Updated at: 20-03-2022 - By: micdot

This article contains affiliate links. A little commission will be paid to me if you purchase something through one of the links. To keep a car running smoothly, a transmission flush is essential. How long does it take to flush a transmission? Transmission flushing might take anywhere from an hour to three hours, depending on the type and model of the vehicle.

It’s also worth noting that there are a variety of transmission flushes, and the length of each depends on the sort of flush you’re opting for. We’ll look at how long a transmission flush takes on average, why it’s necessary, how much it costs, and when you should flush your gearbox in today’s post.

What Is Transmission Flushing?

Transmission flushing is the process of cleaning out a vehicle’s transmission of old fluid, dirt, and other pollutants. It is recommended that transmission flushes be performed every 15,000 miles or more, depending on the type of driving you undertake (e.g., stop and go traffic).

Consider consulting with a transmission expert to get more precise information about your vehicle’s transmission system.

Why Is Transmission Flush Important?

Transmission flushing is essential because it keeps the transmission from becoming blocked or otherwise malfunctioning. In the absence of a flush, there is no way to verify the cleanliness of your vehicle before taking it to a mechanic.

How Long Does A Transmission Flush Take?

Fluid type, vehicle make/model, and system cleanliness all factor into how long it takes to perform a transmission flush. However, on average, the flushing procedure takes between one and three hours. Depending on where you travel and what kind of vehicle you have, the entire process can take as little as two hours on average.

Flushing an automatic transmission in factory original equipment, for example, should take less time than flushing a manual transmission. When it comes to manual transmission vehicles, there are more fluids that need to be drained and refilled with new fluid, which can lead to a service time increase of more than two hours.

How Do You Know If Your Transmission Needs A Flush?

When it’s time for a fluid change or flush, there are a number of indicators:


The bottom of the tank is clogged with sludge.

When shifting gears, the vehicle jerks or hesitates.

When shifting is noisy or jerky, that’s a sign that the transmission needs to be flushed.

Have the transmission flushed by a mechanic if you’re unsure if it has to be done.

How Often Should You Flush Your Transmission?

Ideally, transmission fluid should be drained and replenished once every 30,000 miles. When driving in harsh conditions, flushing the transmission for long periods of time is particularly critical (i.e., when you experience high RPMs or your vehicle spends a lot of time in stop and go traffic).

Will A Transmission Flushing Hurt My Car?

Transmission fluid flushes come in two flavors, none of which will harm your vehicle. An exterior or partial (non-drain) installation can be completed in as little as 30 minutes. Depending on the gearbox system’s intricacy, a full drain can take up to three hours. The drain plug is removed and a funnel for collecting used transmission fluid is installed as part of an external flush.

It is necessary to drain, clean, refill, and flush the car’s transmission system from top to bottom before reinstalling everything. A three-hour time frame is possible.

Other FAQs About Transmission Flush

How long does a transmission flush take at jiffy lube?

A full gearbox flush at Jiffy Lube will take anything from 30 minutes to an hour.

How Much Does A Transmission Flush Cost?

When it comes to a transmission flush, the price ranges between $30 and as high as $750.

How long does a transmission flush take at Valvoline?

Transmission flushing at Valvoline typically takes 30 minutes or less.

What Is The Difference Between Transmission Fluid Change And Flush?

Transmission fluid changes are distinct from transmission fluid flushes in that just the old, unclean oil is swapped out for the new, clean one. However, flushing the transmission may be necessary if there are a lot of impurities in the system. When it comes to transmission flushes, it’s less frequent than an oil change because it removes all of the sediments and garbage that have built up over time.


To keep an automobile operating smoothly, a transmission flush is essential. How long does it take to flush the transmission?

For most mechanics, this technique can be completed within three hours of starting the procedure.