A Guide to Transmission Filter Kits for the 1964-1973 Buick Skylark
Keep your classic Skylark's automatic transmission shifting correctly by choosing the right filter kit.
- You must identify your transmission (ST-300, TH350, or TH400) by its pan shape before ordering a kit, as they are not interchangeable.
- Symptoms like shifting delays, whining noises, or fluid leaks are strong indicators that your transmission filter is clogged and needs service.
- For best results and fewer leaks, choose a premium brand like ACDelco or Wix, which are known for quality filter media and gaskets.
- Always replace the pan gasket included in the kit and clean the pan's magnet to remove metal shavings during the service.
Identifying Your Skylark's Transmission is the First Step
Before buying a transmission filter kit for your 1964-1973 Skylark, you must know which automatic transmission is in your car. The filter kits are not interchangeable. Using the wrong kit will lead to leaks and potential transmission damage. Identification is best done by looking at the shape of the transmission oil pan.
🎬 Watch: How to identify your specific GM transmission model- Super Turbine 300 (ST-300): Found in earlier models, typically from 1964 to 1969. This two-speed automatic has a distinct pear-shaped or bell-shaped pan.
- Turbo-Hydramatic 350 (TH350): A very common three-speed automatic used from approximately 1969 to 1973. Its pan is mostly square but has one corner cut off at an angle.
- Turbo-Hydramatic 400 (TH400): A heavy-duty three-speed, less common in standard Skylarks but may be found in high-performance GS models. Its pan has a more complex, irregular shape sometimes compared to the shape of Texas.
Symptoms of a Clogged Transmission Filter
A dirty and clogged filter starves the transmission of fluid, leading to serious problems. If you notice any of these signs, a filter and fluid change should be your first step in diagnosis.
🎬 See these common warning signs of a clogged filter- Delayed or Harsh Shifting: The car may hesitate for a few seconds when you shift from Park to Drive, or shifts may feel jerky.
- Transmission Slipping: You might feel the engine rev up, but the car doesn't speed up accordingly, as if it's momentarily in neutral.
- Whining or Buzzing Noises: A clogged filter can make the transmission pump work harder to circulate fluid, causing a whining sound that changes with engine speed.
- Fluid Leaks: Increased pressure from a blockage can force fluid out past gaskets, creating reddish puddles under your car.
- Burnt Smelling Fluid: Restricted flow causes the transmission to run hot, which can burn the fluid and give it a dark color and foul smell.
Choosing the Right Aftermarket Brand
For a classic car like the Skylark, aftermarket parts are the most common choice. Quality can vary, so it's important to know the reputation of different brands.
| Brand Tier | Brands | General Assessment |
|---|---|---|
| Premium Quality | ACDelco, Wix | Often considered OEM-equivalent or better. These brands are known for high-quality filter material and durable gaskets that provide a reliable seal. They are a trusted choice for longevity and performance. |
| Standard / Mid-Grade | ATP | ATP specializes in transmission parts and is a well-regarded aftermarket brand. They offer a good balance of quality and value, making them a solid choice for most owners. |
| Economy / Budget | Premium Guard, Pioneer Cable | These brands provide a functional and affordable option. While they meet basic requirements, the filter media and gasket materials may not be as robust as premium brands. They are suitable for budget-conscious repairs. |
Frequently Asked Questions (FAQ)
How often should I change the transmission filter?
For a classic vehicle like the 1964-1973 Skylark, a good rule of thumb is to change the fluid and filter every 30,000 miles or every two to four years, whichever comes first. If you notice any performance issues, it should be checked immediately.
What type of transmission fluid should I use?
Most GM transmissions from this era use DEXRON-type automatic transmission fluid. Early versions of DEXRON (like II or III) are appropriate. Always check the fluid specifications for your specific transmission to be sure, as using the wrong fluid can cause damage.
Is replacing a transmission filter a DIY job?
Yes, for those comfortable with working under a car. The process involves safely jacking up the vehicle, draining the fluid by loosening and dropping the transmission pan, replacing the filter, cleaning the pan and magnet, installing the new gasket, and reinstalling the pan before refilling with fluid. It is a messy job, so be prepared with a large drain pan and plenty of rags.
🎬 Watch: A step-by-step DIY transmission filter change walkthroughAre there any recalls for the transmission filter on my Skylark?
No. There are no specific NHTSA recalls for the transmission filter kit on the 1964-1973 Buick Skylark. Any issues you encounter will be due to normal wear and age, not a manufacturing defect.
Helpful Videos
Technical Specifications
Kit typically includes a filter (felt or paper media) and a pan gasket (cork, rubber, or fiber). The specific filter and gasket shape depends on the transmission model (Super Turbine 300, TH350, or TH400).
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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.