| TYPE | PCD | DISC | SPRING | Size & No. of Ring Gear Bolts | No. of Serration Teeth(T) | Flange In Dia.(Φ) | Initial Torque Pre Setting (kg.m) | Super High Initial | Pressure Ring Ring Cam Angle (°) |
||||||
| Ext Dia. | No. (In Dia.) | No. (Ex Dia.) | Thick-ness | No. Ex Teeth | No. In Teeth | No. Teeth N/A | No. Teeth N/A Strengthe-ning | ||||||||
| FA2 | 160 | 106 | 8 | 8 | 1.7 | 2 | 0 | 0 | N/A | Φ12.7(10) | 34T | 37 | 9-11 | ◯ | 60ｘ60 |
| FA1 | 40ｘ30 | ||||||||||||||
TYPE-FA
Main body dimensions.
| Size of ring gear bolts | Φ12.7 |
| Number of ring gear bolts | 10 |
| Ring gear bolts PCD | 160 |
Dimensions of the flanges left side slot
| Number of Teeth | 34Ｔ |
| Snap ring | Without |
| Washer | Without |
| Snap ring groove | Without |
| The manufacturers genuine parts side flange part number. |
- |
Dimensions of the flanges Right side slot
| Number of Teeth | 34Ｔ |
| Snap ring | Without |
| Washer | Without |
| Snap ring groove | Without |
| The manufacturers genuine parts side flange part number. |
- |
FA High Initial Torque SPEC.
[PLATE LOCATION FOR REBUILDS]
[EXAMPLE : INCREASING INITIAL TORQUE]
| LOCATION | TYPE | NO. OF DISCS |
INCREASED INITIAL TORQUE NO. OF POATES |
STOCK INITIAL TORQUE i.e. ICREASED TORQUE(kg・m) |
| ② | SPRING DISC (OUTER TEETH) |
2 | 2 | 9.0-11.0 | 11.0-13.0 |
| ③ | SPRING DISC (INNER TEETH) |
- | 2 | |
| ④ | FRICTION DISC (OUTER TEETH) |
8 | 8 | |
| ⑤ | FRICTION DISC (INNER TEETH) |
8 | 6 |
Click here to confirm model type compatiblity
Check the product for a stamped "TOMEI" & product "Type" on the case of the product,some older models do not have the type name on the case.
You can refer to this page to confirm the model when there is no type name stamped on the product.
If you are going to use the product on another vehicle,
you can use this as a reference to confirm compatibility.
Precision Traction. Ultimate Stability.
Pure Mustang.
| TYPE | PART No. | PRODUCT NAME | |
| 2WAY | TC101A-FRFA2 | LSD TECHNICAL TRAX ADVANCE 2WAY FORD MUSTANG S550/S650 Super 8.8″ FA2 INVENTORY→ |
 |
| 1.5WAY | TC101B-FRFA1 | LSD TECHNICAL TRAX ADVANCE 1.5WAY FORD MUSTANG S550/S650 Super 8.8″ FA1 INVENTORY→ |
APPLICATION
| MAKER | MODEL YEAR |
MODEL | ENGINE | OEM DIFF | TRANS- MISSION |
| FORD | 2015- 2023 |
MUSTANG S550 |
2.3L ECO BOOST I4 | 3.31 Traction-Lok LSD 3.55 Traction-Lok LSD 3.73 Torsen LSD (3.15 Traction-Lok LSD is not Compatible) |
MT/AT |
| 3.7L Ti-VCT V6 | |||||
| 5.0L Ti-VCT V8 | |||||
| 5.2L Ti-VCT V8 | |||||
| 2024+ | MUSTANG S650 |
2.3L ECO BOOST I4 | 3.55 Traction-Lok LSD 3.73 Torsen LSD (3.15 Traction-Lok LSD is not Compatible) |
||
| 5.0L Ti-VCT V8 | |||||
| 5.0L COYOTE V8 |
We are proud to announce the release of the TOMEI TECHNICAL TRAX L.S.D., developed specifically for the S550 Mustang (2015–2023) and S650 Mustang (2024+).
