Every transmission we ship is backed in writing.
A used transmission is a major decision, so we keep the promise simple: 180-day parts coverage included free, extend it to 1 or 3 years at checkout, and you see HD photos of your exact unit and approve them before it ever leaves our facility.
How long is the warranty?
Standard coverage is included with every transmission and depends on the model year — newer units carry longer terms because their components have aged less. Extend it at checkout for up to 3 years.
Free with every transmission
On 2000-and-newer model years — at no extra cost.
- 90 days for 1991–1999 model years
- 30 days for 1990 and older
- Parts-only coverage of the internal components
- The term printed on your invoice controls
Extended parts warranty
Twice the standard term — add it at checkout or by phone before shipping.
- Same internal-parts coverage, longer
- Same specialist claim process
- Keep routine service records on file
- Ideal for daily drivers
Ultimate parts warranty
The longest coverage we offer on any transmission.
- Six times the standard term
- Ideal for work trucks and high-mileage use
- Keep fluid-service records per the manufacturer's schedule
- Same claim process, same specialist team
Your coverage, start to finish
6 stops · order to claimYou see it before it ships.
Every order follows a strict 6-step fulfilment process. Nothing leaves our facility until you've seen HD photos of your exact transmission and approved them in writing.
Payment authorization
Your order is confirmed, logged and matched to your VIN.
Final quality inspection
Shift testing through every gear and fluid checks on your exact unit.
Dismantling & cleaning
Professionally removed, cleaned and prepped for freight.
HD photos shared with you
Sent by text or email for your review — case, pan, converter, tag.
Your written approval
Your go-ahead is recorded before dispatch. No approval, no shipment.
Palletizing & freight dispatch
Strapped, wrapped and shipped — typically 3–5 business days in transit.
100% refund if you reject the photos
If you review the pre-shipment photos and reject the unit before freight dispatch, you receive a 100% full refund — zero cancellation or restocking fees. Your written photo approval is what releases your order for shipping.
Cancellations after approval or in transit
Once you've given written photo approval and the carrier has dispatched your shipment, the actual outbound and return freight is non-refundable and is deducted from any refund.
Five things you're entitled to.
What the warranty gives you, broken into five operating principles — and the short checklist that keeps it valid.
30-day installation window
Install within 30 days of the invoice date to keep your return and warranty valid. A unit that sits collects moisture — seals dry out and rust starts.
180 days to 3 years of protection
After the 30-day return window closes, your transmission is still covered for the full term on your invoice.
Full freight on approved claims
We pay the shipping if your return is approved under warranty — pickup and the replacement's delivery.
VIN-matched compatibility
We match by your VIN. Even if the unit comes from a different year or model, it fits and works like the original.
Replacements & refunds
Approved claim → we collect the unit and ship a tested replacement of equal grade. No compatible unit within 10 business days? Refund.
Follow the checklist to keep your warranty valid.
Installation must be performed by a certified professional, following every step below. Most transmission failures after install come from fluid problems, not the unit — the checklist exists to protect you.
Download pre-installation checklistWhat's covered, and what isn't.
Five clauses every buyer should read before signing for delivery. Each one starts with the short version — the detail sits underneath.
Order cancellations
After 24 hours we begin preparing your transmission for shipment. If you cancel after that for any other reason, the following applies:
- 25% restocking fee
- Round-trip freight (actual cost, both directions), if the unit has already shipped
30-day return window
Every return needs a written Return Authorization (RMA) from us before it ships back — returns without one can't be accepted at our dock. We can't take returns after 30 days from the date of purchase.
Please note: sending back a transmission that arrived in good shape (changed your mind, ordered the wrong part, no fault found) counts as a cancelled order — the 25% restocking fee applies and round-trip freight is your responsibility.
Inspect before you sign the BOL
The driver must wait while you or your mechanic check for case cracks, broken ears, a damaged pan or bent components.
- If anything is damaged, write "RECEIVED DAMAGED — [describe it]" on the BOL before signing.
- Send us photos of the damage and the noted BOL within 48 hours of delivery.
- Concealed transit damage found after the driver leaves must also be reported within 48 hours, with photos of the unit and the packaging.
Freight carriers reject physical-damage claims on a clean signed BOL. A case cracked or damaged after delivery is not covered under warranty.
Clause D · Fluid & installation discipline
To preserve coverage, your certified installer must:
- Completely flush the cooler and cooler lines before installation.
- Install a new transmission filter and pan gasket (where applicable).
- Fill with brand-new, manufacturer-specified fluid to the correct level.
- Check and clear all ECU / TCU fault codes before the test drive.
- Keep receipts for the fluid, filter and gasket — required for any claim.
Approved returns come back within 30 days of the fault
A used transmission that sits for months after a fault can't be assessed, can't be reconditioned and can't be put back into service by anyone. That's why this is a firm condition rather than a preference.
You can't return a unit until we've authorised it and sent you the Bill of Lading, so any period before that — and any delay of ours after it — is excluded from the 30 days. We tell you in writing where the count stands.
We arrange the pickup and cover the freight. Print two copies of the BOL and keep them with the unit — the driver takes a paper copy by hand, can't accept a phone screen, and won't wait. A failed pickup caused by a missing printout is charged back.
Keep the unit dry, covered and off the ground with the fluid and ports sealed — it protects the unit and your claim. Need it moved or handled differently? Tell us and we'll arrange it at our cost.
