A340E Overhaul Kit 1999-2009

If you are tearing down the four-speed automatic in a 2000s Tacoma, Tundra, 4Runner or Sequoia, this is the gasket and seal set for the later version of the A340 family. It is a Precision International kit, part number 97002J, and the bag is labeled 1999-09 for the A340E, A340F and A343F. People usually land on it for one of three reasons: ATF leaking at the front pump or tailshaft, a truck that sits for a second before it engages Drive or Reverse on a cold morning, or a unit that is already on the bench for clutches and needs every seal renewed while it is open.

What the overhaul kit does in a late A340E

The A340E and its four-wheel-drive cousins (the A340F with a bolted-on transfer case and the heavier A343F behind the V8s) are hydraulically applied: line pressure from the front pump is routed by the valve body to clutch and brake pistons, and the rotating shafts use sealing rings to carry that pressure into spinning drums. This kit supplies the parts that keep each of those circuits sealed: paper and rubber gaskets, O-rings, lip seals, metal-clad seals such as the pump and rear seals, and the sealing rings. It does not include friction plates, steels, a filter or a pump bushing, so plan for those separately if the unit needs them. On trucks from 1999 on, the case and valve body details changed from the 1985-2000 design, which is why the earlier and later kits are not interchangeable across every year.

Symptoms this kit is meant to fix

• Red fluid on the ground under the bellhousing, or wet at the tailshaft or transfer case adapter
• Delayed engagement into Drive or Reverse that gets better once the fluid warms up
• Soft or slipping 2-3 and 3-4 shifts as worn piston seals and sealing rings bleed off apply pressure
• A unit already apart for worn clutches, a band or a pump, where reusing 20-year-old rubber would be false economy

Not every A340 problem is a seal problem. These units are known for shift and lock-up solenoid faults too, and on OBD-II trucks a stored code such as P0750, P0755 or P0770 points to a solenoid circuit, not a leaking piston. Check codes before you pull the transmission.

How to confirm before you buy

Start with the fluid: level, color and smell. Dark fluid with a burnt odor and friction material in the pan means the frictions are gone and you need more than seals, so look at a kit that adds clutches, such as the A340E master rebuild kit with frictions and steels. Clean the outside of the case and find where the leak really starts; a front pump seal leak shows at the bottom of the bellhousing, while a pan or tailshaft leak is easy to fix in the truck. Our rebuild versus replacement cost guide helps decide whether a reseal is worth it, and the gasket and seal materials guide explains why old rubber goes hard and stops sealing.

Fitment

This listing is the 1999-2009 kit for A340E, A340F and A343F transmissions. Precision's later A340 overhaul kit is catalogued by build date rather than model year: Tundra from February 1999, Land Cruiser and LX470 from 1999, 4Runner and Tacoma from August 2000, and Sequoia from September 2000. That means a 1999 or early 2000 4Runner or Tacoma can still take the earlier design, which is covered by our A340E overhaul kit 1985-2000. Check the build date on the driver door jamb, match the transmission code on the case tag, or send us your year and VIN and we will confirm before it ships. For a V8 truck with the A343F, the A343F overhaul kit 1999-2009 is also listed, and every A340 family part we carry is on the Aisin transmission parts page.

Install notes

• Soak lip seals and rubber seals in clean ATF before assembly, and use assembly gel on the sealing rings so they stay centered as the drums slide on.
• Air-check each clutch and brake piston after assembly; a hiss means a rolled or cut seal, and it is far easier to fix before the case is closed.
• Inspect the front pump gears, body and bushing. A scored pump keeps line pressure low no matter how good the seals are, and a new A340E pump is cheaper than a second teardown.
• Since the filter is not in this kit, the A340E shift and TCC solenoid kit with filter and gasket covers the filter and the solenoids that commonly fail on these trucks.
• Refill with the ATF type printed in your owner's manual or on the dipstick for your year (Dexron-type ATF on earlier trucks, Toyota Type T-IV on later ones), check the level hot, and road test before the final top-off.

Will this kit fit my 2000 4Runner?

It depends on the build date. The later A340 overhaul kit is catalogued for 4Runners built from August 2000 on. A 4Runner built before that uses the earlier 1985-2000 kit. Check the build month on the door jamb or send us the VIN.

Does the overhaul kit include clutches, a filter or a band?

No. It is the gasket and seal set: gaskets, O-rings, lip seals, metal-clad seals and sealing rings. Frictions, steels, the filter and the pump bushing are separate parts.

Will new seals fix a delayed engagement?

If the delay comes from worn piston seals or sealing rings bleeding off pressure, yes. If the frictions are burnt or the pump is worn, seals alone will not fix it. Check the fluid condition and run a line pressure test first.

Is the same kit used for the A340F and A343F?

The package lists the A340E, A340F and A343F for 1999-09. The 4WD units add transfer case adapter seals and the A343F is the heavier V8 version, so match the code on your transmission tag before ordering.

What fluid should I use after the rebuild?

Use the ATF your owner's manual or dipstick calls for. Earlier A340 trucks specify Dexron-type ATF and later ones specify Toyota Type T-IV. Check the level with the engine running and the fluid at operating temperature.

• Transmission Rebuild vs Replacement Cost
• Transmission Gasket and Seal Materials: What Fails and Why
• Toyota Camry and Tacoma Transmission Service
• Complete ATF Fluid Types Guide