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Sonnax 4L60E Transmission Heavy Duty 3-4 Clutch Backing Plate Kit 74140-01K

$ 58.02

Availability: 26 in stock
  • Fitment Type: Performance/Custom
  • Refund will be given as: Money back or replacement (buyer's choice)
  • Return shipping will be paid by: Seller
  • Warranty: Yes
  • Brand: Sonnax
  • Condition: New
  • Item must be returned within: 30 Days
  • Manufacturer Part Number: 74140-01K
  • Returns Accepted: Returns Accepted

    Description

    4L60, 4L60-E, 4L65-E, 4L70-E
    Heavy Duty 3-4 Clutch Backing Plate Kit
    Part No.
    74140-01K
    Requires ‘91-later 3-4 apply ring stamped with number “7”, measuring 3.671–3.682" in height.
    A thin, weak backing plate is the leading cause of 3-4 clutch distortion and burnup – a pervasive problem in listed GM transmissions. Even the thickest OE backing plate flexes during clutch apply, allowing heat to build up unevenly, causing problems in daily drivers and mid-level street/strip vehicles alike.
    Other aftermarket solutions typically employ a thinner backing plate, and thinner steels which ultimately exacerbate the problem.
    Sonnax heavy duty 3-4 clutch backing plate kit 74140-01K significantly reduces backing plate flex for increased 3-4 clutch durability. It features a significantly thicker and stiffer backing plate, used together with a thinner (yet stiffer) apply plate.
    Designed for use with GM high energy clutch pack with seven .067" frictions and six .095" steels, this kit can be used to upgrade OE 700-R4 and 4L60-E five-friction or six-friction clutch packs to seven frictions, or to improve stock, seven-friction clutch packs in 4L65-E and 4L70-E units by reducing backing plate flex.
    Backing plate is significantly thicker and stiffer than OE for added durability
    Drop-in, mid-level upgrade for daily drivers and mild street/strip applications
    Contents
    Backing Plate
    Apply Plate