Yes, both model years are AOD transmissions.
oN THE 91 FORD CROWN VICTORIA YOU WILL LOCATE THE SPEED SENSOR ON THE DRIVERS SIDE OF THE TRANSMISSION ON THE TAIL SHAFT.
On a 1991 Ford Crown Victoria : Using a funnel , you add automatic transmission fluid through the ATF fluid level dipstick ( in the engine compartment , near the firewall , on the passenger side of the engine )
Yes, they are identical
For a 1991 Ford Crown Victoria : " regular " unleaded , 87 octane
In the gas tank.
4
All 1992 Ford Crown Victorias came with 4.6 SOHC engines (the first year they were used in the Crown Victoria; they were first used in the 1991 Lincoln Town Car). Early engines are often referred to as 'bastard blocks' because they use the same older transmission (the AOD) as the 1991 5.0 cars. Later 1992 cars will have a 4.6 block with the normal pattern for the newer electronic (AODE or 4R70W) transmission.
According to my Chilton's book : For a 1991 Ford Crown Victoria ( 5.0 / 302 and 5.8 / 351 ) With engine oil filter change ( 5.0 U.S. quarts )
10 degrees advance
Often in the owners manual is where i found the one for my 1991 Crown vic. Hope you have your manual?
The best is to buy a new one.
In a 1991 Ford LTD Crown Victoria ( 5.0 / 302 and 5.8 / 351 ) Follow the top radiator hose from the radiator , it connects to a housing on the front of the intake manifold . The engine cooling thermostat is inside the housing