I need help from an alignment expert

May be that the lift of your truck is higher than her. Her truck is lifted 1.5 only.

 

It wouldn't affect it that much as the alignment would correct any differences. Altering one of these trucks is not as cut and dry as you'd expect. Everything effects something else as the IFS is a different kind of beast. The wheel and tire combo probably isn't ideal for the setup you want up front and will need to be spaced farther out to not rub on internal components. This can cause other rubbing issues though. Also if the alignment is bad already it will also cause issues. There is too much to explain in one post and I don't know how to make it make sense, but if you copy mine or gotoman's setups the truck should align similar if you can find a good tech. There is tons of info out there, I'd try and do a bit more to understand how it all works together so you don't feel like you're running in circles with these posts. Will help future modifications make much more sense. If you can get a baseline alignment that would also help to see what the issue(s) are. It works out sometimes, but but generally just slapping a top hat spacer and different wheels and tires might not get you everything you want for functionality and drivability.

 

I understand! Thank you very much for taking your time and explain this to me. I will try to figure out what to do.

 

JBAs are massive at the ball joint compared to some options so if you have a small rub you have a solution. I just don't know which are truly caster-only or if they will give positive camber too. On the lower arm, the forward bolt is camber-dominant and the rearward is caster-dominant but both impact both mearsurements. Since maxing the caster adjuster adds a little negative camber, it wouldn't surprise me if a UCA added a little positive camber to compensate.

 

It makes sense. But how do we know among so many options? The funniest thing is that the Prerunner with 1.5 lift and original UCAs will fit the 285s tires with 0 offset wheels without any problem. It leaves a gap of about 1/2 inch in the front and rear of the tire turning the steering wheel all the way, but when I put my JBAs on it, the gap was reduced and they were almost rubbing.

 

Caster is increased by moving the lower ball joint forward and/or the upper rearward. The way UCAs add caster is moving the upper rearward while the lower pivot (ball joint) is stationary so the whole tire is rotated rearward. It's what makes lifting these trucks a pain - you need UCAs to get caster back after lifting but UCAs move your tire backwards which causes rubbing with larger tires.