Heavy-Duty Transmission Repair

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Heavy-Duty Transmission Repair — Complete Brake Service (preview)

Heavy-duty transmissions are some of the most expensive parts on a commercial truck — and some of the most expensive places to make a wrong call. Truck transmission repair, diesel transmission service, and clutch work require diagnostic experience and the right equipment. Complete Brake Service has been the commercial transmission shop in Columbus that owner-operators and fleets rely on since 1986. We diagnose carefully, recommend honestly, and tell you straight whether you're looking at a fluid service, a clutch job, a rebuild, or a replacement — before you spend a dollar.

Heavy-Duty Transmission Services

Diesel and gas commercial trucks. Manual, automatic, and automated manual transmissions on Class 4 through Class 8 vehicles. Allison, Eaton, and the major commercial transmission platforms.

Transmission Diagnosis

Hard shifts, slipping, missed gears, strange noises, transmission warning lamps. We test, scan, and isolate whether you're looking at a fluid issue, a sensor, an external linkage problem, or internal wear.

Repair & Rebuild

Internal repair, rebuild work, and full replacement when that's the right call. We'll show you the diagnostic findings and the cost trade-offs between repair, rebuild, and replacement before any major work.

Clutch & Drivetrain

Clutch replacement on manual commercial transmissions, throw-out bearings, pilot bearings, flywheel work, driveshaft and U-joint service. The drivetrain components that often pair with transmission work.

Fluid Service & Maintenance

Transmission fluid changes on a manufacturer-recommended schedule, filter service, transmission cooler inspection. The cheapest hour your transmission ever spends in a shop is a scheduled fluid service.

Trusted in Columbus Since 1986

580 W Town St, Columbus, OH 43215  ·  Mon–Fri 8a–6p  ·  Sat 9a–2p

When Your Truck's Transmission Needs Attention

Transmission problems usually announce themselves before they fail completely. The earlier you bring it in, the more options you have — and the smaller the bill tends to be.

Hard or rough shiftsBanging into gear, harsh engagement, or shifts that feel different than they used to — usually points to fluid, sensors, or internal wear.
Slipping under loadRPMs climb but the truck doesn't accelerate, especially under heavy load or on a grade. Slip is one of the more urgent transmission warnings.
Missed or skipped gearsThe transmission won't engage a gear, jumps gears, or hangs between shifts — usually internal or computer-related.
Strange noisesWhining, grinding, humming, or clunking from the transmission area. Each pattern points to different internal components.
Fluid leaks or low fluidRed or amber fluid spots under the truck, or a low-fluid warning. Running low destroys transmissions fast — get it diagnosed before it fails outright.
Transmission overheatingOverheating warning, temperature gauge climbing, or a smell from under the truck. Heat is the number-one killer of transmissions; address it promptly.

Get a Real Diagnosis Before a Big Repair

Careful diagnostics, fair pricing, and honest repair-or-replace guidance — before you spend a dollar.

Schedule a Service Call (614) 221-4888

Why Owner-Operators and Fleets Choose CBS for Transmission Work

Diagnose Before You Spend

Heavy-duty transmissions are expensive. A wrong call between "fluid service" and "rebuild" is a multi-thousand-dollar mistake. We test, scan, and isolate the actual cause before any major work — and we'll show you the data behind the diagnosis.

Decades of Drivetrain Experience

Since 1986, we've worked through every common heavy-duty transmission fault, every clutch wear pattern, every driveline noise. Pattern recognition is the most valuable diagnostic tool there is, and we've spent four decades earning ours.

Honest Repair-or-Replace Conversations

Sometimes a rebuild makes economic sense; sometimes a replacement is the smarter long-term call; sometimes the right answer is a fluid service and you're back on the road. We'll tell you what we'd do in your shoes — backed by the numbers.

Built for the Work

Our shop has the lot space, the bays, and the equipment for heavy-duty drivetrain work. Most general repair shops can't physically take this — pulling a Class 8 transmission requires the right lift, the right floor space, and the right experience.

Heavy-Duty Transmission Questions, Answered

The questions Columbus owner-operators and fleet managers ask us most about transmission work.

Do you work on Allison and Eaton transmissions?

Yes. We service Allison automatic transmissions (common in medium- and heavy-duty trucks, school buses, and vocational equipment), Eaton-Fuller manual transmissions (common in Class 8 tractors), automated manuals like Eaton's UltraShift and Volvo's I-Shift, and the other major commercial transmission platforms. Diagnostics, repair, and replacement on each.

Can you rebuild a heavy-duty transmission?

Yes. Rebuild work is part of what we do. Depending on the specific transmission and the scope of internal damage, we can perform the rebuild in-house or coordinate with specialty rebuild shops while doing the removal, installation, and full reinstallation work. We'll discuss the right path for your specific transmission and timeline before any decisions are locked in.

Should I rebuild or replace the transmission?

It depends on the truck, the transmission, your operating timeline, and your budget. Rebuilds preserve your existing core (often a good choice if the rest of the truck has long life left). Replacement with a remanufactured unit is often faster and comes with a warranty. New OE replacement is rarely the cost-effective choice on commercial trucks. We'll lay out the options with real numbers and recommend what we'd do in your situation.

How long does a heavy-duty transmission rebuild take?

Anywhere from a few days to a couple of weeks, depending on the transmission, parts availability, and whether the rebuild is in-house or sent out to a specialty shop. We'll give you a realistic timeline at the start so you can plan around it. For active commercial trucks, we work to minimize downtime wherever the schedule allows.

Do you do clutch replacement on commercial trucks?

Yes. Clutch replacement on manual heavy-duty transmissions is common service work — clutch disc and pressure plate, throw-out bearing, pilot bearing, and flywheel inspection or replacement. We'll inspect the related drivetrain components while we have access and quote any additional work clearly before proceeding.

How often should commercial transmission fluid be changed?

It varies widely by transmission and operating conditions. Many heavy-duty automatic transmissions call for fluid service every 50,000 to 100,000 miles in normal service, with shorter intervals for severe-service operation (heavy hauling, frequent stop-and-go, dusty conditions). Manual transmissions also need scheduled fluid service. Follow your specific manufacturer's schedule, or let us evaluate based on actual fluid condition.

My check engine light is on — could it be transmission-related?

Possibly. Modern commercial trucks have computer-controlled transmissions that can trigger fault codes for sensors, solenoids, fluid temperature, and shift control. A scan tells us whether the fault is transmission-related or coming from the engine side. Either way, the codes are a starting point — we don't replace expensive components based on guesses.

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