applies to all vehicles equipped with Allison 1000 and 2000 series automatic transmissions using 4th Generation electronic controls. These transmissions are commonly installed in medium-duty trucks, buses (including school/pupil transport and emergency vehicles), motorhomes, and highway-series commercial vehicles from multiple OEMs. The document references companion publications including Service Manual SM4006EN, Mechanic’s Tips MT4007EN, Troubleshooting Manual TS3977EN, and the Allison DOC service tool guide GN3433EN. The Transmission Control Module (TCM), CHECK TRANS light behavior, and OBD-II compliance are discussed throughout the troubleshooting section. Torque specifications are provided in both metric and imperial units for components such as tachograph plugs (60–67 N·m), oil pan bolts (24–29 N·m), and drain plugs (30–40 N·m). For official product information, visit Allison Transmission’s website.
Who needs this Allison 4th Generation Controls manual
Fleet mechanics, independent workshop technicians, and service managers responsible for maintaining vehicles with Allison 1000/2000 transmissions need this manual. It eliminates guesswork during in-chassis repairs by providing structured diagnostic tables, step-by-step seal and sensor replacement procedures, and verified pressure schedules.
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