The GM 4L80E transmission case fits a wide range of heavy-duty GM trucks, vans, and SUVs from 1991 to the mid-2000s, including Chevrolet/GMC C/K, Silverado/Sierra (2500/3500), Express/Savana vans, Suburbans, Yukon XLs, and Hummer H1s, but cases vary by year, especially pre-1995 (no MLPS provision) and 4×4 models (speed sensor differeces), requiring matching the case to the donor vehicle’s specific features for proper fitment and function.
Common Vehicles & Years:
- Trucks/SUVs: Chevy/GMC C/K, Silverado, Sierra 2500/3500 (1991–2007).
- Vans: Chevy/GMC G30/G3500, Express/Savana 2500/3500 (1991–2009+).
- SUVs: Chevy/GMC Suburban, Yukon XL 1500/2500 (1991–2007).
- Other: Chevy Avalanche 2500 (2002–2006), Hummer H1 (1992–2006).
- Workhorse: P-Series Step Vans & W-Series Chassis (1991–2009+).
Key Case Differences by Year (Important for Fitment):
- Pre-1995 Cases: Lack mounting bosses for the Manual Lever Position Sensor (MLPS) and have different EPC solenoid/speed sensor configurations for 4×4 models.
- 1995+ Cases: Feature the MLPS mounting holes and have updated electronics/sensor setups.
- 4×4 Models (Early vs. Late): Early (91-93) 4x4s have three speed sensors; later models (94+) have two, requiring specific case matching.
In Summary: While the core 4L80E design is consistent, cases are not perfectly interchangeable across all years due to electronic sensor provisions and mechanical differences, making year-specific matching crucial for swaps, note this YouTube video and this article.
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