Automatic Transmission Repair in Glendale, AZ

Sun West Transmissions — Glendale, AZ. Free estimates, honest diagnosis and a 3-year / 40,000-mile warranty on qualifying rebuilds and replacements.

Automatic Transmission Repair Done Right in Glendale

Most vehicles on the road today have an automatic transmission, and modern automatics are far more complex than the units of a generation ago. Six, eight, nine and ten forward speeds, computer-controlled shifting and tight-tolerance valve bodies mean that guessing at a repair is expensive. Sun West Transmissions is a dedicated transmission shop at 6116 West Northern Ave, and automatic transmission repair in Glendale, AZ is the core of what we do.

We start with a proper diagnosis, explain the results in plain English and give you a free estimate. Not every problem needs a rebuild, and we will tell you when a smaller repair will do the job.

Signs Your Automatic Transmission Needs Attention

• Slipping: engine RPM rises but the vehicle does not accelerate as it should. See our transmission slipping page.
• Harsh or delayed shifts: clunks, bangs or long pauses between gears.
• Delayed engagement: a pause after shifting into drive or reverse.
• Shudder: a vibration at steady speeds, often torque converter related.
• Warning lights: a check engine or transmission warning light, sometimes with limp mode.
• Leaks or burning smell: red or brown fluid under the vehicle, or a hot, burnt odor.
• No movement: the vehicle will not move in drive, reverse or both.

What Goes Wrong Inside an Automatic

An automatic transmission uses hydraulic pressure, clutch packs, bands, planetary gearsets (or, in some designs, parallel shafts) and a torque converter to deliver power. A computer, either a separate transmission control module or one built into the engine computer, controls shift timing through solenoids. Problems usually fall into a few categories.

Hydraulic and Valve Body Problems

The valve body routes fluid to apply clutches at the right moment. Worn bores, sticking valves and failing solenoids cause harsh, late or erratic shifts. Learn more on our valve body repair page.

Electrical and Control Problems

Bad sensors, damaged wiring, failing solenoids or outdated software can make a healthy transmission behave badly. These are often repairable without removing the transmission.

Mechanical Wear

Clutch packs, bands, bushings and seals wear over time. Heat makes this much worse. When friction material is gone or hard parts are damaged, a rebuild or replacement is usually needed.

Torque Converter Failure

The converter couples the engine to the transmission. Clutch shudder, lockup failure and internal damage are common. See our torque converter replacement page.

Our Automatic Transmission Repair Process

1. Listen: we ask when the problem happens, hot or cold, light throttle or heavy, and how long it has been going on.
2. Scan: we read codes and review live data from the engine and transmission modules.
3. Inspect: we check fluid level, condition and smell, and look for debris and leaks.
4. Road test: we verify the complaint and watch data such as slip, line pressure behavior and temperature.
5. Explain: we tell you what we found and give you a free estimate with your options.

Our transmission diagnostic testing page explains this process in more depth.

Repair Options We Offer

• Fluid and filter service with the correct fluid for your transmission.
• Solenoid replacement and wiring repair.
• Valve body repair or replacement.
• Software updates and relearns through TCM programming.
• Torque converter replacement.
• Leak repair, including seals, gaskets and cooler lines.
• Complete transmission rebuilds.
• Transmission replacement with remanufactured or quality used units.

Vehicles We Work On

We repair automatics in domestic and import cars, trucks, SUVs and vans, including GM, Ford, Ram, Jeep, Toyota, Honda, Nissan and more. We also work on CVTs, dual-clutch transmissions and heavy-duty diesel trucks. GM owners can view confirmed starting prices: a 4L60E rebuild starts at $2,795, a 4L80E at $2,995, a 6L80E at $4,495 and a 6L90E at $4,795, including removal and installation. See our 4L60E rebuild prices page for details. For other transmissions, cost depends on the vehicle and what we find, so call for a free quote.

Why Arizona Heat Matters

Heat is the leading cause of automatic transmission failure, and the Phoenix area is one of the hottest places in the country. Fluid breaks down faster, seals harden and clutches wear more quickly when temperatures stay high. Regular fluid service and good cooling are the best protection. Read our Arizona heat guide for more.

Why Choose Sun West Transmissions

We are a dedicated transmission shop serving Glendale and the West Valley, with free estimates and honest recommendations. Qualifying rebuilds and replacements come with our 3-year / 40,000-mile warranty with no deductible on covered repairs, and financing is available. We are open Monday through Friday 7:30 am to 5:30 pm and Saturday 8:00 am to 4:00 pm.

Automatic Transmission Repair FAQ

Does every transmission problem require a rebuild?

No. Many problems are electrical, hydraulic or fluid related and can be fixed with a smaller repair. Diagnosis tells us which.

Is it safe to keep driving with a slipping transmission?

It is best not to. Slipping creates heat that damages more parts. Read our driving with a bad transmission guide.

How do I get an estimate?

Call (623) 473-9800 or stop by our Glendale shop for a free estimate.