Why won't my 2002 platinum edition mercury sable ls engage in gear?

Question edited for clarity.
Question moved to model category.

https://www.google.com/search?q=2002+mercury+sable+wagon+shakes+in+first+gear

You need an auto electrician with a pro grade scan tool computer

https://www.google.com/search?q=auto+electrician+near+me

..

Question edited for clarity.
Question moved to model category.

Relay 4 in the engine compartment fuse box.

Mercury Sable (2000-2005) fuses and relays

https://fuse-box.info > mercury > mercury-sable-2000-...
2000, 2001, 2002, 2003 - The fuse box is located below and to the left of the steering wheel by the brake pedal. The location of the fuses in the passenger ...

The overdrive in the converter engages at certain speeds and rpms. The converter is always pumping when the engine is running. The fluid goes into different valves when you put it into the gears.

Mercury Sable - Wikicars

wikicars.org/en/Mercury_Sable

The Mercury Sable is a Large Front or All Wheel Drive Luxury Sedan produced by Mercury ... A major sheet metal and interior redesign occured in 2000, softening some the .... For both 3.0 L and 3.8 L V6 engines, the drive belt system became a .... Also a new trim level was intoduced the LS Platinum Edition, it featured Satin ...

With a steering wheel puller. Ford Taurus Steering Wheel

you tell me .

ok sounds like the transmission might be your problem
first you would need to change the transmission filer by pulling the transmission plate and draining and replace filter and fluids new fluids prefferably. if that doesnt fix it. you could have a sensor or computer part out only real way to know is to take to shop to get looked at. hope this helps good luck

contact your local dealer and give them the vin

screws on inside,but more i cant tell you as not many of them to the euro here in spain