I have an '89 Fullsize Bronco with the Dana 44 TTB up front. Very shortly I will be installing an 8 inch suspension lift on it, in addition to my 3 inch body already. I have a set of Mickey Thompson 39 x 18s that will be going on there.

My question is, can I have the axle aligned with my current 33 x 12.50s. My local Brake Check will give me a great deal on a lifetime alignment if I am running 33's. They wont even touch the 39's with good reason...

Does the TTB change its angles depending on which tire you are running. Sometimes I think yes, but it seems like it wouldn't care. Just looking for the facts...

Thanx guys

P.S.
How do I tell if my factory shims are at zero degrees? Should the lift kit return everything back to zero degrees?

Im planning on ordering a 6 inch kit, and these 2 inch leveling spacers... But the manufacturer says the factory shims need to be at 0 degrees...

 

Wider tires and less backspaced wheels can cause more leverage and moves were the weight is distributed. It can cause differences, but I think that they wil be minimal.

 

Not dramatic, but not just minimal. The change occurs because the pivot bearings are loaded differently, the spindle flexes on the knuckle, and the ball joints give a little too. Of course, wheel offset affects the leverage exerted on all these parts.

Simple experiment. Check the camber with the wheel lifted off the ground (weight of the wheel/tire hanging), but supported directly under the spring (so suspension movement is not a factor). Then set it straight down and check camber again. You'd be surprised.