TH180 [89-UP] Automatic Transmission Modulator (1 Purple Stripe)

When the modulator is the confirmed cause of soft, harsh, or erratic shifts in a 4L30E or TH180 automatic transmission, replacing it with the correct adjustable unit gets the shift feel back where it needs to be without unnecessary parts. This is a single purple-stripe modulator, part number 180180C, adjustable design, covering applications from 1989 forward.

The adjustable feature matters in the field because it gives the technician the ability to dial in shift points to match vehicle load and engine vacuum conditions rather than accepting a fixed calibration. The single purple stripe is a stock identification mark that distinguishes this modulator from other calibrations used in the same transmission family, so confirm the stripe color matches what was installed before placing the order.

This listing contains one part and one part only. There are no seals, no Automatic Transmission Filter, no clutch discs, no steels, and no hardware packed with it. If the repair also calls for those components, they need to be sourced separately. The shipping weight is approximately 1 lb.

REMCO has been working in automatic transmissions since 1991. Each order is assembled individually and checked against its part listing before it ships, and a packing list is included in the box so the contents can be verified on arrival.

Before ordering, look at the transmission identification tag or case casting to confirm the unit is a 4L30E or TH180 and that the model year is 1989 or later. Ordering the wrong modulator calibration is the most common mistake on this part, and the purple stripe is the fastest way to cross-check.

• One adjustable vacuum modulator with a single purple stripe ships ready to install, covering 4L30E and TH180 automatic transmission applications from 1989 forward.
• This listing is a single modulator only. No additional seals, Automatic Transmission Filters, clutch packs, steels, or hardware are included. Verify this is the only part you need before ordering.
• The adjustable design allows shift point fine-tuning without replacing the entire unit, making it a practical choice when the existing modulator is the confirmed root cause of shift complaints.
• Contents: 1 adjustable modulator, purple stripe, approximately 1 lb shipped. The part number for reference is 180180C. No other components are packed in the box.
• Before ordering, confirm the transmission code on the unit is 4L30E or TH180 and that the application date falls within the 1989-and-later range. A misidentified unit is the most common reason for returns.

What's in the box

• 1 x Vacuum Modulator, TH180 [1 Purple Stripe] [Adjustable]

Compatible vehicles

• Fits Tracker [89-99], SLX [96-99], 318i/is/ti [91-99], 323i/is [97-09], 325e/es/is [89-95], 325ic/ix [89-93], 328i [96-99], 525i/it/xi [91-07], 528e/i [89-99], 535i [89-93], Z3 [96-02].