I actually talked personally to the service department before I did any mods.I had told them exactly what I was going to do and they told me that it would not void the warranty. The day I was going to have the tires mounted I called and asked again just to be sure and they told me the same thing. Keep in mind that it is their word against mine. Who knows what would happen if I had a problem. It is a chance you take. We cranked the torsion bars on my sons Nissan X terra 1.5 over 40000 miles ago and he has had no problems at all.
Cranked 1" the ride is the same. 1.5" and you can tell a slightly stiffer ride. Depends on how picky you are. Your back end will still be about 1" higher than the front when you crank it to 1.5" I would not recommend going over the 1.5" mark.My wife drives it every day and has no complaints. We both had made the comment that with the bigger tires it actually rides and handles better. For her to notice the difference really shocked me because I had thought the same thing but just didn't mention it to her.
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