ATP JK1

ATP part number JK1 is a shift improvement kit in the Transmission-Automatic system. This catalog matches it to 8 year-and-engine configurations from 1969 to 1982.

Verified fitment includes 1982 Checker Marathon 5.7L 350cid V8 DIESEL ; 1978 Bentley Corniche 6.8L V8 ; 1977 Bentley Corniche 6.8L V8 ; 1976 Checker Marathon 4.1L 250cid L6 ; 1975 Checker Marathon 4.1L 250cid L6 , plus 3 other configurations. See every vehicle this part fits.

Manufacturer specifications
Contains Heavy Duty Upgraded (from OE) SpringsMay Contain Spacer Plates, Spool Valves & Gaskets Depending on Revision of OE
Improver Kit
Application data published for:
🇺🇸 US 🇨🇦 CA

Frequently Asked Questions

What is ATP JK1?

ATP part number JK1 is a shift improvement kit with published application data for 8 vehicle configurations from 1969 to 1982. Use the manufacturer part number to cross-reference your old part or a repair quote before you order.

Which vehicles does ATP JK1 fit?

This catalog matches JK1 to 8 year-and-engine configurations from 1969 to 1982. Open the compatible-vehicles list for every make, model and engine, and read the notes for position or trim qualifiers.

Is ATP JK1 OEM or aftermarket?

What matters is the published application data for this part number, not the label on the box. ATP JK1 is listed with its manufacturer part number so you can compare it to an OEM number or another brand that covers the same fitment.

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