Transmission History by Year - Buick LaCrosse
2010 - 2016: 6T70 6-speed automatic (2.4L or 3.6L V6) 2017 - 2019: 8-speed automatic (2.5L or 3.6L)
Expert Buick LaCrosse 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.
2010 - 2016: 6T70 6-speed automatic (2.4L or 3.6L V6) 2017 - 2019: 8-speed automatic (2.5L or 3.6L)
6T70: SRV sleeve repair. TCC shudder: Dexron VI fluid exchange + converter inspection. 8-speed: valve body service.
Dexron VI
Verify exact spec on the dipstick label or owner's manual before fill. Recommended change interval: every 60,000 miles for normal driving, 30,000 miles under severe service (towing, stop-and-go, hot climates). Pan service typically takes 6 - 8 quarts; a full fluid exchange takes 10 - 14 quarts depending on cooler-line capacity.
1 - 3 days.
Fluid service and inspection complete the same day. Solenoid or sensor replacement: 1 day. Torque converter or seal repair: 2 - 3 days. Full rebuild with road test: 4 - 6 days. Time estimates assume parts in stock - call (312) 626-8759 to verify availability for your specific vehicle.
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.
Likely TCC shudder - very common on the 6T70 LaCrosse. Dexron VI fluid exchange is first; converter replacement if it persists.
Same 6T-family - the 6T70 in LaCrosse is larger than the 6T40 in Equinox but uses the same SRV repair approach.
1 - 3 days.
Extended fluid change intervals and high mileage. The bore wears and line pressure drops.
For a well-maintained LaCrosse body, yes.
Same-day appointments available. Honest estimates, no surprises. We've been doing this since 1987.