Whether you’re driving the EcoBoost 2.3L Turbo, the mighty 5.0L V8 GT, Mach 1, or the naturally aspirated 5.2L V8 GT350—this L.S.D. is built to deliver authentic performance for every S550/S650 owner seeking true rear-wheel-drive control.
Why L.S.D. for the S550/S650 Mustang?
The biggest leap forward in the 6th generation Mustang lies in its Independent Rear Suspension (IRS). To fully unlock the benefits of this configuration, precise rear wheels control is essential. Installing the Technical Trax L.S.D. transforms your Mustang with:
・Dramatically improved traction
・Sharper cornering performance
・Shorter lap times on track
・Enhanced straight-line stability for street use
・Greater control in drifting scenarios
Features of the TOMEI TECHNICAL TRAX L.S.D.
・Available in 1.5-WAY and 2-WAY configurations
・High initial torque design—ideal for high-powered Mustangs
・Compatible with OEM Torsen L.S.D., and clutch-type L.S.D. setups
・Designed to fit S550 and S650 grades—from EcoBoost to GT350
This is not just an upgraded L.S.D.
It’s a breakthrough in driving dynamics that turns your Mustang into a true rear-wheel-drive sports machine.
Experience the transformation. Feel the difference.
“For the True Driving Enthusiasts.”
Now available.No more compromises in your Mustang’s performance.
This is not just a upgraded L.S.D.
Black Colored Forged L.S.D. Case
HIGHEST INITIAL TORQUE SPRING DISCS IN THE INDUSTR
The ultra-compact spring discs were designed to increase clutch capacity in order to maintain high initial torque. The spring discs also have a variable spring rate construction in order to minimize warping and maximize longevity even after hard driving or extended use.
SPRING DISC
The ultra-compact spring discs were designed to increase clutch capacity while maintaining high initial torque.
VARIABLE RATE SPRING DISC
By utilizing a variable spring rate construction, the spring disc can withstand hard driving and extended use without warping.
HIGH PERFOEMANCE FRICTION DISCS FOR CONSISTENT POWER/TORQUE TRANSFER
The TOMEI L.S.D. utilizes 16 high quality friction disks to ensure that power and torque is transmitted to rear wheels in a smooth manner to allow for precise vehicle control and the ultimate driving experience.
The new and improved Tomei ADVANCE DISC allows for a quieter and more refined driving experience. Unlike other L.S.D.s, the Tomei L.S.D. is offers greater stability during throttle transitions. It eliminates loud clunking noises, making it a highly streetable yet aggressively tuned L.S.D.
1.5WAY / 2WAY
1.5 WAY
The 1.5 way L.S.D. locks up during during acceleration and unlocks during deacceleration. This allows for a more natural feeling under hard braking.
2 WAY
The 2 way L.S.D. locks up on both acceleration and deacceleration. This allows for more precise control of the car using the throttle, which is very beneficial for drifiting.
SPECIFICATION
| TYPE | FA1/FA2 |
| PCD | 160mm |
| Disc Diameter | Φ106 |
| Disc (IN Teeth) | 8 |
| Disc (EX Teeth) | 8 |
| Disc Thickness | 1.7mm |
| Spring | 2 |
| No. & Size of Ring Gear Bolts | Φ12.7 (10) |
| No. of Teeth | 34T |
| Inner Flange Diameter | Φ37 |
| Initial Torque | 9.0 – 11.0 kgf・m |
| Pressure Ring cam Angle | FA1 : 40°x 30° FA2 : 60°x 60° |
GEAR OIL INCLUDED
The L.S.D. kit will come with 2 liters of GL-5 80w-90 TOMEI hypoid L.S.D. gear oil. This oil must be used in conjunction with the TOMEI Technical Trax L.S.D. unit. When using the TOMEI Technical Trax L.S.D. with another brand or grade gear oil, the L.S.D. may make a louder chattering sound and increase the wear of the L.S.D. which may result in a decreased life span of the L.S.D. Gear oil with higher viscosity and higher pressure type lubricants may also increase the chattering noise of the L.S.D.
