Interesting read from TFL car
Here's what people are saying about the 2021 Toyota 4Runner update/replacement:
Tacoma parts: It may get the same V6 that's currently available in the Toyota Tacoma which is a 3.5-liter V6 that makes 278 horsepower and 265 lb-ft of torque. That has the potential of including the same six-speed automatic that's currently being used in the Tacoma as well.
Straight six engines: With Toyota/Lexus new interest in straight six cylinder engines (like the 335 horsepower and 365 pound-feet of torque unit in the new Supra), there is a chance that they might consider one for the 4Runner. It's not that likely in my estimation (given its BMW origins), but you never know.
New platform(s): A lighter, stronger frame is possible. A beefed-up unibody/unit-body has been rumored. Both possibilities are said to be aimed at greater safety, performance, comfort and EPA numbers. Off-road prowess is said to remain a priority regardless of the platform.
Modern Axles: Toyota might opt to eliminate the solid rear axle in favor of an independent rear end. Test vehicles have been seen with an independent rear end that may be aimed at future Toyota and Lexus 4X4 trucks.
New Design: We fully expect to see a resemblance to the newest Toyota RAV4's design with the upcoming 4Runner. More than one person connected to Toyota said the FTAC concept is a good indication as to what they are thinking.
Vs. Jeep: There may be more variants given the rise and popularity of Jeep's newest products. The Toyota 4Runner is one of the few vehicles that currently goes nose-to-nose against popular Jeep products. They are fully aware of this.
2021 Toyota 4Runner Rumors, FWD 2019 Mazda3 and Pet Hair? [Ask Nathan] - The Fast Lane Car