U151E Overhaul Kit, new and ready to install. Fits the U151E. Ships fast from the USA.
The U151E is the 5-speed front-drive transaxle Toyota and Lexus put behind the 3.0L, 3.3L and 3.5L V6 in the Camry, Solara, Avalon, Sienna, Highlander, RAV4 V6, ES and RX through the 2000s. When one of these starts to slip into 3rd or 4th, flares on the 2-3 shift, or engages late after sitting overnight, the cause on a high-mileage unit is very often hardened piston seals and worn sealing rings. This overhaul kit is the sealing side of a U151E rebuild: the full gasket and seal set plus bonded pistons, for the U150E, U151E and U151F from 2002 on.
Because the kit stops at seals and pistons, plan the rest of the rebuild around what you find. A worn front pump bushing or scored pump gears call for the U151E pump, and a cracked or worn drum calls for the U151E clutch drum.
The U151E uses clutches and brakes applied by oil pressure from the valve body. Line pressure is set by the SLT solenoid and the boost valve, then shift solenoids SL1, SL2 and SL3 meter that pressure into each apply circuit. Oil has to travel through sealing rings on the shafts and drums and then push a rubber-bonded piston against the clutch pack. When a sealing ring wears its groove or a piston lip shrinks, the pack sees less pressure than the computer commands and starts to slip. The ECU compensates by stretching fill times, which is why a worn U151E often shifts late and soft first, then begins to flare, before it finally slips outright.
Rule out the electrical side first. The GEARS magazine article on U150/U250 shift problems recommends clearing the ECU memory, then testing SL1, SL2 and SL3 voltage and the computer ground, because a bad ground or tired solenoid feels exactly like worn seals. Check the fluid level at operating temperature at the check plug, and look at what comes out of the pan. If the fluid is burnt and the pan shows clutch material, the unit needs to come apart and this kit is the base of the job. Our guide to Aisin slipping under load and the Toyota Camry transmission service guide cover the checks in more detail.
Listed for the U150E, U151E (AW95-51LS) and U151F, 2002 and up: V6 Camry and Solara, Avalon, Sienna, Highlander 3.3L/3.5L, RAV4 3.5L V6, Lexus ES300/ES330 and RX330/RX350. The 4-cylinder 2.4L Camry uses the U250E, which is a different transaxle; see the U151E banner kit and our Aisin transmission parts collection for related parts. Check the ID tag on the case, and if you are not sure, send us your year and VIN before ordering. AWD U151F units have transfer case seals that may need a separate kit.
Soak lip seals and pistons in Toyota WS fluid before assembly and use assembly gel on sealing rings. Look closely at every ring groove; a new ring in a stepped groove will still leak. Air check each clutch and brake circuit with the case open. If the valve body has been out, Sonnax warns that 4-speed and 5-speed boost sleeves look alike but cannot be interchanged, and the adjustable step must go back in the same position or the unit will have no line rise. Refill with Toyota WS only, then clear the transmission memory and drive gently through all gears so the ECU relearns fill times on the new seals. If the valve body itself has a history of codes, replace it now with our U151E valve body.
| Fits | U151E |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | OEM |
| Reference | U150E |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It includes the bonded pistons except the largest one, the overdrive direct piston. Reuse yours if it is in good condition or order it separately.
No. The 4-cylinder Camry uses the U250E. This kit is for the V6 U150E, U151E and U151F.
No. This is the seal, gasket and piston set. Add a friction pack or choose a banner or master rebuild kit if you need clutches.
Toyota WS ATF. Check the level at operating temperature through the fill and check plug, not by guessing the amount.
Yes. Clear the transmission memory so the ECU drops old adaptive values, then drive it gently through every gear.
