Dodge DM350 Transmission Filter Kit Guide for 1989-1992 Models
Keep your heavy-duty Dodge shifting smoothly by maintaining its automatic transmission filter.
- First, identify your transmission: it's either the 3-speed A727 or the 4-speed A518 (46RH).
- The correct aftermarket Wix filter kit for both transmissions is part number 58707.
- Symptoms of a clogged filter include harsh shifting, whining noises, and gear slippage.
- To minimize mess during a DIY change, use a pump to remove fluid through the dipstick tube before dropping the pan.
Know Your Transmission: A727 or A518?
Before you buy a transmission filter kit for your 1989-1992 Dodge DM350, you must know which automatic transmission is in your truck. Dodge used two main types during this period, and the filter is the same for both, but it's good to know what you have.
- Torqueflite A727 (3-Speed): This heavy-duty 3-speed automatic was common in trucks from 1989 to mid-1991. It is known for its durability but has no overdrive gear.
- A518 / 46RH (4-Speed): Starting in mid-1991, Dodge introduced this 4-speed automatic, which is basically an A727 with an added overdrive gear for better fuel economy on the highway. If your gear selector shows an "OD" or you feel a distinct fourth gear engage at cruising speed, you have the A518.
Pro Tip: Both the A727 and the A518/46RH used in this year range typically use the same filter kit, making ordering easier. The correct Wix aftermarket kit is part number 58707.
Symptoms of a Clogged Transmission Filter
A clogged filter starves the transmission of fluid, leading to serious problems. If you notice any of these signs, it's time to inspect your fluid and filter.
Choosing the Right Aftermarket Kit
For these older Dodge trucks, the quality of aftermarket parts is often as good as, or even better than, original equipment that is now over 30 years old. When it comes to transmission filter kits, you have good options.
| Brand Tier | Brand(s) | Quality & Notes |
|---|---|---|
| Trusted Aftermarket | Wix | Wix is a well-regarded brand for all types of filters. Their kits, like the Wix 58707, are known to be reliable and are a popular choice for DIY mechanics and professionals. The kit includes the filter and necessary gaskets. |
| OEM Alternative | Mopar | While you can still find OEM Mopar parts, a quality aftermarket brand like Wix provides excellent performance for this specific application. Some owners prefer using a reusable Mopar pan gasket, which can be purchased separately from the dealer, to prevent leaks that sometimes occur with cork gaskets. |
Known Issues, TSBs & Recalls
While there are no specific recalls for the transmission filter kit, there is a relevant Technical Service Bulletin (TSB) for 1989 models.
- TSB 07-01-89: This bulletin addresses an issue where the auxiliary transmission oil cooler can freeze in temperatures of -10°F or colder. This blockage can cause the transmission to overheat and push fluid out of the dipstick tube. While not a filter issue, it's a critical piece of knowledge for owners in cold climates.
Frequently Asked Questions
How often should I change my transmission filter?
For a heavy-duty truck like the DM350, especially if you tow or haul, a good interval is every 30,000 miles or every two years. If you notice any symptoms of a clogged filter, you should change it immediately, regardless of mileage.
What type of transmission fluid should I use?
For the A727 and A518/46RH transmissions, the recommended fluid is typically ATF+4. Always check your owner's manual or a service guide to confirm the correct fluid and capacity for your truck. Using the wrong fluid can cause serious damage.
Is it hard to change the transmission filter myself?
No, it's a straightforward job that a DIY mechanic can do. The main challenge is the mess. The job involves removing the 14 bolts on the transmission pan, swapping the filter, cleaning the pan and magnet, and reinstalling with a new gasket. The filter itself is held on by three T25 Torx screws.
What's the best way to avoid a huge mess?
Many owners recommend using a small fluid transfer pump to suck the old fluid out through the dipstick tube before you drop the pan. This can remove most of the fluid, leaving only a small amount to spill when the pan is lowered. Alternatively, loosen the bolts on one side of the pan more than the other to allow it to tilt and drain from a corner into your drain pan.
Should I use the cork gasket in the kit or something else?
The Wix kit often comes with a cork gasket. While it works, some mechanics and owners report that cork gaskets can weep or leak over time if not installed perfectly. For a better seal, consider buying a reusable rubber gasket from a Mopar dealer. If you use the cork gasket, be careful not to overtighten the pan bolts, as this can cause it to split.
Technical Specifications
OEM Part Numbers: 3515996
Fits both Torqueflite A727 (3-speed) and A518/46RH (4-speed) automatic transmissions used in this vehicle range. Kit includes filter and pan gasket.
We Have This Part in Stock
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.
- Dodge DM350: