Used Limited Slip Unit
Request a VIN-matched quote for a used Limited Slip Unit. Availability, condition, warranty, and shipping are confirmed for your exact vehicle before purchase.
- ✔ Used-part options
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Part Details
Your quote request is reviewed against your vehicle details. Before buying, ask for the condition description, mileage when relevant, warranty terms, shipping cost, and final price so you can compare the available options.
Quote status: Live stock and public prices are not displayed. Request a vehicle-specific quote to review the available option and its final terms.
Compatibility: Multiple makes & models
Condition & Quality Standards
Condition grading and inspection practices vary by part and source. Before purchase, request the available condition description, mileage information when relevant, photos, and any inspection or test notes.
About This Limited Slip Unit
A limited-slip unit keeps torque going to the wheel that still has grip, and before shopping one you need to know which of three mechanisms your axle uses, because they behave and wear differently. A clutch-type - the classic posi - stacks friction discs against a preload spring, so it is a wear item, and every clutch-style unit needs friction modifier in the gear oil or the clutches grab and release instead of slipping smoothly. That is the chatter you hear in tight turns. A helical or gear-type unit biases torque through gear geometry instead of clutches, so there is no clutch pack to wear and no additive to worry about, but it works to a torque bias ratio: with one wheel on ice or in the air there is little traction for the gear set to multiply against. An electronically controlled unit puts a wet clutch pack behind an actuator and a control module, so it can run anywhere from open to locked - and used, it is an electrical part as much as a mechanical one.
Want the full picture before you buy? Read our limited slip and locking differential guide.
Before you order, it helps to read:
Common Signs Your Limited Slip Unit May Need Replacing
- One wheel spinning on a wet or loose surface while the other sits still, like an open differential
- Chatter or shudder through slow, full-lock turns, often first noticed after a fluid change
- A bang or clunk as traction hands across from one side to the other
- A traction or differential warning on an electronic unit
- Friction material or bright metal on the cover magnet, or noise that changes as you lift off
Symptoms vary by vehicle and driving conditions. Always confirm diagnosis before replacement.
What to Check When Buying a Used Limited Slip Unit
- Establish which mechanism you are replacing - clutch-plate, helical gear-type or electronic - they are not substitutes
- Match the gear ratio and check it sits inside the band that carrier is built for
- On four-wheel or all-wheel drive, match the front axle ratio exactly as well
- Match the side-gear spline count to your axle shafts
- Confirm the ring-gear bolt pattern and count, and whether a ring gear comes on the unit
- On a clutch-type, ask about clutch-pack condition and preload, and plan gear oil with friction modifier
- On an electronic unit, confirm the actuator, wiring and connector are included and that your vehicle module is set up to run it
- Have a differential shop fit and set it up - bearing preload, backlash and contact pattern all have to be set
Ask for these details and any available photos before approving a purchase.
What Happens After You Request a Quote
- We review your vehicle and part request
- Provide your VIN or full vehicle details for fitment review
- Review the available condition, warranty, shipping, and price details
- You decide — no obligation to buy
Response time depends on the part, vehicle information supplied, and current sourcing options.
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Availability & Quote Details
- Live stock and public pricing are not displayed for this Limited Slip Unit
- Available condition, fitment, warranty, shipping, and final pricing are confirmed only after we review your request
- Ask for warranty and return terms in writing before you buy
- Shipping options are confirmed for the destination and part size
Check Current Availability
We do not display unverified stock records. Send your VIN or year, make, model, and original part number so a specialist can confirm exact fitment and the options currently available.
How Pricing Is Determined
Pricing for used limited slip unit depends on several factors:
- Vehicle year, make, model, and engine configuration
- Mileage and overall condition of the donor vehicle
- Supplier location and shipping distance
- Warranty coverage offered
We quote rather than list prices. Mechanism sets the band first: clutch-plate, gear-type and electronically actuated units are three different parts with three different pools behind them, and the electronic one carries its actuator. After that it is the usual axle detail - ratio, spline count, ring-gear bolt pattern - and whether you want a bare unit or one loaded with a ring gear. Send the VIN and axle tag and we will confirm the type before quoting.
Confirm the final price and fitment basis before approving a purchase.
Frequently Asked Questions
How do I tell which type of limited slip I have?
By what is inside. A clutch-type is a stack of friction discs against a preload spring. A gear-type biases torque through helical gear geometry with no clutch pack. An electronic unit adds an actuator and wiring and takes orders from a module. The build sheet, option code or axle tag usually says, and a shop can confirm with the cover off.
Does a limited slip need a special additive?
Clutch-style units do: friction modifier goes into the gear oil at install, and without it the clutches stick and release rather than slipping cleanly, which is what produces chatter in tight turns. Gear-type units do not depend on it. If yours chatters in slow corners, the additive is the first check.
Can I fit a limited slip where I have an open differential?
Usually yes, if the unit is built for your axle, your ratio falls inside its carrier band, the side gears match your axle spline count and the ring-gear bolt pattern lines up. It is not a bolt-in swap though: the ring gear moves across and the assembly is set up again, which is shop work.
My limited slip still spins one wheel - is it worn out?
On a clutch-type, probably: the discs wear and the unit slowly behaves like an open differential. On a gear-type, not necessarily - it works to a torque bias ratio, so with one wheel lifted or on ice there is almost no traction on that side to multiply against, and it can look broken while being healthy.
How is a limited slip different from a locking differential?
They are different parts. A limited slip lets the two wheels turn at different speeds while biasing torque to the one with grip. A locker drives both wheels as one, automatically or on a switch, and either unlocks or scrubs the inside tire in tight turns on dry pavement. Ordering by the word posi is where this goes wrong: on GM trucks the G80 option is an automatic locker, not a posi.
The used posi came out of a 200,000-mile truck - what actually wears out in one?
The friction surfaces, not the preload spring. Auburn Gear says its limited-slip springs will not weaken, because they are not subject to the cyclic compression and expansion that causes load loss; what falls away is clutch capacity, reduced by wear or by damage from misuse. So on a high-mileage unit, ask about the clutch surfaces and the preload, not the age of the spring.
Do both rear tires have to match to run a limited slip differential?
Closely enough that it is worth measuring. Auburn Gear tells owners to keep the rolling radius of the two tires, at pressure, within a quarter of an inch on-road and half an inch off-road, and notes that mismatched pressures alone mean different tire diameters and different wheel speeds. Outside that the two sides never turn at the same speed, so the unit is working even in a straight line.
Does a used limited slip unit come with its carrier bearings?
Do not assume so - ask, and budget for them as a separate line. Carrier bearings are pressed onto the carrier and secured with green Loctite, so they belong to the unit they came off and a press is needed either way. Stock-size bearings suit most axles, with the Ford 8 inch, some Ford 9 inch housings and the Dana 35 the exceptions. Confirm what your axle takes.
How is compatibility verified?
Provide your VIN or full vehicle details so you can review the fitment basis in your quote before approving a purchase.
What if the part does not fit?
Most suppliers offer limited return or exchange options. Warranty and return terms are confirmed before purchase.
How long does shipping take?
Shipping time varies by location, part size, and freight arrangement. Confirm the dispatch and delivery estimate in your quote.
