The radiator in my 1991 YJ with a 4.0 needs to be replaced. I work part-time at the local NAPA and the radiator listed for a 1991 is aluminum with plastic tanks. The radiator for a 1990 YJ is copper and brass. Will the 1990 radiator work in my 1991? I am not sure about running plastic tanks in a Jeep. By looking at the pictures and measurements on the 1990 radiator it looks as if it will fit.
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