Guaranteed Auto Transmission | Merrillville, IN

Welcome to Guaranteed Auto & Transmission Center of Merrillville, Indiana.

Guaranteed Muffler & Brakes Complete Auto Service is located in Merrillville, IN. We have sought to provide our customers with premier auto repair and maintenance services. We have quickly become one of the premiere service facilities in the Merrillville, IN, area. In addition to our more than 40 years of experience, we have a modern, well-equipped shop with the latest tools, diagnostic equipment, and technical information systems.

We service all makes and models of vehicles. Whether your vehicle is foreign or domestic, automatic or manual, or a truck or a car, Guaranteed Muffler & Brakes will be able to provide you with quality auto repair and maintenance. Even though we specialize in mufflers and brakes, our experienced technicians are skilled to perform any auto service.

There is no repair that we will not conduct for the benefit of our customers’ vehicles, and there is no part that we will not obtain for them either.  We do not just want to see our customers once or twice, but will impress you so much with our quality of service that you will continue coming to us.  We are sure of that, and that we will make new friends too.

When you are looking for an auto repair company in Merrillville, Gary, Hobart or Portage,  give us a call!

We look forward to servicing your car today and in the years to come!

Why choose us?

Your New Vehicle Warranty Remains ValidCustom Exhaust Systems

Some Customers are under the impression that only dealerships can service their vehicle in order to maintain the factory warranty. This is NOT TRUE. You must maintain your vehicle , but where you have it serviced is your choice. Guaranteed Muffler & Brakes Complete Auto Service’s Technicians will keep your vehicle in tip top shape.

Dealer Quality Work


  • We offer complete vehicle inspections with each visit.
  • Lower cost than the high priced dealership service department.
  • Extensive inventory of quality OE parts.
  • State of the art equipment, including the computer scanners of most vehicle manufacturers.
  • Friendly service representatives and technicians who listen to all your needs, and take the time to do it right.
  • We perform pre-purchase inspections before you buy a used car or truck.
  • We offer you the ability to schedule appointments on-line.
  • We accept after-market warranties.
Hobart Location
4625 West 37th Avenue (Ridge Road)
Hobart, Indiana 46342
Merrillville Location
Address: 5970 Broadway
Merrillville, Indiana 46410
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