Maserati Ghibli & Quattroporte Automatic Transmission Oil Pan Filter Kit 673003178

Complete Automatic Transmission Sump & Filter Assembly – 673003178

Service the Maserati automatic gearbox with a complete transmission oil pan and integrated filter assembly, reference 673003178. The molded sump combines the transmission-fluid reservoir, filter section and sealing flange into one service unit, making it the key replacement component during a full gearbox fluid service.

Materials & Construction

The pan uses a rigid high-temperature engineering polymer body with external cooling ribs, reinforced bolt bosses and an integrated internal filtration section. The ribbed outer surface adds structural stiffness while increasing surface area around the fluid sump. Precisely formed mounting holes follow the gearbox flange perimeter for even clamping and sealing.

Function

• Stores the automatic transmission fluid beneath the gearbox valve body.
• Filters circulating fluid before it returns through the transmission hydraulic system.
• Supports clean fluid flow and consistent hydraulic pressure.
• Replaces an aged, leaking or damaged sump/filter assembly during gearbox maintenance.

Part Reference & Fitment

Reference Number: 673003178
Supersedes: 673002037

Applications: selected Maserati Ghibli 2014 onward and Maserati Quattroporte M156 2014 onward automatic-transmission applications.

Match part number 673003178, sump shape and gearbox configuration before installation.

How to Replace

1. Raise and level the vehicle securely so the transmission can be serviced at the correct fill angle.
2. Allow the gearbox to cool to the service temperature specified for fluid draining.
3. Drain the old transmission fluid through the service plug.
4. Remove the sump bolts gradually and lower the original pan carefully.
5. Clean the gearbox mating surface and remove old fluid residue without damaging the sealing face.
6. Install the replacement sump/filter assembly and tighten the bolts in an even cross-pattern to the specified torque.
7. Refill with the correct transmission fluid through the designated fill point.
8. Cycle the transmission through the gear positions and set the final fluid level at the specified gearbox-fluid temperature.
9. Inspect the sump perimeter and service plugs for leaks.

Why the Filter Matters

Automatic transmissions rely on clean hydraulic fluid to operate clutches, valves and pressure-control systems. Replacing the integrated filter during fluid service removes accumulated wear particles and gives the fresh transmission fluid a clean filtration path from the start.

FAQ

What is part number 673003178?
It is the Maserati reference for the automatic transmission oil sump and integrated gearbox filter assembly used on selected Ghibli and Quattroporte M156 models.

Does it replace 673002037?
Yes. 673003178 supersedes the earlier 673002037 reference for applicable vehicles.

Is the filter built into the pan?
Yes. The sump is supplied as an integrated pan-and-filter service assembly.

Should transmission fluid be replaced at the same time?
Yes. A new sump/filter is installed as part of a transmission-fluid service and should be filled with the correct specification of fresh gearbox fluid.

Is professional installation recommended?
Yes. Correct fluid temperature, fill level and tightening sequence are essential for automatic transmission service.