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

Garden City, ID

Kuna, ID

Meridian, ID

Star, ID

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 June 11, 2026
Your vehicle’s cooling system plays a critical role in regulating engine temperature and preventing overheating. Even small cooling system problems can quickly turn into major mechanical failures if they are ignored for long. Because engines generate significant heat during normal operation, every part of the cooling system must function properly to protect critical components. Recognizing warning signs early and scheduling repairs promptly can help prevent expensive engine damage. At Red Line Transmission, our local mechanics provide expert cooling system repair in the greater Boise, ID area. Here are four cooling system issues that should always be repaired right away. Coolant Leaks Coolant leaks are one of the most common and serious cooling system problems. Leaks may develop from hoses, the radiator, the water pump, or other components within the system. Low coolant levels reduce the system’s ability to regulate engine temperature and can quickly lead to overheating. Promptly repairing coolant leaks helps protect the engine from severe heat-related damage. Damaged Radiator The radiator is responsible for releasing heat from the coolant as it circulates through the system. Cracks, corrosion, clogs, or leaks within the radiator can reduce cooling efficiency and increase the risk of overheating. A damaged radiator may also allow coolant to escape, further worsening temperature control problems. Repairing or replacing a faulty radiator quickly helps maintain proper engine cooling. Failing Water Pump The water pump is responsible for circulating coolant through the engine and radiator. If the water pump begins failing, coolant flow may become restricted, causing overheating. Signs of water pump trouble may include coolant leaks, whining noises, or fluctuating engine temperatures. Faulty Thermostat The thermostat regulates coolant flow based on engine temperature. A malfunctioning thermostat may become stuck, preventing the cooling system from operating correctly. A stuck thermostat can cause overheating that leads to damage. Replacing a faulty thermostat promptly helps restore proper cooling system operation and prevent additional engine stress. Cooling System 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 make an appointment for auto repair or maintenance in greater Boise, ID !
By Red Line Transmission May 9, 2026
Your vehicle’s transmission depends on clean, properly maintained fluid to lubricate components, regulate temperature, and ensure smooth shifting. When a transmission fluid leak develops, it can quickly lead to serious performance problems and expensive repairs if ignored. Because transmission systems are complex, many drivers are unsure what causes leaks, how serious they are, or when repairs are necessary. At Red Line Transmission, our local mechanics are happy to answer your questions about transmission fluid leak repair in the greater Boise area. What Are the Warning Signs of a Transmission Fluid Leak? One of the most common signs of a transmission fluid leak is finding red or reddish-brown fluid underneath your vehicle. You may also notice delayed shifting, slipping gears, unusual noises, or a burning smell while driving. In some cases, the transmission may overheat or a warning light may come on. Because transmission fluid is essential for proper operation, even a small leak should be taken seriously. What Causes Transmission Fluid Leaks? Transmission fluid leaks can develop for several reasons. Worn seals and gaskets are a common cause, especially as vehicles age. Cracked transmission pans and damaged lines can also allow fluid to escape. Is It Safe to Drive with a Transmission Fluid Leak? Driving with a transmission fluid leak is risky because low fluid levels can quickly damage the transmission. Without enough fluid, internal components may overheat or suffer excessive friction, leading to serious mechanical problems. While a small leak may not cause immediate issues, continuing to drive without repairs could turn a relatively minor problem into a costly transmission rebuild or replacement. How Are Transmission Fluid Leaks Repaired? The repair process depends on the source and severity of the leak. Mechanics typically begin by inspecting the transmission and cleaning the area to identify exactly where the fluid is escaping. Repairs may involve replacing seals, gaskets, lines, or the transmission pan. After repairs are completed, the transmission fluid is commonly refilled or replaced to ensure proper performance. Where Can I Get 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 make an appointment for transmission services in greater Boise, ID !
By Red Line Transmission April 30, 2026
By providing both lubrication and hydraulic pressure, transmission fluid plays a crucial role in keeping your transmission healthy and functioning optimally. If your transmission fluid level gets too low, then very expensive problems could develop. By checking your transmission fluid on a monthly basis, you can make sure that the fluid level isn’t dropping to the point that major problems could arise. If low fluid does cause issues with your transmission, you’ll want to be proactive about getting to the shop ASAP. At Red Line Transmission, we specialize in transmission service in the greater Boise area. Our experienced transmission specialists can accurately locate the source of transmission fluid leaks and get right to work on fixing them. Signs of Low Transmission Fluid When transmission fluid gets low, an assortment of issues may arise. With insufficient fluid, a significant delay in shifting could occur because there’s not enough pressure to get gears to change as quickly as they normally would. Low transmission fluid can also prevent your vehicle from going into/staying in certain gears. This could create a significant safety hazard, especially in certain high-speed situations, such as trying to merge or change lanes on the freeway. With low transmission fluid, you might also notice grinding during the shifting process. A visual check will give you a clear-cut sign of low transmission fluid. It’s usually best to check transmission fluid with the engine still on. This is because transmission fluid tends to contract when it cools, which can then give an inaccurate reading on how much fluid you’re actually driving with. If you see on the dipstick that the fluid level has gotten concerningly low, then you could be dealing with a transmission fluid leak, which is something that needs to be promptly addressed. Fluid that appears dark or smells burnt should also be brought to a mechanic’s attention as soon as possible. Transmission Service in Boise, ID When you need transmission service in Boise and the surrounding area, contact Red Line Transmission at  208-375-0098  . At our local transmission shop, we can expertly repair transmission fluid leaks. Feel free to give us a call today to schedule an appointment for any of your vehicle’s repair or maintenance needs !