Transmission trouble, handled the right way.

Serving Portland Metro since 1989.

Our Promise

Straight answers. Fair prices. Built to last.

Free Basic Diagnostic

(15–20 minutes)

Honest Pricing

(up-front quote for the entire job)

Repairs Built to Last

(better-than-factory updates)

Local & Trusted

(family-owned, serving Portland Metro for 35+ years)

A Proud Member:

BBB Accredited business

Drivers have trusted Tim’s AATCO Transmissions — for decades.

Our strongest endorsement is our customers. From repeat customers to referrals from local shops and dealerships, Tim’s AATCO Transmissions is trusted to handle the tough jobs.

How It Works
at Tim’s AATCO Transmissions


1. Diagnostic

Sometimes we can give you a solid idea of the issue and cost right over the phone. When it’s not clear, we’ll do a free 15–20 minute in-shop diagnostic to confirm what’s really going on.


2. Options

In some cases a repair is all that’s needed; in others, a full rebuild is the right path. We’ll explain what we find and share our recommendation so you can make the choice that works best for you.


3. Quote

You’ll get an honest, out-the-door quote for the full job. No hidden fees. No surprises.


4. Repair or Rebuild

If a repair is possible, we fix what’s needed using quality parts. If a rebuild is required, we include proven updates that often make your transmission stronger than factory.


5. Post-Care

After the work is done, we invite you back for a 10-day checkup to be sure everything’s clean, tight, and driving right.

503-626-4619

Tim vs. the Dealer

Dealerships usually have one option: replace your transmission with the same stock unit. At Tim’s AATCO Transmissions, you have more choices. If a repair will do the job, we’ll fix it without a full rebuild. And when a rebuild is needed, we install proven upgrades whenever possible — making your transmission stronger than factory, built to last, and usually for thousands less.

Result: Stronger than factory. Usually for thousands less.

What We Work On

  • Automatic & manual transmissions
  • Clutch systems
  • Transfer cases
  • Differentials
  • Heavy-duty builds.
  • Most makes & models — foreign & domestic.

Get back on the road with confidence.