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Performance & Replacement Transmission & Drivetrain Parts
Building awesome horsepower is only part of the story. You need to deliver all that power to your car or truck’s wheels! We’ve got torque-hungry high performance automatic...
Building awesome horsepower is only part of the story. You need to deliver all that power to your car or truck’s wheels! We’ve got torque-hungry high performance automatic and manual transmissions for street and strip applications, torque converters and clutch sets, flexplates and flywheels, plus limited-slip differentials, spools, lockers, ring and pinion sets, driveshafts, U-joints, axles, bearings, C-clip eliminator kits, transfer cases, shift kits, and rebuild kits. We also have a wide selection of trans-brakes, shifters, cables, and accessories—everything you need to put the power to the ground, Summit style.
Building awesome horsepower is only part of the story. You need to deliver all that power to your car or truck’s wheels! We’ve got torque-hungry high performance automatic and manual transmissions for street and strip applications, torque converters and clutch sets, flexplates and flywheels, plus limited-slip differentials, spools, lockers, ring and pinion sets, driveshafts, U-joints, axles, bearings, C-clip eliminator kits, transfer cases, shift kits, and rebuild kits. We also have a wide selection of trans-brakes, shifters, cables, and accessories—everything you need to put the power to the ground, Summit style.
Torque Converters, SST Series, 9 in. Diameter, Aluminum Stator, Diode, Turbo Spline, Custom, THM400, THM350, Each
Part Number: FTI-SST89-6T
Not Yet Reviewed
Estimated Ship Date: May 22, 2026 if ordered today
Estimated Ship Date: May 22, 2026 if ordered today
10" GM EXTRA LS XHD-XHD 2500-2900 RPMS-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-10000XLSXHD
Not Yet Reviewed
Estimated Ship Date: Jun 29, 2026 if ordered today
Estimated Ship Date: Jun 29, 2026 if ordered today
Torque Converters, SST Series, 9 in. Diameter, Aluminum Stator, Diode, Turbo Spline, 4,200-4,600 Stall, THM400, THM350, Each
Part Number: FTI-SST89-8
Not Yet Reviewed
Estimated Ship Date: May 22, 2026 if ordered today
Estimated Ship Date: May 22, 2026 if ordered today
Torque Converters, SST Series, 9 in. Diameter, Aluminum Stator, Diode, Turbo Spline, 3,400-3,800 Stall, THM400, THM350, Each
Part Number: FTI-SST89-0
Not Yet Reviewed
Estimated Ship Date: May 22, 2026 if ordered today
Estimated Ship Date: May 22, 2026 if ordered today
MECHANICAL DIODE
Part Number: SOX-GM-MD-3
Not Yet Reviewed
Estimated Ship Date: May 21, 2026 if ordered today
Estimated Ship Date: May 21, 2026 if ordered today
MECHANICAL DIODE
Part Number: SOX-GM-MD-10S
Not Yet Reviewed
Estimated Ship Date: May 21, 2026 if ordered today
Estimated Ship Date: May 21, 2026 if ordered today
GM T-350-400 BIG SHOT 10 LS-XHD 2900-3300 RPMS-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-10000LSXHD
Not Yet Reviewed
Estimated Ship Date: Jun 29, 2026 if ordered today
Estimated Ship Date: Jun 29, 2026 if ordered today
Torque Converters, SST Series, 9 in. Diameter, Aluminum Stator, Diode, Turbo Spline, Custom, THM400, THM350, Each
Part Number: FTI-SST89-0T
Not Yet Reviewed
Estimated Ship Date: May 22, 2026 if ordered today
Estimated Ship Date: May 22, 2026 if ordered today
GM TH350-400-XHD 3300-3700 RPMS-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-10000MSXHD
Not Yet Reviewed
Estimated Ship Date: Jun 24, 2026 if ordered today
Estimated Ship Date: Jun 24, 2026 if ordered today
