Vacuum Modulator Kit
Fits 1991-13 4L80E, 4L85E
Does not fit diesel Transmission Removal Not Required

SKU: 48-MOD Category:
  1. Distributor Part Numbers
    TransGo 48-MOD
    A & Reds K34908M
    Capital Core NA
    MST 48-MOD
    Natpro K33879V
    OTS 48-MOD
    PDQ TG-48-MOD
    PNH TG34431E
    PTW K33879V
    Summit NA
    Transtar A34431E
    WIT A34431E
  2. Documents
  3. General Details
    Great for transplants! Provides a more aggressive and tunable pressure boost curve with engine vacuum instead of vehicle PCM controlling PCS/EPC Solenoid. Note: This kit does not eliminate the need for TCM shift controls.

    This TransGo 48-MOD kit fits 1991 to 2013 General Motors vehicles equipped with the 4L80E and 4L85E automatic transmission with gas engines only. High-performance applications often require an alternate source for line pressure regulation because the vehicle is equipped with a non-reprogrammable electronic control module. This kit makes a nice alternative for a more reliable and tunable pressure control system.

    Features and benefits:

    This TransGo internal modulator kit provides tunable line pressure regulation with a vacuum modulator instead of the vehicle PCM controlling the EPC solenoid. The kit includes everything needed to add the internal modulator system with the oil pan off the transmission. From the outside of the transmission you will need to connect it to an intake manifold vacuum source, however hardware is not provided for this. In addition, it comes with an oil pan based resistor to pacify the control module for the missing EPC solenoid in applications where the computer will still manage the gear changes.

    The kit requires the OE reusable pan gasket GM part # 8677743 for adequate clearance.

    • Pressure regulator valve spring and snap ring
    • Brass fitting
    • Vacuum modulator, pin, valve and bushing
    • Hold down bracket
    • Elbow vacuum hose and spring
    • (4) Short zip ties
    • (5) Long zip ties
    • Vacuum tee
    • Resistor