.....I understand the whole geometry of the steering, but im looking for other options and sugestions about the tb drop bracket and drop pitman arm, I can read the sales pitches at any dealer site, im looking for real time setups people are running on 4 inch lifts and how its working for them the ad doesnt say hey you can use stock components and just this only, or you dont have to have the drop stuff anymore etc..............
The simple geometry is if you raise the frame with longer springs you increase the angle of the F&R track bars and the drag link, which pulls the axles off longitudinal centerline of the frame, creating stability issues and bump steer. To address this a few of the mfrs drop the track bar at the frame (drivers) side and use either a drop pitman arm or a drag link flip to correct the steering, combined with a raised rear track bar axle mount. This causes some issues. The dropped frame mount for the track bar creates a different roll center in front vs the rear, and the dropped bracket needs to be reinforced or it will fatigue & snap. Dropped pitman arms fix one problem, but create another, broken pitman shafts.
The increasingly more common and very successful design is to raise the front axle track bar mount to keep the frame mount consistent with and in the same plane as the rear, then flip the drag link to the top of the passenger side steering knuckle. A well engineered kit will get the drag link and track bar on roughly the same angle, will have the front axle attachment point at the same height as the rear, and will have the angles of the front track bar / drag link the same as the rear track bar.
I run a Teraflex 4" kit that was initially a bad bum steerer. I enhanced the kit with a Poly front track bar bracket and Tera's drag link flip (I tried but didn't like Poly's flipped drag link). I tried Poly's front track bar but went back to Tera's because I like the beef and the adjustment design. I use Tera's new forged track bar out back, which I have set at the same angle as the front bar and drag link. Bottom line, no bump steer and very stable on highway, great flex off road.