Attention: We are closed June 30th to July 4th. Will re-open on July 7th.
We specialize in diagnosing and rebuilding transmissions in-house, without the dealership markup or chain shop shortcuts. Our Marietta transmission experts deliver honest assessments, precision rebuilds, and a 2-year warranty you can count on.
Serving Marietta, Cobb County and surrounding areas
Transmission Issues?
Schedule a free inspection
Your vehicle's computer has detected a possible transmission issue. Early diagnosis prevents costly repairs.
Vehicle stuck in gear or shifting unexpectedly? These issues signal transmission trouble that will worsen without attention.
Strange buzzing, humming, or clunking sounds when in neutral or changing gears may indicate transmission problems.
Red/brown spots under your car or burning smell indicate transmission fluid leaks that can cause major damage.
Our transmission warranty reflects our confidence in our work. With over 50 years of combined experience, our team delivers rebuilds that last—and we back them with a warranty that gives you real peace of mind. Trust the experts who truly stand behind their craftsmanship.
"Great people do great work here. Very knowledgeable owner and staff. They took time to answer every question I had and address every concern. The price was slightly less than another shop quoted me. This place exceeded my expectations and saved me some money. I hope I never need another transmission repair but if I do they have earned my business and I will highly recommend it to family and friends. Shout out to Angel. I appreciate you guys."
"They could have EASILY sold me something that I ASKED for but I didnt need, but went out of their way to explain the situation to me and why I didnt need it. These guys are straight shooters and honest. Will absolutely use them again."
"These Guys are Amazing and Honest! They did a rebuild on my Ram 2500 and I had some issues that were not anything that was their fault and they stood by their warranty and their word and fixed in a timely fashion. If you have transmission repairs or need diagnosis look no further. I have referred these Guys to many people and also another auto shop I know that does not do transmission work and they send their clients to these guys!"
Our shop is conveniently located in Marietta, GA, serving Cobb County, Woodstock, and East Cobb areas. We offer free diagnostics and upfront pricing on all transmission repairs and rebuilds.
What makes our rebuilds better:
Why Our Transmission Rebuilds Outperform Others
Our transmission rebuilds stand out because we take the extra steps most shops skip. We don’t just replace worn parts—we upgrade them with stronger components designed to outlast factory specifications. When we say “completely disassembled,” we mean it: every valve, solenoid, and clutch pack is individually inspected and either upgraded or replaced.
The common failure points we address include transmission valve bodies that develop internal leaks, solenoid packs that fail prematurely, and friction materials that wear unevenly. By reinforcing these vulnerable areas, we prevent the same problems from happening again.
Our testing process goes beyond basic road tests. We use advanced diagnostic equipment to verify proper shifting patterns, pressure readings, and temperature management before your vehicle leaves our shop. This thoroughness ensures you won’t experience unexpected problems after the repair.
The 2-year/24,000-mile warranty reflects our confidence in our work. Unlike remanufactured units that use the same parts that failed initially, our custom rebuilds are engineered to provide reliable service well beyond the warranty period.
For transmission repairs in Marietta that truly last, trust the specialists at Guardian Transmission. We don’t just fix your transmission—we improve it.
Opening Hours