What's in the crate?
Every used transmission ships as a core unit plus bolt-on accessories — packaged and sent together. Only one of the two is under warranty.
Core Unit
- 01Transmission case & housing
- 02Valve body & hydraulic components
- 03Torque converter (supplied with automatic units)
- 04Planetary gear sets & clutch packs
- 05Internal pumps & shafts
- 06Key internal moving parts
Free Bolt-on Accessories
- 01External sensors
- 02Solenoids
- 03Wiring harnesses & connectors
- 04Shift linkages & cables
- 05Oil pan
- 06Shift levers
- 07Mounting brackets & mounts
- 08Cooler line fittings
- 09Pan gasket & external seals
- 10Speed sensors
- 11Dipstick / fill tube (where fitted)
- 12Bolts, studs & hardware, etc.
What's covered, and what isn't.
A direct, side-by-side ledger of what falls inside the warranty boundary — and what stays outside it. Everything not listed as covered is, by definition, not covered.
What's covered?
Our warranty covers the essential internal components only:
- 01Transmission case & internal housing
- 02Valve body & hydraulic components
- 03Torque converter — when supplied with automatic units
- 04Planetary gears & gear sets
- 05Clutch packs
- 06Internal pumps, shafts & key internal moving parts
Coverage applies to verified internal mechanical failure of these components within your warranty term, confirmed by a certified mechanic's diagnostic report with fault codes.
What's not covered?
- 01External accessories — sensors, solenoids, wiring harnesses, shift linkages, coolers and cooler lines, mounts, brackets, oil pan, shift levers — included for convenience, not covered.
- 02Labor — coverage is parts-only unless a labor plan was approved in writing or purchased separately.
- 03Damage from low fluid, contaminated fluid or the wrong fluid spec, or from skipping the cooler flush, filter or pan gasket.
- 04Misuse or abuse — racing, off-road use, towing beyond the factory rating, neglect, improper handling, incorrect installation or unauthorized repairs and modifications.
- 05A case cracked or physically damaged after delivery, and torque-converter failure from improper seating or installation torque.
- 06Pre-existing vehicle problems that damage the ordered part — these also void the warranty.
- 07Consequential costs — delays, loss of time, towing, rental, storage, diagnostics or downtime caused by a defect.
- 08Leaks from old gaskets, filters or seals; and electrical faults in sensors, solenoids or modules.
- 09Mileage discrepancies — mileage is provided to the best of our knowledge; the sale and warranty rest on the unit's tested condition, not an exact reading.
Eight things that voidsyour warranty.
If any of the following occurs, protection is forfeited. Read carefully — this is the part that costs people coverage.
Skipping the pre-installation checklist
Or no verified installation record from a certified installer.
Overheating or low-fluid damage
Including missing, damaged or tampered heat tabs where fitted.
Wrong fluid spec, low level or contaminated fluid
Verifiable on teardown — automatic void.
No new filter & pan gasket, or no cooler-line flush
The installation prerequisites are mandatory, not optional.
Repairs, modifications or disassembly not authorized by us
Opening the unit before our inspection ends the claim.
Improper storage before installation
Rust, corrosion or exposure damage — or not installed within 30 days.
Not returning a faulty unit within 30 days of the fault
See Clause E — time waiting on us is excluded.
Returning without an RMA, in a different condition, or with missing parts
Every return needs a written Return Authorization first.
Ready to file a transmission claim?
Four steps, four documents. Have these ready and a specialist can move your claim the same day.
Contact us
Reach your specialist by phone, text or email with your order number and stock number in hand.
Submit documents
Send the four items below so we can verify the fault and your installation.
Specialist review
A real person reviews your claim — no queue, no bots — and confirms the decision in writing.
Replace or refund
Approved claims ship a shift-tested replacement at our cost. Same fault twice? Full refund.
What to have ready
4 documentsVideo of the fault
A short video showing the shifting, slipping or noise fault, with our transmission's stock number visible.
Installation invoice
The invoice from your certified installer showing our pre-installation checklist was followed.
Diagnostic report
A certified mechanic's report with fault codes isolating the exact cause of failure.
Fluid, filter & flush proof
Receipts for the new fluid, filter and pan gasket, and confirmation the cooler and lines were flushed.
Talk to a real specialist
What your purchase confirms.
Clear terms, agreed in writing at checkout — so there's never a dispute about what was promised.
Your order is your agreement
By completing a purchase with American Motor Supply, you acknowledge and agree to this warranty, the return terms above and our full warranty terms & conditions. Your checkout agreement, your written pre-shipment photo approval and your signed delivery receipt form the record of the transaction.
Payment disputes over free courtesy accessories, buyer's remorse, or transit damage signed for on a clean BOL are outside the scope of this warranty; those matters are resolved under the return and claim procedures above, and disputed charges will be contested with the transaction records described here.
Your legal rights
This warranty gives you specific legal rights, and you may also have other rights that vary from state to state. It is the sole and exclusive remedy provided by American Motor Supply; to the fullest extent permitted by law, implied warranties are limited to the duration of this express warranty. Liability is limited to the repair, replacement or refund of the part purchased.
Your transmission, our promise.
A used transmission isn't a phone case. It's a major decision — and the people behind your warranty know it. Every claim is read by a real specialist, not a queue.
Full warranty terms & conditions apply · Last updated August 2026