GM

TH425 Transmission

Browse all TH425 transmission parts here or use the filters below to find just what you are looking for.

Narrow Your Choices

HD/HP Parts Zip Valve™ Drop-in Parts

Symptoms

Area of Transmission

Part Type

Internal

Extreme Duty Forward Clutch Hub Kit

Extreme Duty Forward Clutch Hub Kit 34322-02K

Forward Clutch Hub Front Washer

Forward Clutch Hub Front Washer 34298-078

Forward Hub

Material: Steel
Thickness: 0.078"
Outer Dia.: 1.781"
Inner Dia.: 1.289"

Helps cure:

Excess front endplay

Heavy Duty Forward Clutch Hub

Heavy Duty Forward Clutch Hub 34322-01

Rear Unit Endplay Shim

Rear Unit Endplay Shim 34006-05

.005" Thick

Material: Steel
Inner Dia.: 2.375"
Thickness: 0.005"
Outer Dia.: 3.250"

Helps cure:

Excess rear endplay

Pump

Boost Valve Kit

Boost Valve Kit 34910-01K

O-Ring Style

Helps cure:

Low line rise
1-2 Soft
2-3 Soft
Delayed Reverse
Reverse shudder

Pressure Regulator Valve Kit

Pressure Regulator Valve Kit 34910-03K

Fits '71–later units.

Helps cure:

High & uncontrollable line pressure
Delayed converter charge
Poor Reverse engagement

Valve Body

Checkball 10000-08

Material: Imidized Plastic
Dia.: 0.250"

Helps cure:

Lost or damaged component

↑