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Haisley 5k springs seem to have quite a following, I personally inquired about Columbus diesel 5k springs and was told it almost always takes a pump shop to get them to idle decent. I decided my bosch 4k springs were good for my street truck. Few people have the air flow mods needed to really run 5k springs.
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1996 3500 4x4 5spd
1991 D350 5spd
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