C4 [73-UP] Automatic Transmission Modulator Single Yellow Stripe (Push in)

When an automatic transmission shifts unpredictably or hunts between gears under light throttle, the vacuum modulator is one of the first components to suspect, and this push-in single yellow stripe modulator addresses that failure point directly for C4 and C5 units built between 1973 and 1983. What sets this part apart from a generic modulator is the retention style and calibration stripe: the push-in design seats into the case without a threaded body, and the single yellow stripe identifies a specific vacuum response curve that must be matched to the stock specification.

This is an individual replacement piece, not a kit. There are no gaskets, seals, or additional hardware in the package. The part ships as one unit weighing 1 lb, and the listing is intentionally limited to this single modulator so the buyer is not paying for components already on hand or available elsewhere.

REMCO has worked in automatic transmission parts since 1991. Each order is assembled and checked against its part record before it leaves. The box includes a piece list so the technician can confirm receipt at the bench before the job starts.

Before placing the order, verify three things: that the transmission is a C4 or C5, that the modulator port is the push-in type and not a threaded style, and that the build year of the unit is within the 1973-1983 application range. Ordering the wrong retention style or the wrong stripe calibration will require a return, so cross-reference the stock part or the unit tag before purchasing.

• A failing vacuum modulator causes erratic shift points and slipping; replacing this push-in single yellow stripe unit restores consistent shift behavior without invasive repairs.
• This listing covers the modulator only. No gaskets, seals, Automatic Transmission Filter, bands, or other components are included. Verify exactly what your rebuild requires before ordering.
• The push-in retention design on this modulator is specific to C4 and C5 applications from this era; using the wrong style can result in vacuum leaks or an unsecured fit that affects shift feel directly.
• Single piece: one vacuum modulator, push-in style, single yellow stripe identification. Article weight is 1 lb. No additional hardware is packed with this unit.
• Before ordering, confirm your unit is a C4 or C5 with a push-in modulator port and that the build year falls within the 1973-1983 range. Stripe color indicates calibration: match it exactly.

What's in the box

• 1 x Vacuum Modulator, C4 Single Yellow Stripe [Push In] 83

Compatible vehicles

• Fits Fairmont [78-80], Galaxie 500 [73-74], Gran Torino [73-76], Granada [75-80], LTD [75-80], Maverick [73-77].