Re: Rattle against firewall
The rattles I have personally diagnosed and fixed, where from the driver's side and one from the center. The one from the center, was metallic and was loud at say, 3 MPH. Turned out to be a loose skid plate bolt.
Search around here for other threads. One talks about heater core hoses buzzing against the firewall.
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1986 Jeep CJ-7 Last of the real Jeeps!!