Expert Buick Regal transmission service in Chicago. Free computer diagnostic, 2-year / 24,000-mile warranty on rebuilds, all years.
We will contact you as soon as a service member is available by call, text, or email.
2011 - 2017 Gen 1 (E2xx): 6-speed automatic (6T45/6T50) or 6-speed manual on GS; FWD or AWD 2018 - 2020 Gen 2 (K2xx): 9-speed automatic (9T50) on TourX and Sportback; FWD and AWD GS AWD: Active twin-clutch AWD; 310 hp 2.0T with 8-speed (8L45) Final US model year: 2020
Gen 1 Regal 6T45/6T50 follows wave plate and solenoid protocol. Gen 2 9T50 diagnosis checks TCM software first - GM calibration updates address both 1-2 harshness and shift hunting. GS 8L45 shudder: verify Dexron HP fluid, then torque converter if shudder persists. AWD coupling actuator failure is diagnosed independently from transmission by testing actuator motor response and coupling engagement under load.
6T45/6T50: Dexron VI; 8L45: Dexron HP; 9T50: Dexron HP; AWD coupling: GM Auto-Trak II or equivalent
Software update: same day; fluid service: same day; wave plate rebuild: 4 - 6 days; 9T50 solenoid: 1 - 2 days; full rebuild: 4 - 7 days
Every vehicle needs diagnosis before anyone can promise a repair path. These are the situations we help organize before you decide what to do next.
Tell us when it happens, whether reverse still works, and if warning lights are on. A scan and fluid check come before guessing at a rebuild.
Fluid condition, leak location, and driving distance matter. If the vehicle is slipping badly or overheating, towing may be the safer next step.
A failed solenoid, valve body, converter, or internal clutch problem can lead to very different repair paths. The goal is a clear diagnosis and written estimate.
The TourX 9T50 is generally reliable after software updates addressed early shift harshness. It is an underappreciated vehicle for Chicago commuters who need AWD wagon capability.
Torque converter clutch shudder on the 8L45 - same issue as other GM vehicles using this unit. Dexron HP fluid is essential. If your Regal GS has ever had Dexron VI in the 8L45, shudder is likely a result.
After GM calibration updates, yes. Early 2018 production had noticeable 1-2 harshness and shift hunting that was largely resolved by TCM updates in 2019. Updated units have been durable past 80,000 miles.
Yes - 6T45/6T50 parts are widely available due to their use across Chevy, Buick, and Opel platforms. Rebuild kits, solenoids, and wave plates are in stock.
The GS uses an active twin-clutch AWD system that can vector torque between wheels, not just split power front-to-rear. The active coupling is a separate assembly from the transmission and is maintained independently.
Same-day appointments available. Honest estimates, no surprises. We've been doing this since 1987.
