Automatic Transmission Assembly for 2003-2004 Toyota 4Runner
Product Notes Read before buying
Voice or type your vehicle details and Wrenchy will confirm fitment in seconds.
Vehicle Fitment Guide
This part fits the following vehicles:
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| Limited | SUV | 2003 - 2004 | V6 4.0L | - |
| Sport | SUV | 2003 - 2004 | V6 4.0L | - |
| SR5 | SUV | 2003 - 2004 | V6 4.0L | - |
Know This Transmission Before You Buy
The research behind our purchase interview — recalls, bulletins and real install economics for this transmission family:
A quick look at your own vehicle makes sure the right transmission shows up:
- Verify the 'A/TM' code on the driver's side door jamb sticker ends in A340F.
- Confirm the vehicle has the 4.0L V6 engine (not the 4.7L V8).
- Confirm the vehicle is a 4x4 (4WD) model.
- Verify the presence of a physical transmission dipstick on the passenger side of the engine bay.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Heavy-duty transmission jack with safety straps
- Extra-long socket extensions (30 inches or longer) with swivel joints
- Torque wrench
- OBD2 scan tool with live transmission fluid temperature data
Budget for these consumables at install:
- Toyota Genuine ATF Type T-IV (11 to 13 quarts for dry fill)
- Transmission filter and pan gasket (or Toyota FIPG sealant)
- Front pump / torque converter seal
- Rear output seal (mating seal to transfer case)
- Aerosol transmission cooler line flush
What your vehicle’s computers will need after the swap:
What’s involved: none
The transmission is a direct plug-and-play swap with no VIN-locked module. Disconnecting the battery for 30 minutes or using a scan tool to clear the ECU's adaptive memory is recommended to allow the computer to relearn shift points.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque converter must be fully seated (three distinct clicks/drops, recessed by at least 0.8 inches) before bolting to the engine to prevent crushing the front pump gear.
- Ensure exactly two metal alignment dowel pins are present on the engine block; check that they did not stick to the old bellhousing or double-up.
- Inspect the engine flexplate for hairline cracks radiating from the crankshaft mounting holes.
- The transfer case must be swapped over; replace the mating seal between the transmission and transfer case during the swap.
- If the previous unit failed due to coolant contamination, the radiator must be replaced and lines flushed to prevent immediate failure of the new unit.
Easy to get right once you know them:
- Using the wrong fluid: putting Toyota WS or Dexron III fluid instead of the required Toyota Type T-IV.
- Reusing a contaminated radiator/cooler without flushing or replacing it.
- Damaging the 4WD actuator and position sensors on the transfer case adapter during the swap.
- Reusing the flattened dipstick tube O-ring, leading to fluid leaks.
- Ordering for a 4.7L V8 engine or a 2WD vehicle (which use different transmissions).
Not issues with the units on this page — the manufacturer documented these for every transmission of this family, wherever you buy one. Handy for your installer:
🔎 Recommended at install: Install updated B3 brake piston seals and return springs during rebuild.
🔎 Recommended at install: Replace solenoids; if codes return, replace the worn-out valve body casting.
🔎 Recommended at install: Replace the radiator and thoroughly flush the cooler lines, or install an external standalone transmission cooler.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-61803-2225082). Unit-specific details — mileage, condition, warranty, freight — are covered in the checkout interview.
Policies, in plain English.
Shipping & Handling
- Ships by LTL freight on a pallet — a real freight truck, not a parcel van
- Your checkout freight quote covers delivery to your door (liftgate service included for residential addresses)
- The carrier calls ahead to schedule a delivery window — someone must be present to receive it
- Typically palletized and picked up within 2–3 business days; transit time depends on distance
120-Day Warranty
This part includes a 120-day warranty.
- If the part fails within the warranty window, we'll replace it or refund per the coverage terms
- Coverage is parts-only — installation labor is not included
- Warranty covers defects — not installation errors, misuse, or damage after installation
Your pre-purchase interview reviews these exact terms with you before anything is charged.
Returns (30 Days)
We accept returns of uninstalled parts within 30 days of delivery for this part.
- Defective parts: We will replace the part or issue a refund at our discretion
- Programming: "Needs to be programmed to my vehicle" is not a valid return reason. Many modules require dealer programming — we're happy to help connect you with resources if your dealer says it's not programmable
- Return shipping: This part ships by freight (LTL) — the part price is refundable per the terms above, but shipping costs are non-refundable and return freight follows the seller's return terms. Your pre-purchase interview walks through the exact numbers before you buy
- Parts must be returned in original packaging and unmodified condition
- Poorly packaged returns that arrive damaged will not be credited
Damaged in Shipping?
Freight damage is rare — and you're fully protected when you do two things at delivery:
- Inspect before you sign — you're allowed time to look the pallet over while the driver waits
- Write any damage on the delivery receipt before signing — that one line is what makes a freight claim succeed
- Severe damage? Refuse the delivery — it goes back at no cost to you and we make it right
- Photograph the pallet before unwrapping; report concealed damage within 24 hours of delivery
We handle the carrier claim — you just help document it. Your pre-purchase interview walks through this checklist too.
Order Cancellation
Cancel before shipment for a full refund. Once the pallet has been built, a preparation charge may apply — and once the freight carrier picks it up, shipping costs are non-refundable and standard return terms apply. Your pre-purchase interview shows the exact numbers before you pay.
Expert Guides
2003-2004 Toyota 4Runner 4.0L V6 Transmission: Problems, Identification, and Used Replacement
Identify whether your 4Runner has the A340F or A750F, learn what causes solenoid fatigue and torque converter shudder, and know when it is time to swap in a used OEM assembly.
Read Full Guide →Related Trouble Codes (OBD-II)
8 matching guidesIf your scan tool is showing one of these trouble codes, this part is a common fix. Each guide explains the code, how to diagnose it, and exactly what to replace.
Miscellaneous Information
OEM Part Numbers:
Aisin: A340F
Toyota: 3200060230, 350006A110, 350106A11084
Fits Years: 2003 2004
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Backed By The Selling Yard
This unit ships with the selling yard's 120-day warranty. Longer plans can be requested during checkout.
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