Frictions, steels, seals, gaskets and a piston kit to overhaul the Toyota U340E and U341E 4-speed used in the Echo, Yaris and Corolla.
Toyota's small four-speed automatic, the U340E, sits behind the 1.5L in the Echo and Yaris. Its 1.8L twin, the U341E, is in the Corolla. Both reach high mileage, and by then many slip into third or fourth, flare between shifts, or slam into drive. This master rebuild kit covers a complete teardown of either unit. It includes the friction plates, steel plates, seals and gaskets, plus a piston kit, so you are not reusing clutch pistons whose bonded rubber has hardened after years of heat.
The U340E is a compact Aisin-built front-drive transaxle with four forward gears: 2.847, 1.552, 1.000 and a 0.700 overdrive, with a 4.237 final drive. Every gear change is a handoff between clutch packs and brakes, each applied by a piston that hydraulic pressure pushes against a stack of frictions and steels. The computer runs the timing through solenoids on the valve body. When the friction material glazes or the piston lip seals go hard, the pack slips during the handoff. That is the flare you feel on the 2-3 shift. Renewing every pack while leaving the original pistons in place often brings the same complaint back. The piston kit is what sets this set apart from a friction-and-seal kit.
Pull the pan and look at the fluid and the magnet. Our ATF color and smell chart explains what dark, burnt fluid means. Burnt fluid with clutch material says the packs are gone, and this kit is the fix. Clean fluid with a harsh or erratic shift usually points to the valve body instead. Our valve body cleaning and inspection guide covers that check. Transmission Digest has also documented lockup codes on this family that come from the hydraulics, not worn clutches, so read codes and check pressure before you tear the unit down.
Listed fitment: 2000-2005 Toyota Echo 1.5L, 2006-2011 Toyota Yaris 1.5L and the 2009 Toyota Corolla 1.8L. It also covers 2000-2011 Japan-market 1.5L platforms such as the Vitz, Probox, Platz, Allion, Premio, Belta and Vios. OE transmission reference 35330-0W020. One honest note: the 1.5L cars carry the U340E, while the 1.8L Corolla uses the U341E. This kit is built to cover both units, but Toyota used other transmissions in the Corolla in other years. Read the code on the transmission tag before you order, or send us the year and VIN. Valve bodies and other parts for this family are in the Aisin transmission collection.
| Transmission | Toyota U340E / U341E 4-speed FWD |
| OE reference | 35330-0W020 |
| Includes | Frictions, steel plates, seals, gaskets, piston kit |
| Listed fitment | Echo 2000-2005 1.5L, Yaris 2006-2011 1.5L, Corolla 2009 1.8L |
| Shipping weight | 8.82 lb |
It is listed for the 2006-2011 Yaris 1.5L, which uses the U340E. Check the transmission tag before you order. If you are not sure, send us your year and VIN.
The listing includes the 2009 Corolla 1.8L, which uses the U341E version. This kit is built for both the U340E and U341E. Toyota used other transmissions in the Corolla in other years, so confirm the code on your tag.
The clutch pistons have bonded rubber seals that harden with heat. If you reuse them, the new frictions can slip from the start because the pistons cannot hold full apply pressure.
Use the Toyota ATF listed in your owner's manual for your vehicle and year. Do not substitute a generic Dexron-type fluid.
It fixes slipping and flare caused by worn clutches and seals. A harsh shift with clean fluid usually comes from the valve body, so inspect or replace the valve body during the rebuild.
Replace the filter, flush the cooler and lines, and replace the valve body if its bores are worn. Inspect the bushings and drums for scoring before you reassemble the unit.
