Although they are less than a mile from my home, I am not very familiar with Fabtech's products, but I am guessing that you have their 4" Performance System and it required a TC drop and gave you a different bracket for linkage? If this is correct then the best thing to do would be a MML in conjunction with the BL to adjust for TC position shift. This may work, but to be honest every Jeep is different in regards to this and where some have no problems other do. If my supposition is incorrect please inform us of specifics and we may be able to help you out better.
The suspension lift really has nothing to do with the TC position unles you drop it to alleviate drive line vibes.