Corvette C7 Z06 automatic transmission 5U4L
5U4L is a specific GM Manufacturer/Unit Identification Code found on the transmission label of a 2015–2017 Corvette C7 Z06.
This code identifies a specific production run of the 8L90 (RPO M5U) 8-speed automatic transmission, matched to the supercharged 6.2L LT4 engine.
1. 5U4L Technical Specification
While “8L90” is the general model name, the 5U4L designation ensures the internal valving and torque converter are correctly spec’d for the Z06’s 650 hp / 650 lb-ft output.
| Category | Specification |
| Transmission Model | Hydra-Matic 8L90 (8-Speed Automatic) |
| Production Code | 5U4L |
| OEM Part Number | #24274891 (Commonly associated with 5U4L units) |
| Compatible Engine | 6.2L LT4 Supercharged V8 |
| Torque Capacity | 738 lb-ft (Gearbox Limit) |
2. Critical “Z06 vs. Stingray” Difference
For your inventory, it is vital not to confuse the 5U4L (Z06) with the 5USL or 5U1L (Stingray/Z51) units.
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Cooling Ports: The 5U4L features heavy-duty cooling ports designed to work with the Z06’s larger transmission cooler.
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Internal Clutches: The Z06 variant uses additional clutch plates in specific packs to handle the instant torque of the 1.7L Eaton supercharger.
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Torque Converter: The stall speed and lock-up clutch in the 5U4L are specifically tuned for the LT4 power curve. Installing a base Stingray unit in a Z06 will likely lead to premature clutch failure.
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