Transmission Filter Kit Guide for the 2008-2012 Chinook Motor Coach Summit
Keep your Summit's automatic transmission shifting smoothly by understanding its unique dual-filter system.
- Your Chinook Summit is on a Ford E-450 chassis with a 5R110W transmission that requires two filters: one internal and one external.
- Service is recommended every 30,000 miles using only Mercon® SP fluid.
- Using OEM (Motorcraft) or premium aftermarket filters (Wix, NTZ) is strongly advised to protect your transmission.
- When changing the internal filter, ensure the old rubber seal is removed from inside the transmission case.
Understanding the Transmission Filter System in Your Chinook Summit
When shopping for a transmission filter kit for your 2008-2012 Chinook Summit, it's important to know that you are actually shopping for the underlying chassis: the Ford E-450 with a 5R110W TorqShift transmission. This heavy-duty transmission has a robust filtration system that uses two separate filters, both of which should be changed during a transmission service.
- Internal Pan Filter: This is a large, flat filter located inside the transmission oil pan. You must remove the pan to access it. Its job is to catch larger debris.
- External In-Line Filter: This is a canister-style filter located outside the transmission, often called the "toilet paper roll" filter due to its appearance. It provides finer filtration for fluid returning from the cooler.
Ford recommends changing the transmission fluid and both filters every 30,000 miles to ensure a long service life. Using the correct fluid, Mercon® SP, is mandatory as other fluid types can cause damage.
Symptoms of a Clogged Transmission Filter
A clogged filter restricts fluid flow, which can starve the transmission of the pressure it needs to operate correctly. Watch for these warning signs:
- Shifting Problems: You might feel harsh shifts, delayed engagement into gear, or slipping between gears.
- Unusual Noises: A whining or buzzing sound that changes with engine RPM can indicate a clogged filter is making the transmission pump work harder.
- Fluid Leaks: While not a direct symptom of a clogged filter, it's a reason to inspect the transmission. Low fluid levels can cause similar symptoms.
- Warning Light: The transmission warning light on your dashboard may illuminate if the computer detects a problem with pressures or shifting.
Choosing the Right Aftermarket Transmission Filter Kit
For this specific application, sticking close to the original equipment (OEM) quality is highly recommended by mechanics and experienced owners.
Tier 1: OEM & Premium Aftermarket
This is the safest choice for your transmission's health. These filters are designed to meet Ford's exact specifications for filtration efficiency and flow rate.
- Motorcraft: As the original Ford part, Motorcraft is the benchmark. The external filter is part number FT-145. These kits provide the best fit and performance, ensuring your transmission is protected.
- Wix / NAPA Gold: Wix is a well-respected filter manufacturer. Their products (like part 57702 for the external filter) are considered equivalent to OEM quality.
- NTZ: Some forum users have identified NTZ as the original manufacturer for Ford's Motorcraft FT-145 filter, suggesting it's the same part in a different box.
Tier 2: Standard Aftermarket
These brands offer a balance of cost and quality and are readily available. They are generally reliable for standard service intervals.
- Carquest Premium: A house brand for retailers like Advance Auto Parts, these kits are designed to meet OE fit and quality requirements.
- ATP: This is another established aftermarket brand that offers a replacement for the OEM filter.
A Note on Budget Brands
While budget-friendly options exist, the transmission is one of the most expensive components in your motorhome. The potential cost of a transmission repair far outweighs the savings from a lower-quality filter. It is strongly advised to use a reputable OEM or premium aftermarket brand for this part.
Estimated Costs for Transmission Filter Replacement
| Part Type | Estimated Part Cost |
|---|---|
| New OEM (Motorcraft) Kit | $60 - $110 |
| New Aftermarket Kit (Premium) | $40 - $70 |
| New Aftermarket Kit (Standard) | $25 - $45 |
| Shop Labor | $150 - $300 |
Cost estimates are approximate and can vary by region and supplier. Labor costs do not include the price of transmission fluid.
Frequently Asked Questions (FAQ)
Do I have to replace both filters?
Yes. For a complete service that meets Ford's recommendations, you should replace both the internal pan filter and the external in-line filter at the same time. Neglecting one can compromise the cleanliness of your transmission fluid.
Is the transmission pan gasket reusable?
Often, yes. The original Ford 5R110W gasket is a high-quality, steel-and-rubber gasket with built-in compression limiters. If it is not damaged, cracked, or brittle, it can be cleaned and reused. Many aftermarket kits come with a new cork or paper gasket, but the original Ford gasket is superior if it's in good condition.
What transmission fluid should I use?
You must use fluid that meets the Mercon® SP specification. Do not use Mercon® V, Dexron, or any other type of universal fluid. Using the wrong fluid can lead to poor shifting and transmission failure.
What is the most difficult part of the replacement?
The most common challenge is the seal for the internal pan filter getting stuck inside the transmission case when the old filter is removed. You must carefully remove this old seal with a pick or a hooked tool without scratching the metal bore inside the transmission.
Technical Specifications
OEM Part Numbers: FT-145 3C3Z-7B155-BA 8C3Z-7A098-D
Chassis: Ford E-450. Transmission: 5R110W 'TorqShift' 5-Speed Automatic. Required Fluid: Mercon® SP.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Chinook Motor Coach Summit: