Lexus LS400 & SC400 A341E Transmission

LEXUS 1UZFE MODS FORUMS - Post Questions Here For Quick Answers!

DESCRIPTION

The A341E automatic transmission is a 4–speed Electronically Controlled Transmission with an intelligent

control (hereafter called ECT–i) developed exclusively for the Lexus LS400. The A341E automatic transmission

has the following features.

When shifting the transmission, the engine torque is controlled and the clutch hydraulic pressure in the

transmission is electronically controlled to reduce transmission shift shock.

A new type of ATF (ATF Type T–II) is used which provides improved shifting characteristics and prevents

deterioration in the AFT over time.

HINT: For the A341E automatic transmission, use ATF Type T–II or equivalent.

A super flow torque converter is used to improve the transmission efficiency.

The A341E automatic transmission is mainly composed of the torque converter with lock–up clutch,

4–speed planetary gear unit, the hydraulic control system and the electronic control system.

To minimize the possibility of incorrect operation of the automatic transmission, a shift lock mechanism has

also been added.

 

 

General Specifications

Type of Transmission A341E
Type of Engine 1UZ–FE
Stall Torque Ratio 1.900 : 1
Lock–Up Mechanism Equipped
1st Gear 2.531
2nd Gear 1.531
3rd Gear 1.000
O/D Gear 0.705
Reverse Gear 1.880
C1 Foward Clutch 6/6
C2 Direct Clutch 4/4
C0 O/D Direct Clutch 2/2
B2 2nd Brake 5/5
B3 1st & Reverse Brake 7/7
B0 O/D Brake 5/4
2nd Coast Brake (B) Band Width mm (in.) 40 (1.57)
F1 No.1 One–Way Clutch 22
F2 No.2 One–Way Clutch 28
F0 O/D One–Way Clutch 24
No. of Sun Gear Teeth 42
No. of Pinion Gear Teeth 19
No. of Ring Gear Teeth 79
No. of Sun Gear Teeth 42
No. of Pinion Gear Teeth 19
No. of Ring Gear Teeth 79
No. of Sun Gear Teeth 33
No. of Pinion Gear Teeth 23
No. of Ring Gear Teeth 79

SC400-A340E

DESCRIPTION


The A340E automatic transmission is a 4–speed Electronically Controlled Transmission with an intelligent control

(hereafter called ECT–i) like the A341 E automatic transmission used in the LS400. The A340E automatic

transmission has the following features.

• When shifting the transmission, the engine torque is controlled and the clutch hydraulic pressure in the

transmission is electronically controlled to reduce transmission shift shock.

• A new type of ATF (ATF Type T–II) is used which provides improved shifting characteristics and prevents

deterioration in the ATF over time.

HINT: For the A340E automatic transmission, use ATF Type T–II or equivalent.

• A super flow torque converter is used to improve the transmission efficiency.

The A340E automatic transmission is mainly composed of the torque converter with lock–up clutch, 4–speed

planetary gear unit, the hydraulic control system and the electronic control system.

To minimize the possibility of incorrect operation of the automatic transmission, a shift lock mechanism has also

been added.

Do you have any questions? If so, please head over to the forums to get a quick answer or share your experience!

This is a freelance site with no support by huge companies.  I have been doing most of the R&D and technical write-ups by myself with my personal money and literally thousands of hours of my time.  I have taken extra steps to demonstrate in details how things are done.  Currently I am one of the few people doing Lexus V8 research and performance enhancement.  This effort comes from my personal love for this wonderful engine.  Most of the modifications are from trial and error. There's no cookbook for 1UZFE mods and its unknown territory for much of supercharger performance.  The parts, labor, web development and site hosting are 100% paid from my personal hobby money.  If you feel my efforts help you in any form, please do not hesitate to donate any amount of money to support this site. You have no idea how much I and the entire Lexus and Toyota community appreciate it!

One thought on “Lexus LS400 & SC400 A341E Transmission”

  1. Do you have any questions? If so, please head over to the forums to get a quick answer or share your experience!

    This is a freelance site with no support by huge companies.  I have been doing most of the R&D and technical write-ups by myself with my personal money and literally thousands of hours of my time.  I have taken extra steps to demonstrate in details how things are done.  Currently I am one of the few people doing Lexus V8 research and performance enhancement.  This effort comes from my personal love for this wonderful engine.  Most of the modifications are from trial and error. There's no cookbook for 1UZFE mods and its unknown territory for much of supercharger performance.  The parts, labor, web development and site hosting are 100% paid from my personal hobby money.  If you feel my efforts help you in any form, please do not hesitate to donate any amount of money to support this site. You have no idea how much I and the entire Lexus and Toyota community appreciate it!

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