Hyundai/Kia 7DCT450 7-Speed Wet Dual-Clutch Transaxle · Hyundai / Kia · Expert rebuild service since 1987. Lifetime warranty. Free diagnostic.
2012–present Hyundai Veloster N, 2019–present Kia Stinger (4-cylinder), 2019–present Hyundai i30 N, 2020–present Hyundai Elantra N, 2021–present Kia K5 (2.5T)
| Configuration | 7-speed wet dual-clutch transaxle (performance, higher torque) |
|---|---|
| Gear Ratios | 1st 3.83:1 · 2nd 2.29:1 · 3rd 1.53:1 · 4th 1.15:1 · 5th 0.87:1 · 6th 0.68:1 · 7th 0.54:1 · Rev 3.54:1 |
| Fluid Type | Hyundai/Kia DCT fluid (wet clutch — specific part number) |
| Fluid Capacity | 3.5 qts total (wet clutch lubrication sump) |
The 7DCT450 wet clutch handles more torque than the 7DCT300 but develops shudder under repeated performance launches and aggressive driving.
Symptoms: Clutch shudder after repeated performance starts, DTC P0810, judder at low speed after track session
TCU calibration issues affect early 7DCT450 units in N performance models. Software updates are the first diagnosis step.
Symptoms: Harsh downshifts, clutch engagement hesitation, hunting under light throttle
Track use of Veloster N and i30 N models accelerates wet clutch wear significantly. These applications are not rated for sustained track use.
Symptoms: Clutch slip under acceleration, DTC P0810, shudder after track sessions
7DCT450 rebuild replaces both wet clutch packs, TCU calibration update, and all seals. DCT-specific wet fluid used. Specialized dual-clutch tooling required.
DCT wet fluid every 40,000 miles — or after each track event in N performance models. The 7DCT450 is suitable for street performance but is not designed for sustained track use without aftermarket cooling upgrades.
Hyundai Veloster N, i30 N, Elantra N, Kia Stinger 4-cylinder, and Kia K5 2.5T with 7-speed wet DCT.
Yes — the 7DCT450 uses wet clutches instead of dry, making it more tolerant of stop-and-go traffic and performance driving.
If shudder appears after repeated aggressive starts or a track session, clutch pack wear or overheating is the cause. Allow the DCT to cool and have it inspected.
A full rebuild ranges $2,100–$2,700 at Chicago Transmission.
Occasional track days yes — sustained sessions require additional cooling. Change DCT fluid after any track event.
Free diagnostic, written estimate, lifetime warranty. Chicago's 7DCT450 rebuild specialists since 1987.
