Over the past couple of days I have seen several posts where guys are concerned with their CV angles after installing a 2.5" level so I thought I would jot down some thoughts.
Summary first: you are right to be concerned.
As you know our trucks have a 1" front lift relative to a regular F-150. 2.5" of lift is generally the rule of thumb to stay at or under with IFS to keep angles safe, with 3" being the absolute maximum. When you lift your Tremor 2.5" you have an effective 3.5" lift. As a result, yes, your CVs are at an angle where you will start to see boot wear. Because there is also no diff spacer available for Fords like Toyota, if you want to lift that much your really need to start thinking about a drop bracket kit, though I don't think anyone who has spent any real time offroad would recommend that to you.
Personally I have adjustable coilovers spun all the way out so that I have a net of 1.5" over stock Tremor height, 2.5" over regular F-150. Still easily clears 285/75R18 (34.8") tires, and sits level when I tow a moderate load. Have about 1.5-2" of rake unloaded.
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