Three-piece solenoid set, both two-way shift solenoids plus the lock-up solenoid, for the Toyota A340E and A343F in 2002-2004 Tacoma, 4Runner and Tundra.
If your 2002-2004 Tacoma, 4Runner, Tundra or Sequoia, or a 2000-2002 Lexus LX470, is launching in second, hanging in third, refusing overdrive or showing a tach that never drops into lock-up on the interstate, this three-piece set covers the electrical parts most often behind it. It contains the two shift solenoids and the lock-up (TCC) solenoid that mount on the valve body of the Toyota A340E and A343F four-speed automatics. It is the bare solenoid set, about 7 ounces shipped, for owners who already have a filter and gasket or only want to swap the solenoids.
The A340 family has no throttle cable deciding shift points on these years; the engine computer chooses every gear by turning shift solenoid 1 and shift solenoid 2 on or off in set combinations. Because the two work as a pair to produce all four ratios, one sticking solenoid scrambles the whole pattern rather than a single shift. The third solenoid controls the clutch inside the torque converter, applying it at steady cruise so the engine and transmission turn together and fluid temperature stays down.
A code names a circuit, not a part. In one documented 2002 Tacoma case, a P0755 shift solenoid B code with second-gear starts, no fourth and no reverse was finally traced to a loose engine-bay ground putting voltage on the S2 wire, after the shop had already replaced a solenoid, a valve body and the computer. So check grounds and back-probe the solenoid wires before ordering, then measure each solenoid's resistance and compare them; our solenoid multimeter guide explains the meter work. If shifts are late or harsh and the electrical side is clean, work through the Aisin harsh and delayed shift walkthrough. Dark, burnt fluid means the clutches are already hurt and solenoids alone will not fix slipping.
The listing covers the A340E and A343F in 2002-2004 Toyota Tacoma, 4Runner, Tundra and Sequoia and the 2000-2002 Lexus LX470, two- and four-wheel drive. Interchange numbers for the set are 85420-30110, 85420-301230, 35250-50030, 35250-30070 and 35250-30050. Units from 2000 on use the later valve bodies Sonnax identifies as Type 3 (casting 8935, V8 trucks with electronic throttle) and Type 4 (casting 8938, V6 or V8), so a V6 Tacoma and a V8 Tundra can carry different castings. Not every truck in those years has an A340: the 2003-2004 4Runner with the 4.7L V8 uses a five-speed automatic. Read the transmission code on the ID tag, compare your old solenoids with the photos, or send us the year and VIN. More parts are on our Aisin transmission parts page.
If you want the filter and pan gasket in the same box, choose the A340E solenoid kit with filter and gasket. When valves are sticking rather than solenoids failing, the A340E valve body is the next step, and a truck that tows hard benefits from the TransGo 340-HD2 reprogramming kit while the pan is down.
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Three solenoids: shift solenoid 1, shift solenoid 2 and the lock-up (TCC) solenoid. There is no filter, pan gasket or connector clip in this set; reuse your clips.
It fits the 2003-2004 4Runner with the A340-family four-speed. The 4.7L V8 4Runner of those years uses a five-speed automatic and is not covered. Check the transmission code on the tag or send us the VIN.
P0750 and P0755 are the shift solenoid A and B circuit codes, and P0740/P0741 relate to the torque converter clutch. A code points to a circuit, so test wiring and grounds before replacing the solenoid.
No. On these units the solenoids are reached by dropping the pan and filter; each one comes out after removing its bolt and bracket.
Use the Dexron-type or Toyota T-IV ATF your owner's manual specifies, and set the level with the engine idling, fluid hot and the truck level.
It fixes shudder caused by a sticking or leaking solenoid. If the converter clutch lining is worn, fresh fluid and a new solenoid may not stop it, so road test after the job.
