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mismatched tire pressure in rear helps. as does a load.
i drove my new tundra from kansas city to houston with about 700# inj the bed. ride was brutal. bouncy harmonic. had my tiers down to 29# to help. didnt help almost traded when i got to houston. there i aired tires back up. ran out of time on the 75 cent air pump before i got the left rear. didnt feel like spending 75 cents for the one tire so i left it. loaded 500# more and drove to tucson.
bounce basically gone. still hard ride but very little harmonic bounce. 29# lr, 34# rr, 30# front.
apparently the mismatched pressure breaks up the harmonics.
ran over speed bumps with one rear tire and it bounces like theres no shock back there.
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