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I have a 2015 Roush Rs2 that i had ford install the roush supercharger, also had ford install upgraded axles, i then installed drag radials for the rear so it would stick and not spin, my issue is that around 80 mph under load it seems a little squishy in the rear end. Has any had this issue or can advise what can be done to correct this? Thanks for your help
 

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Have you ever seen a drag radial under very hard acceleration? The sidewall is meant to deflect and wrinkle in order to keep the tread in contact with the pavement. I can well imagine that drag radials with their soft sidewalls feel a little vague at high speeds.
What PSI are you running in them? I might suggest running the recommended max for the street and lowering the pressure some when you go to the strip.
 
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