Peterbilt 348 Transmission Filter Kit Guide: 1996-2000
The transmission filter kit for your truck is based on the transmission model, not the truck model, so identifying it is the first step.
- You must identify your specific transmission model (e.g., Allison 3000 series, Eaton Fuller RT-8709) by checking the data tag on the transmission housing before buying parts.
- Service procedures differ greatly between automatic and manual transmissions; automatics require filter kits while many manuals only need a fluid change.
- Symptoms like delayed shifting, whining noises, or slipping are serious warnings that your filter and fluid need immediate service to prevent major transmission damage.
- For this age of vehicle, a quality aftermarket kit from a brand like Wix, Baldwin, or Donaldson provides reliable performance and value.
Find the Right Kit by Finding Your Transmission
When you shop for a transmission filter kit for your 1996-2000 Peterbilt 348, you will find that parts are listed by the transmission manufacturer and model, not for the Peterbilt 348 itself. During this period, your truck could have been equipped from the factory with several different options, most commonly an automatic from Allison or a manual from Eaton Fuller. Before you can buy a kit, you must identify which transmission is in your truck.
Pro Tip: Look for a metal data tag on the side of your transmission housing. This tag contains the manufacturer (e.g., Allison, Eaton) and the model/serial number. You will need this information to order the correct filter kit.
If You Have an Allison Automatic Transmission
Allison transmissions are common in Peterbilt 348s configured for vocational use. These are complex hydraulic systems that rely on clean fluid. A typical aftermarket filter kit for an Allison will usually include:
- Two filters (a main cartridge filter and a lube/suction filter)
- Pan gasket
- Assorted O-rings for a complete service
Regularly changing the filters is critical to prevent the valve body and solenoids from getting clogged, which can cause shifting problems and lead to costly repairs.
If You Have an Eaton Fuller Manual Transmission
Many Peterbilt 348s were built with durable Eaton Fuller manual transmissions. Unlike automatics, many of these manual gearboxes do not have a traditional filter that is replaced during a service. Instead, they rely on a magnetic drain plug to capture metal shavings. Service simply involves draining the old fluid, cleaning the magnet, and refilling with new fluid. However, some Eaton models do have an external spin-on filter or a filter element that may be part of a cooler circuit, which would need to be replaced.
Choosing the Right Aftermarket Part
Since you are buying a part for the transmission itself, brand reputation in the heavy-duty industry matters more than vehicle-specific fitment. For Allison transmissions, several reputable aftermarket brands offer kits that meet or exceed OEM quality.
- Premium Aftermarket (Recommended): Brands like Wix, Baldwin, and Donaldson have a long history of making reliable filters for heavy-duty applications. They offer a good balance of quality and price for normal service intervals.
- Budget Aftermarket: Brands like ATP offer kits that are more affordable. While functional, pay close attention to the quality of the included gasket; a poor-quality gasket can cause leaks, which will lead to bigger problems down the road.
For Eaton Fuller transmissions with a filter, OEM or a direct cross-reference from a major filter brand is the safest choice.
No Recalls or TSBs Found for This Part
Our search of the NHTSA database and other public records found no safety recalls or technical service bulletins (TSBs) specifically related to the transmission filter kits for the 1996-2000 Peterbilt 348. Recent recalls for newer Peterbilt models exist for shifter communication issues but do not apply to this year range.
Aftermarket Transmission Filter Kit Cost: 1996-2000 Peterbilt 348
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Allison-style Kit (e.g., Wix, ATP) | $50 - $120 |
| New Aftermarket Eaton-style Filter Element | $30 - $70 |
| Shop Labor for Installation | $150 - $300 |
Frequently Asked Questions (FAQ)
How do I know if my transmission filter is clogged?
Symptoms of a clogged filter include delayed or harsh shifting, whining or buzzing noises from the transmission, a feeling of the truck slipping out of gear, or the transmission overheating.
Do I have to change the fluid when I change the filter?
Yes. It makes no sense to put clean filters in a transmission with old, dirty fluid. The filter change is part of a complete fluid service. The cost of new fluid is minor compared to the cost of a transmission repair.
How often should I change my transmission filter?
Follow the service interval recommended by the transmission manufacturer (Allison or Eaton), not Peterbilt. For trucks in severe service (city driving, vocational use), you should shorten the interval. A typical interval might be every 50,000 miles, but check your specific transmission's service manual.
Is an OEM filter better than an aftermarket one?
For a vehicle of this age, a quality aftermarket filter from a reputable brand like Wix or Baldwin offers comparable performance and protection to OEM for a lower price. The key is using a trusted brand, not just the cheapest option.
Technical Specifications
OEM Part Numbers: Allison 29548988 Allison 29540494 Eaton 4304827
Kit contents vary by transmission. Allison kits typically include two filters and O-rings. Eaton filters are often single cartridge elements. Always verify fitment using the transmission model number.
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.
- Peterbilt 348: