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Fast C12JZSDQXL320A AMT Transmission

FAST C12JZSDQXL320A is Twin Countershaft AMT transmission has 12 forward gears, the gear ratio steps are arranged reasonably, and has very outstanding fuel economy performance. With double intermediate shaft structure design and integrated with a synchronizer, the maximum input speed is 2600 RPM. The length of the C12JZSDQXL320A transmission is 927.87 mm. The C12JZSDQXL320A gearbox has 12 different gears, and the reduction ratio of each gear is different. The 1st gear reduction ratio is 12.260, 2nd gear reduction ratio is 9.556, 3rd gear reduction ratio is 7.356, 4th gear reduction ratio is 5.734, 5th gear reduction ratio is 4.521, 6th gear reduction ratio is 3.524, 7th gear reduction ratio is 2.712, The 8th gear reduction ratio is 2.114, the 9th gear reduction ratio is 1.627, the 10th gear reduction ratio is 1.268, 11th gear reduction ratio is 1.000, 12th gear reduction ratio is 0.779, and the reverse gear 1 ratio is 11.280, and the reverse gear 2 ratio is 8.790.

FAST 12-speed AMT series transmission have different models, with code D in the model name indicates the structural design of the transmission single box, with code S in the model name means transmission with Double Intermediate Shaft design, with code X in the model name means auxiliary transmissions adopt helical gears, with code L in the model name indicates that the transmission is made of aluminum alloy.

Shaanxi Fast Group Co.Ltd. is the world’s largest heavy-duty transmission design, development, manufacturing and export base. It has been awarded the qualification of “National Inspection-free Product Quality” for automotive gears by the General Administration of Quality Supervision, Inspection and Quarantine, and the title of “China Famous Trademark” by the State Administration for Industry and Commerce. Fast has been awarded the title of “China’s 100 Excellent Auto Parts Suppliers” for 16 consecutive years. The company’s various business indicators have ranked first in China’s gear industry for 17 consecutive years, and the annual production and sales of heavy-duty vehicle transmissions have ranked first in the world for 14 consecutive years.

Advantages of C12JZSDQXL320A AMT Transmission

1. It is synchronized with CMI’ advanced design and sophisticated manufacturing, adapts to harsh working conditions, and has high-intensity and heavy-duty work capabilities.
2. The Holset wastegate valve makes the low speed performance more perfect and the power performance better.
3. The cylinder block and cylinder head adopt integrated design to prevent the occurrence of engine water and oil leakage. The parts are 40% less than other similar engines, and the failure rate is greatly reduced.
4. Using forged steel camshaft and crankshaft, high-strength cylinder design, many parts are cast on the cylinder, with high rigidity, high pressure resistance, good reliability and longer service life.
5. The cylinder liner adopts a platform mesh honing design, which effectively prevents oil leakage with a perfect geometric structure, and adopts advanced technology such as new piston ring components and gasket crimping molding to reduce oil loss.

Technical Specifications

Basic Introduction of Shaanxi Fast C12JZSDQXL320A AMT

Transmission Model: C12JZSDQXL320A
Transmission Application: Automated Manual Transmission
Input Torque: 3200 N.m
Maximum Speed: 2600 RPM
Installation length:

927.87 mm

Weight Iron/Al Alloy: 290 Kg
Fuel Quantity: 15 L
Speed Ratio: 12.260-0.779
Lead Time: 15-30 Working Days
Payment Terms: T/T ,L/C
The picture of Performance Curve-DCEC Cummins Industrial Engine

Transmission Model

Input Torque

Maximum Speed

Speed Ratio

C10JZSQXL180 800 N.m 2600 RPM 270 Kg
C10JZSQXL200A 2000 N.m 2600 RPM 270 Kg
C12JZSDQXL280 2800 N.m 2600 RPM 290 Kg
C12JZSDQXL320A 3200 N.m 2600 RPM 290 Kg
C16JZSDQXL220 2200 N.m 2600 RPM 291 Kg
C16JZSDQXL240A 2400 N.m 2600 RPM 291 Kg
C16JZSDQXL260 2600 N.m 2600 RPM 291 Kg
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Shaanxi Fast C12JZSDQXL320A AMT-Automatic Manual Transmission Data Sheet

Model C12JZSDQXL320A Input TorqueN.m 3200
Maximum SpeedRPM 2600 Lengthmm 927.87
Weight Iron/Al Alloy (Kg) 290 Oil (L) Tol. ±4% 15

Speed Ratio of Shaanxi Fast C12JZSDQXL320A AMT-Automatic Manual Transmission

1st Gear 12.26 2nd Gear 9.556 3rd Gear 7.356
4th Gear 5.733 5th Gear 4.521 6th Gear 3.524
7th Gear 2.711 8th Gear 2.113 9th Gear 1.626
10th Gear 1.268 11th Gear 1 12th Gear 0.779
R1 11.28 R2 8.79
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Scopes of Supply of Shaanxi Fast C12JZSDQXL320A Automated Manual Transmission

1. Electrical Shifting Systerm 2. TCU clutch control unit 3. Speed sensor
4. Distance Sensor 5. Temperature Sensor 6. Preesure Sensor
7. Main Box 8. Auxiliary Box 9. Gearbox Housing
10. Countershaft Braker 11. Braker Solenoid Valve
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Optional Accessories of Shaanxi Fast C12JZSDQXL320A Automated Manual Transmission

1. Shift Handle 2. Clutch Assembly 3. Power Takeoff
4. Hydraulic Retarder Comes With Lubricating Oil Pump
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Modifiable Components of Shaanxi Fast C12JZSDQXL320A Automated Manual Transmission

1. Helical Teeth 2. Straight Teeth 3. Lubricating Oil Pump
4. Triple Cone Synchronizer 5. Fast Switching of Auxiliary Box
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Note: All Above Data are Just for Referenece, All Data Might Change Without Notices or Update, Please Contact Our Sales Team to Confirm All Details Via WhatsApp or Email.

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Sales Team


Automotive Engine - Mr. Wells Luo

Sales Director - Mr. Jasper Lee      

Service Team


Technical Service - Mr. Vin Hu

Customer Service - Mrs. Wendy Fu

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