I have to takf off in 1st and manually shift. If i go to D or OD too soon it's just like shifting to neutral. When at highway speed it is OK until i slow down to where it might downshift it's like shifting to neutral. Any info would be appreciated.

The normal issue with a faulty switch is the car will not start in park and-or neutral and the backup lights may not work in reverse.

I have a 92 Crown Vic first and second works fine reverse works fine when it shifts in the third gear it goes to slipping and overdraft can you help me fix this problem thank you

If the AFT fluid level is ok then the only thing that would cause this is that the transmission has failed, the clutches are burnt up or worn out, the transmission will need to be replaced or rebuilt.

This will not repair the problem but it will cause your OD to shift. Caution: you need a long stretch of highway and sparse traffic.
After trying everything I could think of, I noticed that when the automatic locks failed to engage (at around 15mph) that's when the transmission would not shift into OD. So, now when the locks don't lock and the transmission doesn't shift to OD, I put the transmission in neutral and turn off the ignition and let it coast to a slow speed (see above caution). When I start the engine again and put the transmission back into drive, the locks engage and so does the OD. Works for me. I'm currently doing research on what causes the locks to engage automatically. I'm thinking it will be a vacum or a switch. BTW, mannually engaging the locks will not work. Good luck. Hope it works for you.

try cleaning or replacing the EGR valve? hope this helps

It sounds like your input clutch seals are rolling. Is the check engine light on. It could also be the pressure control solenoid could be causing the problem aswell

Either your clutch is getting bad, or you're shifting down too soon, and up too late. Try double clutching. Push in your clutch and push it into neutral. Release the clutch, fan the gas pedal, push the clutch again and shift into 1st. All this does is sychronize the speed of the transmission with the speed of the engine. There were, in the 60's, a lot of cars with the old "three on the tree" that you had to do this every time, and you get pretty good at it after a while.

it sounds like it is in limp in mode. try disconnecting the battery for ten minutes and reconnecting. this will reset the pcm and clear the fault codes. if it was just some sort of fluke if should be ok, if there is a problem it will return to limp in mode. if it wasn't acting up beforehand, it's more than likely an electrical, or computer problem, not a mechanical issue,

shift linkage needs adjusting,,could be bent, easy fix, located along firewall to fram beneath the column, ask your son wut he ran over and didnt tell u about... hope i could help...:)

transmission?