Mercedes-Benz GLS Transmission Repair Chicago
Expert Mercedes-Benz GLS transmission service in Chicago. Free computer diagnostic, lifetime warranty on rebuilds, all years.
Expert Mercedes-Benz GLS transmission service in Chicago. Free computer diagnostic, lifetime warranty on rebuilds, all years.
X166 GL-Class (2013–2016) / GLS (2017–2019): 7G-Tronic (722.9) 7-speed. X167 GLS (2020+): 9G-Tronic nine-speed automatic. AMG GLS 63: 4MATIC+ with AMG-specific 9G-Tronic tuning. 4MATIC AWD on all GLS models.
GLS conductor plate and valve body repairs follow identical procedures to S-Class and GLE. The X166/X167 4MATIC transfer case seal leaks should be addressed concurrently with transmission work — the transfer case fluid and transmission fluid are independent but both critical.
722.9: MB 236.14/236.15. 9G-Tronic: MB 236.17. Transfer case: MB 235.0 fluid. Change every 40,000 miles.
Conductor plate: 1–2 days. Full rebuild: 4–5 days. Transfer case seal: 1 day.
"Honest diagnosis, fair price, and the repair was done right. Chicago Transmission has been my go-to for years. Wouldn't trust anyone else with my car."
"The free diagnostic alone was worth the trip. They found the problem fast, gave me a written estimate, and completed the work on time. Exceptional service."
"Family owned and it shows. They treated my car like it was their own. The lifetime warranty on my rebuild gives me total peace of mind. Highly recommend."
Yes — same 722.9 or 9G-Tronic depending on year, same conductor plate vulnerability, same repairs.
Usually the transfer case seal or 4MATIC module — not the main transmission. We'll diagnose both.
$900–1,500 at Chicago Transmission vs. $2,000–3,500 at a Mercedes dealer.
More complex than 7G-Tronic, same fluid maintenance requirements. Change MB 236.17 every 40,000 miles.
AMG models run higher temperatures by design. A transmission temperature warning during sustained spirited use could indicate fluid degradation or cooling system issue — get a diagnostic.
Same-day appointments available. Honest estimates, no surprises. We've been doing this since 1987.
