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TH400 Transmission Rebuild - Trans-Former

By Michael Galimi, Photography by Michael Galimi
Th400 Transmission Build Disassemble Parts
  • Th400 Transmission Build Front Pump Gears
    The front pump is oiled and resealed before being installed back in the case.
  • Th400 Transmission Build Install Case
  • Th400 Transmission Build Pressure Regulator Gear
    The pressure regulator spring, which increases line pressure for firmer shifts, is located inside the front pump and is replaced. It is included in a shift-kit.
    Th400 Transmission Build Pressure Regulator Gear
    The pressure regulator spring, which increases line pressure for firmer shifts, is located
  • Th400 Transmission Build Separator Plate
    A new separator plate and valvebody gasket is installed. The separator plate features larger holes, which provides firmer and more positive shifts.
    Th400 Transmission Build Separator Plate
    A new separator plate and valvebody gasket is installed. The separator plate features larg
  • Th400 Transmission Build Kick Down Solenoid
    Here is the kick-down solenoid, which requires a power supply to kick down the transmission. Some people leave the power off this solenoid and manually shift the transmission.
    Th400 Transmission Build Kick Down Solenoid
    Here is the kick-down solenoid, which requires a power supply to kick down the transmissio
  • Th400 Transmission Build Stock Valvebody
    The stock valvebody is bolted back on. The firmer shifts are accomplished through the addition of a PA shift kit and the replacement spring in the front pump.
    Th400 Transmission Build Stock Valvebody
    The stock valvebody is bolted back on. The firmer shifts are accomplished through the addi
  • Th400 Transmission Build Trans Filter
    A new trans filter is bolted on top of the valvebody, before the new PA pan is bolted on.
  • Th400 Transmission Build Install Governor
    Here is the governor being reinstalled, which regulates the automatic shifting.
  • Th400 Transmission Build Modulator Valve
    Nusser reinstalls the modulator valve, which runs off engine vacuum. When under no vacuum and high load (WOT), it delays the shift to a higher rpm.
    Th400 Transmission Build Modulator Valve
    Nusser reinstalls the modulator valve, which runs off engine vacuum. When under no vacuum
  • Th400 Transmission Build Vacuum Hook Up
    This is vacuum hook-up for the modulator valve.
  • Th400 Transmission Build Finished Tranny Look
    Once the transmission is completed, Nusser sprays the outside surface black. The transmission is then transferred PA’s in-house trans dyno test stand. Every transmission is tested on the stand to ensure it shifts properly and doesn’t have any leaks. Once it checks out, the transmission is moved over to the shipping department and sent on its way to the new owner.
    Th400 Transmission Build Finished Tranny Look
    Once the transmission is completed, Nusser sprays the outside surface black. The transmiss
SOURCES
Performance Automatic
8174 Beechcraft Ave.
Gaithersburg
MD  20879
240-439-4650
http://www.performanceautomatic.
com
By Michael Galimi
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