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.

Mechanic draining oil from a vehicle transmission pan into a black catch basin in a workshop
By Red Line Transmission • November 6, 2026
At Red Line Transmission, our team strives to earn our customers’ total satisfaction by providing top-quality repairs, timely service, and fair pricing. Whether you need a transmission rebuild or just an oil change, our local mechanics will complete the job to the highest standards. And we appreciate it when our customers give us feedback. Here’s a look at some of our recent reviews. “We were traveling and needed transmission service. They got us in fast! We dropped off that afternoon and were able to pick the truck up next day. We are so thankful and appreciative! Great service and pricing! Would come again if needed!!” —Rhe’Anna F. “Alex is a great and honest mechanic, I’ve sent my car to him multiple times and have never left without a smile on my face. He’s very quick even with issues that are hard to diagnose and will make sure you are informed and happy throughout the whole process. Couldn’t find better in all of Idaho.” —Isaiah “Alex does great work! He rebuilt the transmission on my 2016 Chevy 2500HD (gas engine), replaced the torque converter, radiator, and transmission cooler. He did a great job! He’s very professional, trustworthy, and knows his stuff. I have over 13,000 miles on the rebuilt transmission and have had no issues and it’s still shifting and driving great. I highly recommend Red Line Transmission.” —Tyler P. “Have a 2020 Ram Promaster cutaway with a bad squeak and moan issue that the dealership could not diagnose. Alex and his team rebuilt the transmission and replaced the CV axle and the noise went away. Redline had great customer service, excellent pricing and they are honest about the times it took to get the vehicle fixed. They were also exceptionally communicative with us during the entire process. Thank you Red Line!!” —Hans L. “Great shop! Owner was a pleasure to work with! Honest and professional and did a fantastic job! Highly recommend!” —Steve R. Transmission Repair in Boise, ID For expert transmission repair in Boise, ID and the surrounding area, contact Red Line Transmission at  208-242-4896  . We also provide top-quality general auto repair and maintenance. Feel free to give us a call to schedule an appointment!
By Red Line Transmission • October 5, 2026
While normal wear is unavoidable, many serious engine problems can be avoided by following a consistent maintenance routine and responding to warning signs promptly. Taking care of your engine can support dependable performance, improve efficiency, and help prevent minor issues from developing into more extensive mechanical problems. At Red Line Transmission, our local mechanics are highly experienced with engine repair and maintenance in the greater Boise, ID area. Here are four easy ways to help keep your engine in excellent long-term condition. Follow a Consistent Oil Change Schedule Regular oil changes are essential for maintaining engine health. Engine oil lubricates moving components, helps reduce friction, and carries away heat and contaminants. Over time, oil becomes dirty and can lose some of its effectiveness. Following the manufacturer’s recommended oil change schedule helps ensure the engine has clean, properly formulated oil available for lubrication and protection. Keep the Cooling System Maintained The cooling system helps regulate engine temperature and prevent overheating. Coolant, the radiator, water pump, thermostat, hoses, and other components all contribute to proper temperature control. Check coolant levels when appropriate (and make sure the engine is cool when doing so) and have the cooling system inspected if you notice leaks, temperature changes, or other warning signs. Addressing cooling system problems early can help protect the engine from excessive heat. Take Action if You Notice Warning Signs Unusual noises, poor acceleration, rough idling, excessive exhaust smoke, fluid leaks, and dashboard warning lights can indicate an engine-related problem. Ignoring these symptoms may allow a relatively manageable issue to become more serious. Whenever your vehicle begins behaving differently, have the problem diagnosed by a technician. Prompt attention can help identify problems before additional engine components are affected. Schedule Professional Engine Inspections Routine professional inspections provide another important layer of protection for your engine. An experienced technician can check for leaks, worn components, fluid problems, cooling system concerns, and other developing issues that may not be obvious during everyday driving. Professional maintenance can also help ensure that recommended services are performed at appropriate intervals. Engine Repair and Maintenance in Boise For an experienced mechanic in Boise and the surrounding area, contact Red Line Transmission at  208-242-4896  . At our nearby auto shop, we can expertly address your vehicle’s repair and maintenance needs. Feel free to give us a call to schedule an appointment!
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!