no. It's a live-rear axle set-up like the Ford Mustang. The is no Crown Victoria ever built for public consumption with an IRS.
No, different electronics/sensors.
yes.
It should be a direct swap.
no, its a different design
In the 1999 Crown Victoria the LCM, Lighting Control Module , contains the relay for the turn and hazard flashers. This located under the dash.
5x4.5
Yes.
According to the 1999 Ford Crown Victoria Owner Guide : With single exhaust ( 200 horsepower ) With dual exhaust ( 215 horsepower )
can 5.0 engine fit in 1999 crown victoria
On a 1999 Ford Crown Victoria : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle ( if that is what you mean )
6x8
190-210