Frictions, steels, seals and gaskets to overhaul a Toyota/Lexus A341E (30-41LE) four-speed behind the 1UZ, 2JZ and 3UZ.
If your Lexus SC400 hesitates going into Drive, flares between third and fourth on the highway, or leaves dark, burnt fluid on the dipstick, the four-speed behind the 1UZ-FE V8 is usually past the point where a fluid change helps. This master rebuild kit carries the wear parts for a full overhaul of the A341E, the unit Toyota also calls the 30-41LE: friction plates, steel plates, the rubber and sealing-ring kit, the two valve body separator plate gaskets, the cork pan gasket, front and rear seals and the plastic thrust washers.
The A341E is a rear-drive, four-speed electronic automatic built for torquey engines: the V8 Soarer, Crown Majesta and SC 400, plus several JZ six-cylinder applications. Every gear depends on hydraulic pressure squeezing a clutch pack or brake, so the job of this kit is to restore both halves of that system at once. New frictions and steels give each pack its full holding capacity again, and new lip seals, O-rings and sealing rings stop the pressure leaks that let those packs slip in the first place. Replacing only one half rarely lasts: fresh frictions on hardened seals still slip, and fresh seals on glazed frictions still flare.
Pull the pan and look at what is in it. A light film is normal; flakes of friction material, chunks of facing or aluminum glitter mean a pack has failed. Check the fluid level and condition hot, then road test and note exactly which shift slips. A slip in one gear only that also sets a solenoid fault can be electrical or a stuck valve, so read our guide to Aisin slipping under load and the difference between a flare and a slip before you commit to pulling the unit. If the solenoids test bad but the packs are healthy, an A341E solenoid kit may be the cheaper fix.
The listing covers the A341E / 30-41LE used in the Lexus SC400, SC300, LS400, GS400, GS300, LX470 and Toyota Supra. Toyota spread these vehicles across several related units, so check before ordering. Published application lists put most U.S. SC400s and the early LS400 on the closely related A340E, list the A341E for the 1993-1995 GS300 and 1995-1997 LS400, and show the late SC400, GS400 and later LS400 moving to the five-speed A650E, which this kit does not fit. The LX470 is normally an A343F four-wheel-drive unit. The fastest check is the ID plate on the case and the cast letter on top of the bell housing: a U marks the V8 bolt pattern and a J marks the JZ six. If you are unsure, send us your year and VIN before ordering. You can browse other Aisin parts on our Aisin transmission collection.
Strip the unit completely, wash every drum and the case, and inspect the pump body and bushings, drum bores and planetary carriers; the kit does not include bushings, hard parts or a torque converter. Soak each new friction in clean T-IV type fluid for at least 30 minutes, stack the packs dry first to measure clearance, and correct with selective plates where needed. Replace every seal and ring in the kit even when an old one looks fine, then air-check each clutch and brake circuit before the valve body goes on. A pump with a scored body or a worn bushing will undo the rebuild, so a replacement A341E pump is worth having on the bench if yours fails inspection. Refill with a Toyota T-IV type fluid such as Idemitsu ATF Type TLS, check the level hot, and drive it gently for the first few hundred miles while the new frictions bed in.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Not necessarily. Published lists put many SC400s on the A340E and the late cars on the five-speed A650E. Read the ID plate on the case and the cast letter on the bell housing, or send us your year and VIN before you order.
The kit contents are friction plates, steel plates, the seal and O-ring kit, paper and cork gaskets, front and rear seals and thrust washers. A filter, bushings and hard parts are not listed, so plan to buy them separately if your teardown needs them.
Toyota specified Type T-IV fluid for this family. Use T-IV or a licensed T-IV equivalent, soak the new frictions in the same fluid, and set the final level with the transmission at operating temperature.
A single-gear slip can be a solenoid, a stuck valve or one worn pack. Diagnose first. If the pan shows friction debris or the fluid is burnt, the other packs have taken heat too, and a full overhaul with this kit is the safer repair.
The LX470 is listed with the A343F four-wheel-drive unit in published references. Confirm the code on your ID plate; if it reads A343F, contact us so we can match the right kit.
