ATP Parts JX-67 Automatic Transmission Modulator Valve

ATP Parts JX-67 Automatic Transmission Modulator Valve

Restore proper transmission vacuum modulation with the ATP Parts JX-67 automatic transmission modulator valve. This OE-style replacement is built for exact-fit service and is specified for applications that require a 1 red stripe, a 2.959-inch overall length, and a single hose connection.

Compatible With select 1984-1990 Cadillac, Chevrolet, and GMC vehicles, including Chevrolet C10, K10, P30, and GMC Jimmy applications with matching transmission and ratio requirements.

Key Features

• Part number: JX-67
• Overall length: 2.959 inches
• Single hose connection
• Identified by 1 red stripe
• Adjustable range: 12.5-18
• Built as an exact-fit replacement from ATP Transmission Components
• Cross-reference: Dorman - HELP 14658

Detailed Description

The ATP Parts JX-67 is an automatic transmission modulator valve used in vacuum-modulated transmission systems where the valve’s stripe code, length, and adjustment range must match the vehicle application. It is listed for a wide range of rear-wheel-drive Cadillac, Chevrolet, and GMC trucks, vans, and passenger vehicles from 1984 through 1990, including Chevrolet C1500, K1500, C10 Suburban, and GMC K2500 Suburban models. Fitment notes also call out specific transmission requirements such as THM350C, 3L80, THM425, and THM475/M40 on certain applications.

This part cross-references Dorman - HELP 14658 for the same application. The JX-67 is also associated with multiple interchange numbers used across the aftermarket, making it a practical replacement when matching the original modulator valve specification is critical. For search relevance, this part is commonly referenced for Chevrolet C10 transmission modulator valve replacement, GMC Jimmy automatic transmission modulator valve service, and Cadillac Brougham vacuum modulator fitment.

What It Helps Address

• Harsh or delayed shifting caused by a worn modulator valve
• Incorrect shift timing from a leaking or out-of-spec vacuum modulator
• Transmission performance issues when the original red-stripe code no longer matches
• Fitment problems on vehicles requiring the 2.959-inch length specification
• Service replacement needs on older GM automatic transmission applications

Installation Notes and Tips

Verify the stripe code, overall length, hose connection count, and adjustment range before installation. Confirm the transmission family and vehicle application against the fitment notes, especially on models that list specific exclusions such as w/o EGR or only fits certain transmission codes. Use the vehicle’s original modulator specification as the final reference when matching this part number.

Quality Assurance

ATP Transmission Components are positioned as exact-fit replacement parts with no compromise on application matching. The JX-67 follows that approach by aligning the physical dimensions and identification marks required for listed GM applications.