Yeah what class of 69 said.Look in the yellow pages for a speedo shop.I use one in Lancaster Pa.I think they charged $75 to build a new ratio box for my big truck.When they where done it was off by less than 1 mph.
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70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires
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