Hard Parts

TH400 Forward Direct Clutch HD Aluminum Piston

TH400 Heavy Duty Forward & Direct Spring Retainer (Pack of 5) by Sonnax 8679934

TH400 Heavy Duty Forward/Direct Spring RetainerPart No. 34554-12OE Part No. 8679934 Package Quantity: 5 Sonnax heavy duty forward/direct spring retainer 34554-12 is ideal for GM TH400 performance applications when stronger release springs are used. OE...

Dipstick Tube Repair End fpr GM, Ford, & Chrysler (Includes Hat Seal) (Can be Braised)

SKU# K35999RFits Ford, Chrysler & GM (with GM hat seal) Made of steel so it can be braised.

TH400 Heavy Duty Billet Intermediate Shaft by TCS

TH400 Heavy Duty Billet Intermediate Shaft by TCS Made from 300M steel. Designed for high horsepower and off-road use. The shaft is a 100% drop-in product. Note* For ultimate performance, combine this shaft with the TCS billet aluminum high drum with...

TH400 4L80E HD Low/Revers Servo Piston | Sonnax | Pre-1996

TH400 4L80E HD Low/Revers Servo Piston (95-Earlier) by Sonnax Heavy Duty Low/Reverse Servo PistonPart No. 34914-01 Fits all TH400 & '95-earlier 4L80-E. OE Part No. 24232745 OE cast aluminum servo pistons can be brittle and are prone to...

TH400 Externally Adjustable Low/Reverse Servo Kit | Sonnax

Designed for GM TH400 racing transmissions, Sonnax externally adjustable low/reverse servo kit 34914-20K makes band maintenance quick and easy. It’s an ideal way to improve reliability and make staging more consistent and predictable. Checking L/R...

4L80E 4L85E TH400 HD Intermediate Clutch Outer Sprag Race | Sonnax

4L80E 4L85E TH400 HD Intermediate Clutch Outer Sprag Race by Sonnax Part No. 34663HD-02 Improve GM 4L80-E, 4L85-E and TH400 transmission durability with Sonnax heavy duty intermediate clutch outer sprag race 34663HD-02. It’s an ideal upgrade...

TH400 Rear Planet | 1/2'' Parking Lug

HALF-INCH PARKING LUG 0.50''

TH400 Rear Planet | 1.5'' Parking Lug

TH400 4L80E Universal Intermediate Shaft Heavy Duty

TH400 4L80E Universal Intermediate Shaft Heavy Duty Made from MARAGING Steel which has a 20% stronger yield point than 300M. TCS has eliminated the common failure points of the OEM design by eliminating the undercuts behind the ring gear and clutch hub...

4L80 TH400 Billet Steel Clutch Hub

4L80, TH400 Billet Steel Clutch HubFeatures include: Made from 4140 HTSR billet steel to eliminate spline failures in high horsepower applications. Two Torrington thrust bearings that replace the conventional thrust washers. Designed to be used in...

TH400 3L80 Intermediate Sprag Outer Race (1965-1998) 0.751'' Thick

TH400 3L80 Intermediate Sprag Outer Race (1965-1998) 0.751'' Thick  Good Used

TH400 Output Shaft | 8-1/8'' OAL | 32-Spline | 2-7/8'' Spline Length | 1-Clip Style Speedo Gear | w/ O-Ring Groove

TH400 Output Shaft  8-1/8'' Length from Base 32-Spline  2-7/8'' Spline Length  1-Clip Style Speedo Gear  w/ O-Ring Groove

TH400 Output Shaft | 7'' OAL | 32-Spline | 2-1/4'' Spline Length | Flat Top Style Yoke | Metal & Clip Style Speedo Gear | No O-Ring Groove

TH400 Output Shaft  7'' Length from Base 32-Spline  2-1/4'' Spline Length  Flat Top Style Yoke  Metal & Clip Style Speedo Gear  No O-Ring Groove

TH400 Output Shaft | 18-1/2'' LG | 32-Spline | No Yoke Thread | Metal & Clip Style Speedo Gear | O-Ring Groove

TH400 Output Shaft | 18-1/2'' LG | 32-Spline | No Yoke Thread | Metal & Clip Style Speedo Gear | O-Ring Groove | Used in 71-76 Cadillac Deville/Fleetwood

TH400 Forward Direct Clutch Cast Alum. Piston - 8623709

TH400 Forward Direct Clutch Cast Alum. Piston - 8623709

TH400 Early 4L80E Intermediate Piston - Aluminium

Aluminium style intermediate clutch piston for GM's Turbo 400 and early 4L80E automatic transmissions.  

TH400 Speedo Housing (Fits 34-39 Tooth Gears)

This is a good used speedometer housing that fits 34-39 tooth gears for Turbo 400 automatic transmissions.

TH400 4L80E Intermediate Piston - Alum

This is a good used intermediate piston for TH400 and early 4L80E transmissions.

4L80E TH400 (1962-1992) Front Planet w/ 4-Pinions & .710"Slant Gear (1991-1995)

This is a good used front planet assembly with four pinions with .710" slant gears for early 4L80E automatic transmissions from 1991 to 1995.