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Overview
About this business
Tim's AATCO Transmissions is an automotive business serving the Portland Metro area from Beaverton, Oregon. Established in 1989, Tim's AATCO Transmissions specializes in transmission repair and rebuild services, offering free basic diagnostics and upfront, honest pricing. The business is locally owned and has built a reputation on straightforward communication, quality workmanship, and lasting repairs. Services include transmission repairs, rebuilds, clutch services, and work on transfer cases and differentials.
Transmission Shop
Services
Services and categories listed for this business.
Transmission RepairTransmission RebuildClutch ServicesTransfer Case RepairDifferential RepairFree Basic Diagnostic
Tim's Aatco Transmissions is the difference between a transmission repair and a full rebuild?+
Tim's Aatco Transmissions A repair fixes a specific component such as a solenoid or sensor without disassembling the entire transmission. A rebuild involves removing the transmission, tearing it down to an empty case, and replacing every worn part to build it back like new.
How long does a transmission rebuild take?+
Tim's Aatco Transmissions Generally, a transmission rebuild takes about one to two weeks depending on the vehicle and the condition found during disassembly.
Where is Tim's AATCO Transmissions located?+
Tim's Aatco Transmissions is located at 12295 Southwest Millikan Way, Beaverton, Oregon 97005.
Amazing service. Tim’s AATCO invested a ton of their time –probably two hours – chasing down an intermittent but significant transmission issue on my 1989 Toyota Land Cruiser, even taking it on two test drives to make the problem show itself. They figured it out and they didn't charge me. Even when I suggested they should.
They just said I should bring it in when it got worse, and consider some options in the meantime.
As a former mechanic I can say their diagnosis was careful, fair, and trustworthy. They didn’t push for a sale—if anything, they helped me avoid a repair I may not need.
I’d absolutely return to them and highly recommend the...Amazing service. Tim’s AATCO invested a ton of their time –probably two hours – chasing down an intermittent but significant transmission issue on my 1989 Toyota Land Cruiser, even taking it on two test drives to make the problem show itself. They figured it out and they didn't charge me. Even when I suggested they should.
They just said I should bring it in when it got worse, and consider some options in the meantime.
As a former mechanic I can say their diagnosis was careful, fair, and trustworthy. They didn’t push for a sale—if anything, they helped me avoid a repair I may not need.
I’d absolutely return to them and highly recommend their shop.
M
Matt Bell
Nov 26, 2025
★★★★★5.0
⭐⭐⭐⭐⭐
Honest, fast, and saved me thousands!
I brought my 2012 Jeep Liberty in because it was slipping badly between gears and I was 100% convinced the transmission was toast. The guy at the counter listened, put it up on the rack, checked the fluid level , topped it off and had me test-drive it. Ten minutes later it shifted perfectly again—no more slipping, no hard sell, no “you need a $5,000 rebuild.”
I’ve never experienced that level of honesty at a transmission shop. They easily could have taken me to the cleaners and I wouldn’t have known the difference. Instead, he didn’t charge me for the 3 qts of fluid they added. This place ju...⭐⭐⭐⭐⭐
Honest, fast, and saved me thousands!
I brought my 2012 Jeep Liberty in because it was slipping badly between gears and I was 100% convinced the transmission was toast. The guy at the counter listened, put it up on the rack, checked the fluid level , topped it off and had me test-drive it. Ten minutes later it shifted perfectly again—no more slipping, no hard sell, no “you need a $5,000 rebuild.”
I’ve never experienced that level of honesty at a transmission shop. They easily could have taken me to the cleaners and I wouldn’t have known the difference. Instead, he didn’t charge me for the 3 qts of fluid they added. This place just earned a customer for life. Highly recommend!
M
Molly Wright
Feb 4, 2026
★★★★★5.0
Incredible experience at Tim’s Transmission. Tim was friendly, honest, and fair. The complimentary transmission check gave me the information and peace of mind I needed while preparing to sell my SUV. Thank you, Tim. I will absolutely recommend your company to anyone in need of transmission services.
A
Avery Dela Cruz
Oct 13, 2025
★★★★★5.0
Tim and his crew saved me a ton of money on my 2009 toyota Rav4. They were able to diagnose the point of failure on my transmission in about 30 min and at no cost. The repairs were quick and saved me thousands of dollars on having to replace my transmission. Appreciate the work and care for the customer over at Tim’s!
M
Mark Haleston
Aug 18, 2025
★★★★★5.0
1990 Isuzu Trooper. Rebuilding a truck we had when my son was growing up. Needed to flush, fill and inspect all the 4 wheel drive running gear. Just like a pit crew I was in and out within an hour. Big difference, much quieter on the road especially freeway speeds. Shifts far more smooth ( 5 speed man) Tim is growing the business and a busy guy. Good communication and customer service. "Tranny Tim" Trust the pro's with your vehicle.
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