I have the eibach pro-kit on my 99 GT. Made it look like a sports car and not a 4 wheel drive F150!!!
Anyways... they ride good but I didn't like installing them much!!!
As for 4.10's NO NO NO NO NO
not if you drive 50 miles. If you want them you better have a good job to pay the gas bill!
3.73s would be better i think.
Anyways... thats my input! Hope it helps!
Jodi
68 and 99 GTs