A340E Transmission Valve Body with Solenoids for Lexus

A Lexus LX450, LX470 or GS300 built on the Aisin A340-family rear-wheel-drive four-speed that shifts harsh, skips a gear, or has thrown a shift-solenoid code after you already swapped individual solenoids is usually down to the valve body itself rather than any one part bolted to it. This listing is a complete replacement valve body for the A340, A340E, A340F, A341, A343 and A343E family (also listed for the Volvo AW30-43 and AW30-70LE, which share the same Aisin-Warner design), with the solenoids already mounted and the unit finish-machined before it ships.

Why this family needs careful matching

Sonnax's identification guide for this transmission splits the late-model valve bodies into two distinct castings: a Type 3 body on casting ID 8935 built only for V8 applications with EPC-style electronic throttle control, and a Type 4 body on casting ID 8938 used on either V6 or V8 engines with EPC or cable-style throttle control. The two look similar from across the shop, but the solenoid count, connector style and bolt pattern differ, and Aisin reused this same basic design across Toyota, Lexus and Volvo badges for nearly two decades, which is exactly why a visual match on casting shape alone is not reliable.

Symptoms this valve body addresses

• Harsh, late or flared shifts
• A missing or skipped upshift, or hunting between two gears
• No lockup, or lockup that will not release
• Shift-quality or solenoid fault codes that return after the solenoids alone were already replaced
• Delayed engagement into drive or reverse from a cold start

Confirming it before you order

If you already replaced the shift or lockup solenoids individually and the code or shift complaint came straight back, that points past the solenoids to worn bores or a sticking shift valve inside the casting itself - a point where replacing the solenoid again will not help. Pull your old valve body and count the solenoids and connector pins against the listing photos before ordering, since this family's Type 3 and Type 4 castings are not interchangeable even though Aisin built both on the same basic four-speed architecture.

Fitment

This valve body is listed for the Aisin A340, A340E, A340F, A341, A343 and A343E designations, with Lexus LX450, LX470 and GS300 as the confirmed applications, plus the Volvo AW30-43 and AW30-70LE that share the underlying casting family. Because this platform changed casting and solenoid layout across model years and between 2WD and 4WD builds, pull your pan and compare your old unit's solenoid count, connector style and bolt pattern against our listing photos before ordering, or send your year, model and VIN so we can confirm the correct configuration for you. If your vehicle instead uses the related A341E-badged version of this family, we stock that A341E valve body separately.

Install notes

Drain the pan first, disconnect the solenoid harness, and remove the valve body bolts while holding the checkballs and accumulator springs in place with your fingers so nothing drops into the pan or gets lost on reassembly. Install the new unit with the correct bolt lengths in each position and torque them evenly in sequence rather than corner to corner. Refill with Dexron or Toyota T-IV ATF - T-IV is the safer choice if you cannot confirm what the transmission ran previously - and check the level hot, not cold. Pair this swap with a fresh shift and lock-up solenoid kit if you want spares on hand rather than relying only on the solenoids already mounted to this unit, and consider our A340E shift kit if firmer, more positive shift feel was part of your original complaint. If clutch or band wear is part of the diagnosis rather than just the valve body, the full A340E overhaul kit covers the rest of the rebuild in one order.

Does this fit every vehicle that used an A340-family transmission?

It is listed for Lexus LX450, LX470 and GS300, plus the Volvo AW30-43 and AW30-70LE. This Aisin family changed casting and solenoid layout across years and between 2WD and 4WD builds, so confirm your specific configuration against the listing photos or send your VIN before ordering.

I already replaced my solenoids and the code came back - will this valve body fix it?

That pattern usually points past the solenoids to worn bores or a sticking shift valve inside the casting, which is exactly what a complete valve body replacement addresses.

How do I know if my transmission uses the Type 3 or Type 4 valve body?

Sonnax's identification guide for this family describes Type 3 (casting 8935) as V8-only with EPC throttle control, and Type 4 (casting 8938) as V6 or V8 with either EPC or cable throttle control. Count your solenoids and check your connector style against the listing before ordering.

What fluid should I run after installing this?

Dexron or Toyota T-IV ATF. T-IV is the safer pick if you are not certain what the transmission has run previously, and the level should be checked hot, not cold.

Are the solenoids already installed, or do I need to transfer my old ones?

The solenoids are already mounted to this valve body before it ships, so you are not transferring parts from your old unit.

What else should I check or replace while the valve body is off?

Inspect the checkballs and accumulator springs so nothing gets lost during the swap, and consider a shift kit if firmer shift feel was part of your complaint, or the full overhaul kit if clutch or band wear is also suspected.