Shop Diagnostic Tools →
Slipping means the engine revs but the power does not fully reach the wheels. The clutches inside are not holding. But why they are not holding spans a huge cost range, and that is what makes this a frustrating question to get a straight answer to. Walk into a shop saying "it slips" and the cheap answer might be a fluid change, while the expensive answer is a rebuild. A good shop diagnoses before quoting; a bad one quotes the rebuild first.
This page prices out each cause from cheapest to most expensive, so you can match your symptoms to a realistic number before anyone hands you an estimate. If your fluid is part of the picture, start with our companion guide on symptoms of low transmission fluid, because that is the cheapest cause and the easiest to rule out.
Cost by Cause, Cheapest First
| Cause of Slipping | The Fix | Cost (parts + labor) |
|---|---|---|
| Low fluid | Top off, find & fix leak | $120 - $400 |
| Old / burnt fluid | Fluid & filter service | $150 - $350 |
| Failed shift solenoid | Solenoid replacement | $250 - $700 |
| Valve body wear / stuck bore | Valve body repair or replace | $500 - $1,500 |
| Bad torque converter | Converter replacement | $700 - $1,500 |
| Worn clutch packs / bands | Rebuild | $2,000 - $4,000 |
| Catastrophic internal failure | Rebuild or replace | $2,500 - $5,500+ |
Walking Through Each Cause
Low or burnt fluid: $120 to $400
The first and cheapest thing to rule out. Low fluid drops line pressure and the clutches slip; burnt fluid has lost the friction modifiers the clutches need to grab. A level check is free and a fluid-and-filter service is the cheapest real repair there is. If clean fresh fluid at the correct level stops the slip, you got lucky. See how to diagnose slipping and the fluid color chart. Note: fluid that is brown and burnt smelling often means the clutches are already worn, in which case a flush can briefly buy time but the rebuild is coming.
Failed shift solenoid: $250 to $700
A solenoid that sticks or fails to apply pressure causes a specific gear to slip or the unit to flare between gears. This usually sets a code, which is the good news: it points you straight to the part. On many vehicles the solenoid is accessible by dropping the pan, which keeps labor down. On units where the solenoid is buried in the valve body or you have to remove the transmission, it climbs. Read solenoid replacement cost by vehicle and how to test a solenoid.
Valve body issues: $500 to $1,500
The valve body routes pressure to the clutches. Worn bores leak pressure internally, and the result is slipping or harsh shifts that come and go. A Sonnax bore repair or a replacement valve body fixes it without a full teardown. See valve body replacement cost.
Bad torque converter: $700 to $1,500
A converter with a failed lockup clutch slips at highway speed and often triggers a shudder. The converter itself is not expensive, but it sits behind the transmission, so the labor to pull the unit is most of the bill. See bad converter symptoms and cost and converter replacement cost.
Worn clutches and bands: $2,000 to $4,000
This is the real rebuild. When the friction material on the clutch packs is worn down to nothing, no amount of fluid or pressure brings the grab back. The unit comes out, comes apart, and gets new frictions, steels, seals, and usually a converter. If the fluid was run low or hot for a long time, this is where the slip usually ends up. Our 2026 rebuild cost guide breaks it down, and how long a rebuild takes covers the timeline.
Diagnose Before You Spend
The cheapest money you can spend is on the diagnosis, because it stops you from paying for a rebuild when a $300 solenoid would have fixed it. Before you commit:
- Check the fluid level and color. Free, and it rules out the cheapest cause. Our dipstick guide shows how.
- Pull the codes. A slip with a stored solenoid or ratio code points you to a part, not a rebuild. A basic OBD2 scanner pays for itself the first time it saves you a needless rebuild quote.
- Note when it slips. Cold only, one specific gear, or at highway lockup all point at different and cheaper causes than a unit that slips in every gear all the time. See slips when cold and slipping with no codes.
- Get a second opinion before authorizing a rebuild. A rebuild is the most expensive answer, so make sure it is the right one.
Is It Even Worth Fixing?
If the diagnosis lands on a rebuild, the next question is whether the vehicle is worth it. The rule of thumb: if the rebuild costs less than a year of payments on a comparable replacement and the rest of the vehicle is sound, fixing it usually wins. We work through that math in is it worth rebuilding a high-mileage transmission and rebuild vs replace cost comparison.
Rebuild on the Table? Get Parts Same-Day
If the slip traces back to worn clutches, you need quality frictions, steels, seals, and often a converter to do it right. gearboxinsider.com stocks complete rebuild kits and individual hard parts, shipping same-day before 2pm Eastern with free shipping on every order, so the only wait is your bench time.
Shop Gearbox Insider →FAQ
Is it cheaper to fix slipping or replace the transmission?
If the slip is from low fluid, a solenoid, or a valve body, fixing it is far cheaper than replacement. If the clutches are worn out, a rebuild and a replacement cost in the same neighborhood, and which is cheaper depends on whether a good reman unit is available for your vehicle.
Can I drive a slipping transmission?
You can, but every mile of slipping wears the clutches further and adds heat, which can turn a cheap fix into a rebuild. Diagnose it quickly rather than driving on it.
Will a fluid change fix slipping?
Sometimes, if the cause is low or degraded fluid and the clutches are not yet worn out. If the frictions are already worn, fresh fluid will not bring the grab back. It is still the right first step because it is cheap and it rules a cause in or out.
Does an additive fix a slipping transmission?
An additive can temporarily reduce slipping caused by hardened seals, but it does not restore worn clutches. See whether stop-slip additive works for the honest take.