2005 V6 Mustang. When I make a hard stop, the tranny disengages for several seconds and then drops back in. Then when taking off again it's like the clutch is slipping. It's an automatic. The tack is also not working properly.

Yes, this is usually caused by a failed pedal position sensor. A new one is about $120, so I would test before replacing. There are two pins tbat should have a linear change in resistance as the input is rotated.

check for water damage on the computer. it sound like a mustang i fixed a few months ago. the customer broke the windshield and the body control computer got wet. so the car was cranking itself or turning lights on when raining until running battery out of charge. he could not drive vehicle on rainy days until 2 or 3 days later. this car wasn t convertible but since u said they change the winshield i could be leaking water.

A couple days of driving like that, and you will
be pulling the trans, and emptying your bank account

I would not drive any of todays high tech vehicles,
farther, than to get home,then park them,until you
diagnose and repair.

You could possibly need a new trans pressure control
and solenoid pack , in trans,if it doesn't shift perfectly,
and if the tach flairs at all,it is slipping,good luck on that.

Don't use it at all, get it checked out

check gear fluid in the tranny, brake fluid in the clutch master cylinder. after that check slave cylinder and linkage

Take it back

You'll need the K-member from a 94'-95' v6 or GT, along with the correct motor mounts. once you have that it should drop right in. But there are many more parts you'll need to make it work like a 5.0 tranny, exhaust, wiring, pcm, radiator, and maybe more. Look in the Ford Racing catalog and drop a 4.6L Cobra motor in there. A lot fewer parts to buy. Also if your state has car inspections the 5.0 is not OBDII, and should only be attempted if its going to be a "race only" car.

Before attempting any work on your car go and get a Chiltons or Haynes manual (from your local auto parts store) for your year/make/model. It will cover several years and models, but has detailed instructions with photos on how to do just about anything you need to do. Secondly, I suggest you get a buddy to help you. The tranny is heavy in your car, and if not done correctly could put you in the hospital should it land on your head. Replacing the actual clutch really isn't that hard in a Mustang. Its getting the transmission out and back in (probably while the car is on jack stands) that can be hard.

your transmission needs new fluid fast or your tranny is starting to leave

if you get no help on here
try auto zone