FORD C-6 BIG SHOT 10 HS XHD-1.375 PILOT-3700-4100 RPMS-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-10200HSXHD
Not Yet Reviewed
Estimated Ship Date: Jun 24, 2026 if ordered today
Estimated Ship Date: Jun 24, 2026 if ordered today
Torque Converters, SST Series, 9 in. Diameter, Aluminum Stator, Diode, Turbo Spline, Custom, THM400, THM350, Each
Part Number: FTI-SST89-7
Not Yet Reviewed
Estimated Ship Date: May 22, 2026 if ordered today
Estimated Ship Date: May 22, 2026 if ordered today
9" STREET/STRIP-HEAVY DUTY SPRAG-GM-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-900XHDLS
Not Yet Reviewed
Estimated Ship Date: Jun 25, 2026 if ordered today
Estimated Ship Date: Jun 25, 2026 if ordered today
FORD C-6 BIG SHOT 10 LS XHD-1.375 PILOT-2900-3300 RPMS-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-10200LSXHD
Not Yet Reviewed
Estimated Ship Date: Jun 25, 2026 if ordered today
Estimated Ship Date: Jun 25, 2026 if ordered today
GM 700R4 BIG SHOT 10-LOCKUP LS-2,900-3300 RPMS-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-10050LS
Not Yet Reviewed
Estimated Ship Date: Jun 24, 2026 if ordered today
Estimated Ship Date: Jun 24, 2026 if ordered today
TORQUEFLIGHT 727-BIG SHOT XLS-2500-2900 RPMS-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-10400XLSXHD
Not Yet Reviewed
Estimated Ship Date: Jun 25, 2026 if ordered today
Estimated Ship Date: Jun 25, 2026 if ordered today
9" STREET/STRIP-HEAVY DUTY SPRAG-727-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-905XHDHS
Not Yet Reviewed
Estimated Ship Date: Jun 29, 2026 if ordered today
Estimated Ship Date: Jun 29, 2026 if ordered today
DIODE, MECHANICAL, 27 TOOTH, 5 STRUT, TF-904
Part Number: ATI-ATI909932
Not Yet Reviewed
Estimated Ship Date: May 1, 2026 if ordered today
Estimated Ship Date: May 1, 2026 if ordered today
FORD C-6 BIG SHOT 10 LS XHD-1.848 PILOT-2900-3300 RPMS-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-10201LSXHD
Not Yet Reviewed
Estimated Ship Date: Jun 25, 2026 if ordered today
Estimated Ship Date: Jun 25, 2026 if ordered today
FORD C4 1970-UP 10 1/2 BC-BIG SHOT 10 LS XHD-2900-3300 RPMS-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-10101LSXHD
Not Yet Reviewed
Estimated Ship Date: Jun 25, 2026 if ordered today
Estimated Ship Date: Jun 25, 2026 if ordered today
9" STREET/STRIP-HEAVY DUTY SPRAG-GM-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-900XHDMS
Not Yet Reviewed
Estimated Ship Date: Jun 24, 2026 if ordered today
Estimated Ship Date: Jun 24, 2026 if ordered today
GM 4L60E LS1-LOCKUP-3700-4100-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-10052HS
Not Yet Reviewed
Estimated Ship Date: Jun 24, 2026 if ordered today
Estimated Ship Date: Jun 24, 2026 if ordered today
STATOR CAP, FOR DIODE, A SIDE, 8/9, FTI STATOR ONLY
Part Number: ATI-ATI452605
Not Yet Reviewed
Estimated Ship Date: May 1, 2026 if ordered today
Estimated Ship Date: May 1, 2026 if ordered today
9" STREET/STRIP-HEAVY DUTY SPRAG-GM-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-900XHDHS
Not Yet Reviewed
Estimated Ship Date: Jun 25, 2026 if ordered today
Estimated Ship Date: Jun 25, 2026 if ordered today
FORD C4 1970-UP 11 7/16 BC-BIG SHOT 10 HS XHD-3700-4100 RPMS-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-10102HSXHD
Not Yet Reviewed
Estimated Ship Date: Jun 15, 2026 if ordered today
Estimated Ship Date: Jun 15, 2026 if ordered today
FORD C4 1970-UP 10 1/2 BC-BIG SHOT 10 HS XHD-3700-4100 RPMS-WITH MECHANICAL DIODE SPRAG
Part Number: TOS-10101HSXHD
Not Yet Reviewed
Estimated Ship Date: Jun 25, 2026 if ordered today
Estimated Ship Date: Jun 25, 2026 if ordered today
