Okay well I got some FRPP 4.10s with a DM speed cal in my room staring at me begging to be put in! currently i have 27000 miles and am still under wanrranty... How bad would the input of these be to the warranty? In general? complete void? thanks!
That's just stupid. Cali sucks.speedytang said:In Cali it will void your emission warranty to change gears. I could explain but after going to SEMA for a couple of years I have seen and heard it all from the manufactures.

hobbes80 said:would void your rear-end, basically. Anything that can justifiably said that the gears directly caused the problem with.. same for the Speed Cal...
If your A/C compressor dies, it's not because you have 4.10s. If your blinker fluid needs to be refilled, they won't refuse because of the gears... so figuer rear-end, possibly your posi-unit. Probably that's it...
A lot depends on the dealer.. the more of a jerk they are, the harder it will be to get them to honor the warranty. But the law states that only those parts "Directly impacted" by the Aftermarket part can be voided.
Happy modding.
Very subtle 
Screaminyellow7 said:But what if you buy the gears from ford, i heard if you buy all SVT parts, you kinda get away with it.