I have a 1997 ford f-150 4x4, 4.6L, extended cab.
I was thinking of a little lift. By tuff country, they have a 2" torsion bar key for the front and 4" block for the back with shocks.

My question is, How will it effect the 4x4 knuckle in the front?

 

After market keys are usually bad news. They allow you to over-lift the front end and cause your CV-shaft angles to go into the danger zone and cause them to fail.

Your better off just cranking the stock keys, and keeping an eye on your CV angles. You will also need an alignment after cranking the torsion keys

 

Thanks, for the honest answer, I asked a few people and I could not get a straight answer....

 

No problem, I just didn't want to see someone else waste their money on aftermarket keys.