I'm not sure how many passes we have on them, they've been under the truck for about six years. Just one bottom bar was just barely bent on one side. Truck weighs 3000# and does a 1.30 60ft. The first two years I had it, we would run two days a week with 275hp on a plate. After that we been running once a month with any where from 300hp to 350hp. The truck normally goes straight down the track every pass. That day at track the last two passes it pick the tires up and went left pretty good. Got back to the pits and grawled under and noticed the one bar. I dont know if it was bent enough to do that or not. Got the new one's on but haven't made a hit on them yet.
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