Master rebuild kit for the Toyota U340E/U341E 4-speed FWD automatic in the 2000-2005 Echo, 2006-2011 Yaris and Corolla 1.8L.
The little four-speed behind the 1.5L in a 2000-2005 Toyota Echo or 2006-2011 Yaris usually tells you it is worn out the same way: the engine flares on the 2-3 or 3-4 upshift, Reverse takes a moment to bite, and the fluid smells burnt. Once there is friction material in the pan, a drain and fill will not save it. This master overhaul kit is the straightforward soft-parts set for that teardown: friction plates, steel plates, valve body separator gaskets, the pan gasket, lip seals, O-rings and sealing rings. It cross-references OE numbers UT14400A, 35330-0W020, 35330-20020 and 35330-0W021 and ships from the USA.
The U340E is the Aisin-built front-drive four-speed Toyota paired with the 1NZ-FE 1.5L; the 1.8L Corolla got the closely related U341E. Both run the same ratios: 2.847 first, 1.552 second, 1.000 third and a 0.700 overdrive. Each of those gears is held by hydraulically applied clutches and brakes, and in a car this light the unit is small, so the packs are thin and there is little margin once the lining wears. When one pack starts to slip, the heat it makes cooks the seals on the neighbouring pistons. That is why a master kit renews every friction, steel and seal in the case rather than one pack.
Not every U340E complaint is a clutch failure. Transmission Digest documented P0770 on this transaxle family coming from the lockup solenoid circuit, so read the codes and test the solenoids before you pull the unit; our guide to testing a solenoid with a multimeter covers it. If the valve body bores are worn, harsh shifts and delayed engagement can come from there, and a remanufactured U340E valve body is the fix rather than a full rebuild. Good solenoids, burnt fluid and a slip under load mean the clutches are done. Our flare vs. slip guide helps you tell which you are feeling.
Listed for the U340E and U341E: 2000-2005 Toyota Echo 1.5L, 2006-2011 Toyota Yaris 1.5L and the Corolla 1.8L. Toyota fitted the Corolla with more than one transmission over the years, so a model year alone does not settle it. Match the transaxle ID tag against the OE numbers above, or send us your year and VIN. Several Aisin four-speeds look alike from outside, which is the main source of wrong orders on these. Other Toyota units are on our Aisin transmission page.
This is the base kit, without a filter or pistons. If your teardown shows heat-hardened pistons, or you want the filter in the same box, the U340E master kit with filter and pistons covers the Echo with both.
| Transmission | Toyota U340E / U341E 4-speed FWD |
| OE references | UT14400A, 35330-0W020, 35330-20020, 35330-0W021 |
| Listed fitment | 2000-2005 Echo 1.5L, 2006-2011 Yaris 1.5L, Corolla 1.8L |
| Kit type | Master rebuild / overhaul kit |
It is listed for the 2000-2005 Echo 1.5L and the 2006-2011 Yaris 1.5L, both with the U340E. Check the transaxle tag or send us your year and VIN to confirm.
The U340E sits behind the 1.5L 1NZ-FE and the U341E behind the 1.8L in the Corolla. They share gear ratios, and this kit is listed for both.
No. This is the base master kit: frictions, steels, gaskets and seals. Our U340E master kit with filter and pistons adds both.
Yes. Lockup solenoid codes such as P0770 can set on this family without any clutch damage. Test the solenoids and check the fluid before tearing the unit down.
Clear any stored codes and drive the car through all four gears at normal temperature so the computer can settle its shift timing. Recheck the fluid level hot afterward.
