I saw this post and had to comment.
Most of the eibach shocks are digressive in design, but some of the reservoir rear shocks like the ones on the F-150 and tremor are a bit more linear. If you go for the non-reservoir version the shock will be more digressive. Additionallly shock surplus discovered during testing that the 2R kits don't behave well at max lift on the trucks with lifted springs, like the tremor, when you push the preload past 1.7". So they are recommending to their customers that the max preload lift stay under 1.5" for correct bump and droop behavior. This likely explains why you saw contact on your steering knuckle in the post above. If you have a normal height F150 you probably could use the full 2" without major issues, outside of losing compression height.
Lastly Eibach is developing a 2.5" body shock that should land in the 4th qtr of 2025. That 2.5R with coils kit is expected to land around the $2k mark.
The current 2 inch body is just barely able to control a 33" tire under fast thrashing, which is where it really starts to show its weaknesses. I'm not knocking it, as it really is one of the best OEM shock upgrades out there. The 2.5 are intended to take that to the next level and and provide an option that should control larger tires under adverse terrain or heavy loads. My best guess is it will ride as well if not better than the current 2R and fill the market pricing hole between custom tuned Fox 2.5's and the Bilstein 6112s. A better comparison would be to consider them as a low budget version of the Bilstein 8112.
