Transmission & Auto Repair

in Boise, ID & Surrounding Areas

Home Of The 3 Year / 36,000 Mile Warranty

Close-up of mechanical gears and a bearing inside a metal machine assembly

Restore performance with expert transmission rebuilding for automatic, manual, and CVT vehicles.   >

Close-up of a mechanic working on a car transmission with exposed gears and parts

Get reliable diagnostics and repairs for slipping, leaking, overheating, or shifting transmission issues.  >

Person using red test leads to check a car engine battery compartment

Keep your vehicle running strong with trusted auto repair, maintenance, brakes, diagnostics, and more.  >


Family-Owned Transmission Repair Shop Serving Boise & the Surrounding Areas

Red Line Transmission is a full service auto repair shop in Boise, ID, that specializes in transmission repair, replacement and maintenance. 

Automatic & Manual Transmission Repair

Transmission Maintenance

Transmission Rebuilding & Replacement

Engine Repair & Replacement

Clutch Repair

Complete Transmission & Auto Repair Services in Boise, ID

Full Service Auto Repair

Factory Auto Maintenance

Oil Change & Tune Up

Brake Repair & Driveline Repair

Performance Upgrades & Accessories

Blue-and-red sports-themed waiting area with chairs, counter, and TV in a small shop

30+ Years of Trusted Auto Repair Experience in Boise

With more than 30 years experience in automotive care, our team of highly skilled technicians offer fast services at fair prices for all makes and models of foreign and domestic cars, trucks and SUVs. From routine maintenance, such as oil changes and tune ups, to complicated engine diagnostics, brake repair and transmission overhauls, we really do it all and we do it right. Most services are backed by an industry leading warranty and we're happy to honor manufacturer warranties as well. When it is time for car care or transmission repair in Boise give, our local auto shop a call and we will be happy to schedule an appointment for you at your convenience.

Row of motorsport sponsor logos in red, black, and white on a white background
Row of assorted car brand logos on a white background
Row of motorsport sponsor logos in red, black, and white on a white background

As a locally owned business, the team at Red Line Transmission takes pride in assisting our friends and neighbors in Boise, Garden City and the surrounding towns. Weare committed to providing honest auto repair in Boise at the best prices possible. To ensure a quality experience, we've invested in the latest auto and transmission repair equipment to ensure we're able to properly service the cars that enter our nearby auto shop, including the newest vehicles on the road. We understand that the automotive world is changing and becoming more and more technologically advanced, so our techs undergo routine training to ensure we're up to date. No matter what you drive or what problem your car has, we can help. Give Red Line Transmission a call at 208-242-4896 to request a quote for the cost of auto repair in Boise or the surrounding communities. We promise to fix car trouble quickly and correctly and provide the finest dealer alternative maintenance services available.

Better Business Bureau accredited business logo in blue and white

Proudly Serving Boise, ID & Surrounding Areas

boise, Id

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Garden City, ID

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Kuna, ID

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Meridian, ID

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Star, ID

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Eagle, ID

Trusted by Boise Drivers for Transmission & Auto Repairs

Read Our Google Customer Reviews

★★★★★

“the work was excellent, and he backs it up...”


Alex has taken care of things on my car at no charge, and for the things that DID come with a bill, not only was he the best price in town, but the work was excellent, and he backs it up with his guarantee that it WILL be right!


— Kenneth C.

★★★★★

“I'm very pleased with the experience...”


I had the manual transmission in my Chevelle rebuilt by Redline transmission a few years ago. I’m very pleased with the experience. Accurate quote, fair price, quick work and still running strong.


— Gabriel O.

★★★★★

“got the job done without any unnecessary fuss...”


Compared a few shops for my transmission trouble, and Red Line Transmission won me over. They got the job done without any unnecessary fuss, and the pricing was reasonable. Solid choice for anyone needing reliable transmission services.


— Anthony M.

★★★★★

“they've got it all covered...”


Red Line Transmission saved the day for me. Fast service, fair prices, and a friendly crew. No need to look elsewhere for transmission issues – they've got it all covered.


— Mike S.

★★★★★

“the team was genuinely friendly...”


After a few bad experiences, Red Line Transmission restored my faith in auto shops. They were quick, didn't overcharge, and the team was genuinely friendly. It's my go-to place now, and I recommend it to anyone needing transmission help.


— Martha J.

Disassembled car transmission on a workshop floor with clutch parts and bolts scattered nearby

Our Blog

We invite you to monitor our News Blog for informative articles.

