where can i find a proportion valve for my crown vic?

you mean a air conditioning expansion valve.? not sure transmissions have these anymore.~

Probably Brake Proportioning Valve, on master cylinder, part of what distributes brake fluid pressure to front or rear ..click image

http://www.autopartsexpress.com/parts/FORD_CROWN_VICTORIA_Brake_Proportioning_Valve.html ......$99 . .....Good morning Judge

rock auto parts could be a good place to check.

Morning fellow GURU's....David...good to see you up and about and comin' to my rescue EVERY TIME!!~

Good morning yer own self...hey not everytime...on occasion maybe but certainly not everytime...

Almost any parts store should be able to order a proportioning valve for the Crown Victoria/Grand Marquis. Keep in mind, there are 2 different ones for the 79 to 91 Panther platform. There is the standard sedan/coupe unit and the station wagon/Trailer Tow III unit, which is differently proportioned because of the larger rear brakes in these cars.