PRODUCT DESCRIPTION
The ATP Z-128 Automatic Transmission Flex Plate is engineered as a durable, OE-style replacement for a wide range of GM trucks, vans, and passenger vehicles. Designed for applications requiring a 168-tooth ring gear and 14.125" outside diameter, this flex plate provides precise starter engagement, reliable torque transfer, and correct external balance where required. Built to meet the demands of both light-duty and heavy-duty GM powertrains from the 1970s through the 1990s.
FEATURES
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OE-DESIGNED FITMENT – Matches original GM dimensions, bolt pattern, and tooth count for seamless installation.
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168-TOOTH RING GEAR – Ensures proper starter engagement for the many GM V8 platforms that use the larger flex plate.
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DURABLE CONSTRUCTION – Manufactured to withstand high rotational forces, heat cycles, and long-term drivetrain stress.
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EXTERNAL BALANCE SUPPORT – Includes proper added weight for engines requiring externally balanced configurations.
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HIGH COMPATIBILITY RANGE – Fits a large array of GM RWD trucks, vans, SUVs, and classic muscle models.
VEHICLE FITMENT
GMC
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P35/P3500 Van (1973–1974)
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K35/K3500 Pickup (1974)
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K25/K2500 Pickup (1974)
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Jimmy (1973)
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C35/C3500 Pickup (1973–1974)
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C25/C2500 Suburban (1973–1974)
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C25/C2500 Pickup (1973–1974)
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C15/C1500 Suburban (1973–1974)
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C15/C1500 Pickup (1973–1974)
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V3500 (1987–1990)
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R3500 (1987–1990)
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R2500 Suburban (1987–1990)
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R2500 (1987–1989)
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P3500 (1979–1990)
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P35 (1975–1976, 1978)
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P1500 (1979)
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K3500 (1979–1986, 1988–1990)
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K25 Suburban (1977)
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K25 (1976–1978)
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K1500 (1980)
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K15 (1976)
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G3500 (1989–1990)
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G35 (1976)
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G25 (1975–1976)
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C3500 (1979–1986, 1988–1990)
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C35 (1975–1978)
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C2500 Suburban (1979–1986)
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C25 Suburban (1975–1978)
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C2500 (1979–1986)
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C25 (1975–1978)
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C1500 Suburban (1979–1980)
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C15 Suburban (1975–1978)
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C1500 (1979–1980)
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C15 (1975–1978)
Chevrolet
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P30 Van (1973–1974)
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P20 Van (1973)
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P10 Van (1973)
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K30 Pickup (1974; also 1977, 1980–1986 in expanded listings)
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K20 Pickup (1974; also 1976–1978 later)
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K10 Pickup (1974; also 1976, 1980)
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G30 Van (1973–1974; also 1975–1976, 1988–1990)
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G20 Van (1973–1974; also 1976)
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G10 Van (1973–1974; also 1975–1980)
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C30 Pickup (1973–1974; also 1975–1986)
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C20 Pickup (1973–1974; also 1975–1986)
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C10 Pickup (1973–1974; also 1975–1980)
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Blazer (1973)
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V3500 (1989–1990)
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V30 (1987–1988)
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V2500 Suburban (1990)
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V20 Suburban (1987–1988)
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R3500 (1989–1990)
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R30 (1987–1988)
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R2500 Suburban (1989–1990)
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R2500 (1989)
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R20 Suburban (1987–1988)
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R20 (1987–1988)
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P30 (1975–1986, 1988–1990)
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P20 (1976, 1979)
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K3500 (1988–1990)
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K30 (1977, 1980–1986)
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K20 Suburban (1985)
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K20 (1976–1978)
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K10 (1976, 1980)
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G30 (1975–1976, 1988–1990)
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G20 (1976)
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El Camino (1970–1975)
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C3500 (1988–1990)
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C30 (1975–1986)
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C20 Suburban (1973–1986)
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C20 (1975–1986)
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C1500 (1990)
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C10 Suburban (1973–1980)
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C10 (1975–1980)
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K5 Blazer (1976–1978)
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Estate (1970)
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Townsman (1972)
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Kingswood (1970)
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Corvette (1970–1971)
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Chevelle (1970–1973)
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Brookwood (1971)
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Biscayne (1970–1971)
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Monte Carlo (1970–1975)
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Malibu (1973–1975)
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Laguna (1973–1975)
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Impala (1970–1976)
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Caprice (1970–1976)
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Bel Air (1971–1975)
PRODUCT ATTRIBUTES
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Linecode: ATP4
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Pitch Flywheels: 12 to 14
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Weight Added: Yes
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Diameter (in): 1.177
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Diameter (mm): 358.775
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Safety Rating: N/A
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SFI Approved: No
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SFI Certification Sticker Included: No
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Teeth: 168
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Inside Diameter: 2.483 in
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Outside Diameter: 14.125 in
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Tooth Quantity: 168
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Mounting Hole Diameter: 11.5 in
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Country of Origin (Primary): MX
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HTS / Tariff Code: 8483506000
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UPC: 00740993023050
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VMRS Code: 045004008
INSTALLATION & NOTES
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Designed for GM applications requiring a 168-tooth, large-diameter flex plate.
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Ensure compatibility with starter motor type (straight vs. staggered bolt pattern).
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Confirm external balance requirements before installation.
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Inspect torque converter bolt holes and alignment before tightening.
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Not SFI-rated—intended for street and general-duty applications.
