The majority of 1998 Ford F-150 trucks with the common automatic transmission use Ford Mercon automatic transmission fluid. Some configurations may specify Dexron III or Mercon V, so you should verify on the dipstick or in the owner's manual.
The 1998 F-150 was offered with multiple drivetrain configurations, and the exact ATF specification depends on the specific transmission code installed in your truck. Ford’s service literature typically lists Mercon as the standard fluid for many 1990s Ford automatics, with Mercon V and Dexron III appearing for certain configurations or service updates. Using the incorrect fluid can affect shifting performance and transmission longevity, so always confirm the correct specification before a fill or flush.
Identifying your transmission and its fluid specification
To determine the correct fluid for your truck, identify the transmission code and check the dipstick label or the factory manual. The code will indicate the exact ATF specification required.
Where to find the transmission code
Look on the vehicle build sticker, in the service manual, or on the transmission itself. The code or tag will point to the proper ATF specification.
Common ATF specifications for the 1998 F-150
The following ATF fluids appear in the 1998 F-150’s service literature, depending on the exact transmission installed. The list is not exhaustive; always verify with your vehicle’s manual/dipstick.
- Mercon — Ford’s standard automatic transmission fluid for many 1990s Ford automatics.
- Dexron III — a specification seen in some earlier or mixed-fill configurations; not always the recommended default for newer Ford units.
- Mercon V — Ford’s newer specification introduced in the late 1990s and used in many later 4R-series transmissions; confirm compatibility with your specific unit.
The actual required fluid depends on your transmission code. Always verify before a fill or flush to avoid damage or shifting issues.
Manual transmissions in the 1998 F-150
If your 1998 F-150 has a manual transmission, it does not use ATF. It typically requires a GL-4 gear oil, commonly 75W-90, as specified in the owner's manual. Always check the manual or the neck tag on the transmission for the exact oil type and capacity.
Practical tips for changing transmission fluid
Before performing a fluid change, warm the transmission, use the proper drain and fill procedures, and avoid mixing fluids with different specifications. If you’re unsure about which fluid to use, consult the dealer or a qualified shop and reference the VIN-specific manual.
Summary
In short, many 1998 Ford F-150s with automatic transmissions use Mercon ATF, with Mercon V or Dexron III appearing in certain configurations. Verify the exact specification by checking the dipstick label or the owner’s manual, and use the correct type for your transmission code. If in doubt, seek guidance from a dealer or experienced technician to prevent shifting problems or damage.
Which F-150 engine is the most reliable?
5.0L V8 engine
The 5.0L V8 engine stands out as one of the most reliable options across multiple model years. This naturally aspirated engine offers good power, reasonable fuel economy, and straightforward maintenance. The 3.5L EcoBoost V6 provides excellent performance and towing capability, especially in 2017 and newer models.
How much transmission fluid does a 1998 Ford F150 take?
For Automatic Transmission: 4R70W....MA5
| Capacity: | 4 speed 4R70W Total Fill 13.9 quarts. |
|---|---|
| Capacity: | 5 quarts Initial Fill. |
Can an ATF 4 be used in a Ford?
Mobil ATF+4 is not recommended for vehicles that require Ford Mercon® or General Motors Dexron® type fluids. Automatic transmissions should be checked for proper fluid levels at regular intervals, and the fluid should be changed at manufacturer-recommended intervals.
What transmission fluid does a Ford F-150 take?
FRAM – Dexron III / Mercon Multi-Vehicle Automatic Transmission Fluid: 1 Quart (Part No. F420)