Great advice here, as usual. Just wanted to pitch in my two cents, as we do a lot of suspension swaps every week on various cars.
We
normally do not replace the front suspension hardware during a removal cycle
unless they are a torque to yield (per SoundGuyDave's description).
Most factory suspension bolts are not TTY.
But... we always look closely at the suspension hardware each time it is removed, as this is pretty critical stuff to have come off on the street or track. If we
see anything we don't like (rust, mauled threads, obvious stretch) or if
feel anything weird during removal or installation (like if the bolts took an unusual amount of torque or we felt stretch during removal) we junk the hardware and replace with new parts from the dealer. Last week we had a Subaru we installed coilovers on, replacing some other non-stock suspension bits. There was one bolt that took an unusual amount of torque to remove, and it had some serious stretch, so it got junked. That's the number 1 cause of bolt damage - improper (over)torque by a previous mechanic.
Still, we have replaced much of the suspension hardware on our 2011 so far and all of the brake bolt and nut hardware. Why? Because it comes on and off so much. With 3 separate shock combinations tested on our 2011 "test mule", and multiple spring iterations on each of those, the suspension bolts get a lot of cycling. Same with the brake hardware, which is swapped on/off after almost every race (to go from the street pads and rotors to the track versions). So if you are touching a given bolt more than about a half dozen times I
would think about replacing them just for good measure. It is cheap insurance and the alternative isn't something you want to happen.
Now remember, the S197 front hubs use a TTY nut to secure them. That nut has to be replaced when swapping in new hubs. Luckily the M-1104-A hub replacement kit (with ARP studs) comes with new nuts. If you are using regular Ford hubs you have to buy the nuts separately. We're on our 3rd set of hubs in 18,000 miles of use, but with 315mm R compounds and additional aero loading we are probably over-loading these hubs more than most.
