Hard Parts

TH400 4L80E HD Low/Revers Servo Piston (95-Earlier) by Sonnax

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 by Sonnax

TH400 Externally Adjustable Low/Reverse Servo Kit by Sonnax Externally Adjustable Low/Reverse Servo KitPart No. 34914-20K   Designed for GM TH400 racing transmissions, Sonnax externally adjustable low/reverse servo kit 34914-20K makes band...

4L80E 4L85E TH400 HD Intermediate Clutch Outer Sprag Race by 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.

TH400 Output Shaft - 4WD (5.25'' OL w/ 2.25'' Spline) Cast Governor Gear

This is a good used output shaft for four wheel drive TH400 automatic transmissions.  The overall length is 5-1/4'' long with 2-1/4'' splines. Cast Governor Gear Style

TH400 4L80E Intermediate Sprag w/ 34-Elements - HD Aftermarket

This is a high quality heavy duty Borg Warner 34-element intermediate sprag assembly for GM Turbo 400 and 4L80E automatic transmissions.

TH400 Forward Drum w/ Shaft

This is a good used forward drum with shaft for GM's Turbo 400 automatic transmissions.

TH400 Output Shaft | 15'' OAL | 32-Spline | 4" Spline | No Threads | Metal & Slip Speedo Style | No O-Ring Groove | BOP

TH400 Output Shaft | 15'' Length from Base 32-Spline  4" Spline Length No Threads  Metal & Slip Speedo Style  No O-Ring Groove  BOP