ebayfish Posted October 27, 2014 Share Posted October 27, 2014 I just put a set of 33s on and my 18k gvrw Hayden 403 cooler isn't cutting it. Its running 170 on the interstate & 205 on very hilly country roads on an 85 degree day. Would it be best to run a second cooler inline or reinstall with a Hayden 678 (24,000) or Hayden 679(30,000gvrw)? Link to comment Share on other sites More sharing options...
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