By Red Line Transmission • September 13, 2026
Transmission fluid is essential for keeping your vehicle's transmission lubricated, cool, and operating properly. When a leak develops, the fluid level can gradually drop and potentially cause increased friction, overheating, and accelerated wear on internal components. Transmission leaks can sometimes start small and go unnoticed until more serious symptoms develop. Recognizing the warning signs early can help you have the problem repaired before it leads to major transmission damage. At Red Line Transmission, we provide expert transmission fluid leak repair in the greater Boise area. Here’s a look at four warning signs of a transmission fluid leak. Fluid Spots Under Your Vehicle One of the most obvious signs of a transmission leak is finding fluid underneath your parked vehicle. Transmission fluid may appear red, pink, brown, or darker depending on its age and condition. The location of the fluid can provide a clue, but other vehicle fluids can also leak onto the ground. If you notice an unexplained puddle or recurring spots, have the vehicle professionally inspected to determine the source. Low Transmission Fluid A transmission that is losing fluid through a leak may eventually develop a low fluid level. Some vehicles have a transmission dipstick, while others require specialized procedures to check the fluid level. Low fluid can prevent the transmission from operating correctly and may increase heat and friction. If your fluid level is consistently low, simply adding more fluid isn't enough—the leak should be located and repaired. Delayed or Harsh Shifting Transmission fluid helps provide the hydraulic pressure necessary for smooth shifting. When fluid levels become too low, you may notice delayed engagement, hard shifting, hesitation, or slipping between gears. Continuing to drive with inadequate fluid can potentially worsen internal transmission damage. Burning Smell/Overheating A transmission leak can eventually lead to low fluid levels and increased operating temperatures. Excessive heat may cause transmission fluid to break down and produce a noticeable burning odor. You may also notice the transmission behaving differently after extended driving or while carrying heavy loads. A burning smell should be taken seriously because continued overheating can damage internal transmission components. Transmission Fluid Leak Repair in Boise For expert transmission fluid leak repair in Boise and the surrounding area, contact Red Line Transmission at  208-242-4896  . Feel free to give us a call to schedule an appointment for transmission services in greater Boise, ID!
By Red Line Transmission • August 8, 2026
A healthy suspension system does much more than provide a comfortable ride. It helps maintain tire contact with the road, improves steering and handling, and contributes to overall driving safety. The suspension consists of several components, such as shocks, struts, springs, control arms, bushings, and ball joints, all of which experience wear over time. When one or more of these parts begin to fail, your vehicle's performance and safety can suffer. At Red Line Transmission, our local mechanics provide expert suspension repair in the greater Boise, ID area. Here are four common warning signs of a suspension problem. Excessive Bouncing After Hitting Bumps One of the most obvious signs of suspension trouble is a vehicle that continues to bounce after driving over bumps. Healthy shocks and struts absorb impacts and quickly stabilize the vehicle. If your car continues to bounce several times after encountering a bump, your shocks or struts may be worn out. Excessive bouncing not only makes driving less comfortable—it also reduces your ability to maintain control. Uneven Tire Wear Suspension problems often cause tires to wear unevenly. Worn shocks and misaligned suspension components can prevent the tires from maintaining consistent contact with the road. You may notice excessive wear on one side of the tread. Addressing suspension issues promptly helps extend tire life while improving traction and handling. Pulling or Drifting While Driving If your vehicle pulls to one side or feels unstable while driving on a straight road, there may be a problem with the suspension or steering system. Worn suspension components can affect wheel alignment and reduce vehicle stability, making it more difficult to maintain a straight path. This issue can become especially noticeable during braking and cornering. Clunking or Knocking Noises Unusual noises coming from underneath your vehicle are often signs of worn suspension parts. Clunking, knocking, squeaking, or rattling sounds when driving over bumps may indicate worn bushings, ball joints, sway bar links, or other suspension components. These parts can loosen or deteriorate with age, allowing unwanted movement within the suspension system. A professional inspection can identify the source of the noise before more extensive damage occurs. Suspension Repair in Boise For expert auto repair in Boise and the surrounding area, contact Red Line Transmission at  208-242-4896  . Feel free to give us a call to schedule an appointment for auto repair or maintenance in greater Boise, ID!
By Red Line Transmission • July 6, 2026
Your vehicle's automatic transmission is one of its most complex and important systems. It’s responsible for transferring power from the engine to the wheels while automatically selecting the appropriate gear for driving conditions. Because transmissions contain numerous moving parts and sophisticated controls, many drivers have questions when problems arise. At Red Line Transmission, our local mechanics are happy to answer your questions about automatic transmission repair in the greater Boise area. What Are Common Symptoms of Automatic Transmission Problems? Some of the most common symptoms of automatic transmission trouble include delayed shifting, slipping gears, hard or jerky shifts, unusual noises, fluid leaks, and warning lights on the dashboard. Drivers may also notice a burning smell or poor acceleration. Any of these symptoms should be inspected promptly to prevent additional damage. What Causes Automatic Transmission Failure? Transmission problems can result from a variety of factors, including low or contaminated transmission fluid, overheating, worn internal components, and lack of maintenance. Over time, normal wear and tear can also affect clutches, seals, solenoids, and other transmission parts. How Often Should Transmission Fluid Be Changed? The recommended interval for transmission fluid service varies by manufacturer and vehicle type. Many vehicles benefit from fluid changes every 30,000 to 60,000 miles, while some newer models may have longer service intervals. Regular fluid maintenance helps keep internal components lubricated and reduces wear. Can I Continue Driving With Transmission Issues? While a vehicle may still operate with minor transmission symptoms, it’s generally not advisable to continue driving once problems are noticed. Transmission issues often worsen over time and can quickly lead to more extensive damage. Early diagnosis and repair are typically far less expensive than what you’d have to spend if the problem escalates. What Happens During a Transmission Inspection? A professional transmission inspection may include checking fluid condition and level, scanning for diagnostic trouble codes, performing a road test, and inspecting for leaks or visible damage. Technicians use this information to help determine the cause of the problem and recommend appropriate repairs. Where Can I Get Automatic Transmission Repair in Boise? For expert transmission repair in Boise and the surrounding area, contact Red Line Transmission at  208-242-4896  . Feel free to give us a call to schedule an appointment for transmission services in greater Boise !