ASE Certified GMC & GM Transmission Repair

Serving SE Portland and Clackamas OR

Transmissions – CV Joints – Clutches
Performance Upgrades – Transfer Cases and Much More!!!


We service all GM & GMC Models

GMC auto repair, transmission and clutch repair in Clackamas Oregon by River City TransmissionAstro | General | Brigadier | Rally Van | Vandura Van | Safari Van | Savana Van | Suburban SUV | Jimmy SUV | Yukon SUV | Envoy SUV | Acadia SUV | Terrain SUV | Sierra Truck | Canyon Truck | Medium-Duty Trucks | Heavy-Duty Trucks

We only use GM OEM Parts


Important Consumer Information Regarding GM & GMC Transaxles

4L60E Transmissions – With these transmissions there are several points of failure. At River City Transmissions we do all the upgrades available. Some of these upgrades are the sun shell splines, as these can strip off, or the hub containing the splines break off causing you to loose 2nd, 4th and reverse gears. All GMC 4L60E Transmissions at River City Transmissions get a new hardened sun shell with every rebuild.

Another common problem is the 3/4 clutches and 2/4 bands get burned up. At River City Transmissions we use high energy lined clutches and bands to ensure a long life from these components. These are just a few of the many upgrades we do on every GMC transmission that comes through our shop. We want to make sure that our customers are able to enjoy their vehicles for many more miles to come.

With over 20 years experience our Master Transmission Builder has the knowledge and expertise to get your GMC vehicle back on the road. We are so confident in our transmission rebuilding that we give every transmission that comes through our shop a 12 month, 12,000 mile warranty FREE.

GM auto repair, transmission rebuild and clutch repair in south east Portland Oregon by River City TransmissionGM and GMC has developed a wide variety of transmissions and transaxles for their vehicles. For accurate phone support, it is necessary to have the year, make, model and engine size of the vehicle to correctly identify your transmission.

Thank you for choosing River City Transmissions for your GMC transmission repair.