The Ford Explorer ST, with its potent 3.0L EcoBoost engine and 10R60 transmission, offers impressive performance straight from the factory. However, enthusiasts seeking enhanced durability and performance often turn to drivetrain modifications. This guide delves into key upgrades that bolster the Explorer ST’s drivetrain, ensuring it can handle increased power and rigorous driving conditions.
1. Oil System Enhancements
Oil Capacity Adjustment
Under hard launches, the Explorer ST may experience oil pressure drops. A simple yet effective solution is to increase the oil fill to 6.5 quarts, aligning with Ford’s specification for the 2025 ST model. This adjustment helps maintain consistent oil pressure during aggressive driving.
Upgraded Oil Pan
FenFabrication offers an enlarged oil pan that not only increases oil capacity but also replaces the factory plastic pan with a more robust design. This upgrade aids in maintaining oil pressure stability during high-performance scenarios.
2. Transmission Reinforcements
Built Transmission
The stock 10R60 transmission, while capable, can become a weak link under increased power and frequent hard launches. RSA Transmissions provides a fortified version of this transmission, proven in high-performance applications, including 10-second quarter-mile Explorer STs.
Upgraded Flex Plate
Complementing a built transmission, an upgraded flex plate replaces the factory unit, offering enhanced strength and reliability, especially under high-torque conditions.
Transmission Mount Insert
FenFabrication’s transmission mount insert fills the voids in the stock mount, preventing collapse under stress. This modification results in improved drivetrain stability with minimal increase in noise, vibration, and harshness (NVH).
3. Driveshaft and Support Upgrades
JXB Driveshaft Carrier Upgrade
The factory driveshaft carrier utilizes soft rubber bushings that prioritize comfort over performance, potentially leading to driveline slop during wide-open throttle (WOT) conditions. JXB Performance offers a carrier with stiffer bushings, maintaining proper driveshaft alignment and reducing unwanted movement.
4. Differential and Subframe Enhancements
Differential Brace
In late 2021, some Explorer STs were equipped with a single-bolt rear subframe, originally designed for less powerful models. This configuration can lead to subframe movement and potential drivetrain damage under load. Installing a differential brace, such as those from ID-Speed, Livernois Motorsports, or DX, reinforces the subframe, mitigating these risks.
Rear Subframe Insert
JXB Performance’s rear subframe insert further stabilizes the subframe, reducing movement and enhancing overall drivetrain rigidity. While it doesn’t replace the need for a differential brace, it serves as a complementary upgrade.
Rear Differential Bolt Upgrade
To address potential bolt failures in the rear differential, upgraded bolts from manufacturers like Steeda, HSF, and Whoosh offer increased strength over the factory hardware, enhancing durability under stress.
5. Additional Drivetrain Considerations
Oil Catch Can
Installing an oil catch can helps prevent oil vapor from entering the intake system, maintaining engine cleanliness and performance. Regular maintenance, such as emptying the catch can every 5,000 miles, ensures optimal function.
Why Upgrading the Drivetrain Matters on The Explorer ST
Enhancing the drivetrain of the Ford Explorer ST involves a combination of strategic upgrades aimed at reinforcing key components. By addressing known weaknesses and potential failure points, these modifications contribute to a more robust and reliable performance vehicle. As always, it’s essential to consider the balance between performance gains and potential impacts on warranty and daily drivability.
