ATP Parts SK-1 Automatic Transmission Shift Kit

Automatic Transmission Shift Kit for GM Applications

ATP Parts SK-1 is an automatic transmission shift kit for select GM cars, trucks, vans, and SUVs from 1979-1986. It is built as an exact-fit replacement part for service work on transmissions that need firmer, more consistent shifting response.

This kit is commonly searched as an improver kit for Chevrolet C10, GMC C1500, and Buick Regal applications, with coverage that also extends to many THM250C, THM350, and THM350C-equipped vehicles.

Key Features

• Automatic transmission shift kit for service and rebuild applications
• Exact-fit replacement from ATP Parts
• Fits a broad range of 1979-1986 Chevrolet, GMC, Buick, Oldsmobile, Cadillac, and Pontiac vehicles
• Application coverage includes many THM250C/M31, THM350, THM350C, and THM350C-specific vehicles
• Cross-references Pioneer Automotive Industries 765007 for the same application
• Part number SK-1 for catalog and fitment lookup

Detailed Description

ATP Parts SK-1 is a transmission service kit intended for automatic transmission repair on a wide range of rear-wheel-drive GM platforms. The fitment list includes Chevrolet C10, C20, C30, K10, K20, K30, Camaro, Corvette, Monte Carlo, Caprice, El Camino, Impala, Malibu, and Nova, along with GMC C1500, C2500, C3500, Jimmy, and K-series trucks. It also covers Buick Regal and LeSabre, Oldsmobile Cutlass, Delta 88, 98, and Cadillac DeVille and Fleetwood applications where the listed transmission codes apply.

ATP Transmission Components are positioned as exact-fit replacement parts, giving technicians and rebuilders a direct-match option for transmission service. If you are sourcing an automatic transmission shift kit for a 1979-1986 Chevrolet C10, GMC C1500, or Buick Regal, SK-1 is a cataloged match for the listed vehicles and transmission families.

What It Is Used For

• Restoring shift quality in worn automatic transmissions
• Addressing delayed, soft, or inconsistent gear changes
• Supporting transmission service on THM250C, THM350, and THM350C applications
• Replacing a missing or incorrect improver kit during rebuild work
• Matching a listed service kit for GM truck and passenger car platforms

Installation Notes and Tips

Verify the transmission model before ordering, especially on vehicles with notes calling out THM350C or THM250C/M31 coverage. Confirm the year, make, and model against the fitment list, since several vehicles share similar names but use different transmissions. For best results, compare the existing unit and service documentation before installation.

Quality Assurance

ATP Parts markets its transmission components as exact-fit replacement parts, built for direct application matching in service and rebuild work. Part number SK-1 is cataloged for the listed GM fitments and cross-references Pioneer Automotive Industries 765007, helping simplify part lookup and verification.