Attention: We are closed June 30th to July 4th. Will re-open on July 7th.
Your transmission is your vehicle’s hardest-working component. From simple two-speeds to today’s complex 10-speed systems, transmission issues require true specialists with deep expertise and precision diagnostic equipment.
At Guardian Transmission, we custom–rebuild transmissions in-house to exceed factory standards—using only premium parts and meticulous craftsmanship.
We don’t just fix transmissions; we make them stronger, more reliable, and built to last longer than original factory builds. That’s why mechanics throughout Marietta trust us with their most challenging transmission repairs.
Before recommending any transmission repair, we follow a meticulous diagnostic process that other shops often skip. First, our specialists test-drive your vehicle to experience the issue firsthand. Then, we perform a comprehensive computer scan to identify trouble codes.
Finally, we conduct a detailed lift inspection to pinpoint the exact problem. This thorough approach means we don’t just treat symptoms—we fix the root cause. That’s why most vehicles with transmission warning lights don’t actually need a full rebuild. Our precise diagnostics save you thousands in unnecessary repairs while ensuring your transmission gets exactly what it needs-nothing more, nothing less.
Expert test-drives and computer scans that identify the exact problem without guesswork.
Preventative fluid and filter changes that extend your transmission's lifespan.
Hand-built rebuilds that outperform mass-produced units and factory standards.
Expert electronic diagnostics for seamless shifting and performance.
When your transmission needs attention, choose specialists who excel in what they do. We build every repair with precision craftsmanship. You’ll work directly with our transmission experts – no middlemen. Our 2-year/24,000-mile warranty ensures your peace of mind.
A short drive down I-575 for transmission expertise worth the trip.
Quick-response service available for Alpharetta drivers—just a short drive from our main shop.
From Medlock Bridge to State Bridge Road, Johns Creek drivers rely on us for honest, expert transmission care.
Easily accessible via GA-400 and East-West Connector.
Many Roswell residents choose us for our specialized transmission skills.
Reliable transmission repair for Mountain Park drivers, with expert care and no dealership runaround.
Opening Hours
