30mm
Its on top of the trans as you're looking down. Its not internal. I've replaced mine on my 1997 Sable.
Solenoid in trans
According to the 1998 Mercury Sable Owner Guide : ( Motorcraft MERCON-V automatic transmission fluid )
it is inside your trans
According to the 2000 Mercury Sable Owner Guide : That is your check trans-axle ( transmission ) warning light that is located in the bottom / left area of your tachometer ( a problem has been detected , shifting may be restricted ) ( if warning lamp remains on , have your vehicle serviced immediately )
The trans axle is the transmission on a front wheel drive vehicle
On a 1996 Mercury Sable : The automatic transaxle ( transmission ) fluid level dipstick is near the firewall and the brake fluid reservoir ( looking from the FRONT of the vehicle it is to the left of the reservoir )
Down the same tube that holds trans dipstick. Use a trans funnel, long, flexible and correct size.
Mercury Sable was created in 1986.
Linkage is broken or loose - or trans pump shaft is broken ( big job)
It's on the top rear corner of the transmission.