Corvette C7 3.42 differential
Buy Mustang parts Ltd, the 3.42 Rear Differential is a cornerstone of your C7 inventory. In the C7 generation (2014–2019), the 3.42 ratio (RPO GU6) is exclusively paired with the 7-speed manual transmission (TR-6070).
Because the C7 uses a transaxle design, the differential is a separate unit bolted directly to the rear of the transmission.
1. eLSD vs. Mechanical LSD
The most critical distinction for your listings is whether the unit is an Electronic Limited-Slip (eLSD) or a Mechanical Limited-Slip (mLSD). They are not interchangeable without significant software and hardware modifications.
| Feature | Base Stingray (mLSD) | Z51, Z06, GS, ZR1 (eLSD) |
| Differential Type | Mechanical Clutch Pack | Hydraulically Actuated Electronic |
| Cooling | Typically No External Cooler | Internal Cooler & External Lines |
| Common Part # | #23255924 | #23213561 / #23231297 |
| Usage | Standard 7-Speed Manual | All Performance Manual Models |
2. Technical Identifiers
When sourcing these units, look for these specific “tags” to confirm the 3.42 ratio and performance spec:
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RPO Code GU6: Confirms the 3.42 axle ratio.
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PO G96: Confirms the Electronic Limited Slip (required for Z51/Z06).
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RPO KNR: Indicates the unit has the ports for the Differential Oil Cooler. This is a major selling point for track-oriented buyers.
3. Market Value & Resale (2026)
The 3.42 differential is highly sought after by owners of automatic (A8) Corvettes looking to “gear down” for better acceleration (though this requires a complex TCM tune), as well as manual owners replacing damaged units.
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OEM New (Dealer): $3,200 – $3,800.
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Used “Take-Off” (Tested): $1,400 – $2,100.
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Remanufactured: $2,500 – $2,900.
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