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do you need special adapter to upgrade 88' to j55 brakes .
No
The J55 abutment bracket is a direct replacement for the stock JL9 12" bracket on the spindle
You need the whole J55 setup; bracket , caliper and rotor; nothing from the stock 12" rotor setup interchanges
See https://www.superchevyperformance.co...les.asp?ID=123