The Plymouth GTX was Plymouth's performance-oriented midsize muscle car, offered with high-output V8 power including the 426 HEMI. The 1970 Plymouth GTX factory service manual documents the specific engine for this model year.
High-Performance Engine Service
The GTX's V8 requires the correct oil specification and timing service documented in the factory manual, including HEMI-equipped models' significantly different torque values and service requirements.
What This GTX Manual Covers
- V8 engine including 426 HEMI — engine-specific service specs
- Manual or automatic transmission fluid specification and service
- Rear differential fluid service
- Complete electrical diagrams for all trim levels
