We've been looking at the same comparison (ZR2 vs Tremor), here's some points I've come across that haven't been mentioned much, at least in detail and might help:
- ZR2's fuel tank is tiny at 24 gallons, although Titan makes a replacement tank that's 43 gallons for the Duramax 1500s. That would be quite the range.
- The ZR2 does have a slightly longer bed by 3" (70 vs 67), and the width of the truck is wider too, but with the F150 having a higher roofline, if any of that matters to you for garage/trails.
- Besides a front locker, the ZR2 comes with 4auto at all levels, the F150 you need to upgrade to the "High" package in '24 to get a full-time system and the Torsen, another $11K upgrade. We use our current front locker frequently, but like to play in the snow with our trucks, not too mention get out on icy/snowy highways daily.
- Unlike the F250 Tremor, the Tremor doesn't give much over an FX4 to validate its price that I could find. Different upper control arms (still stamped I think) and coils for the extra lift, retuned monotubes, and 33s. The Torsen would be nice, but less so now that it's rolled into a luxury package, and I prefer a front locker anyways.
- The shocks don't compare between the ZR2 and Tremor, the Tremor just has retuned monotubes ...that are black.
I'm a bigger fan of the Ford's payload, especially with Max Tow and not dealing with diesel/DEF, but will probably skip the F150 Tremor for a Lariat FX4 with my pick of better suspension and wheels/tires. It's also easy to find low mileage used Lariat FX4s, which gives me more budget to add my preferred capability.
If someone knows there are other functional differences between the FX4 and Tremor, would love to hear it. FX4 you can get the same drive modes, skids, rear locker, and gear ratio as the F150 Tremor. For what they're up-charging over an XLT, I would expect stronger IFS components and a lower gear ratio to match the larger tires/purpose.