Noking and jerking between gears

I pulled the old battery off for about 5 day's. Replaced with a newer one, and my issue is it won't turn over ,When I turn the key on all the lights on dash is on including theft light I checked connections and tested relays and checked every fuse. Still won't crank. In leaning towards anti-theft or safety switch in the shifter. Any in put would be a great help. It's a 2006 v6 mustang.

Won't shift out of park and brake lights don't work

Brakes will do fine for a few days and then release after stops consistently slower until they simply don't let go. Tow it home or to the shop and let it sit for a few days and fine again. There have been two separate occasions where the collision prevention system randomly activated and it stored codes. It said hill assist unavailable and abs fault. Took it to the dealership and they charged me $250 something to put it on the diagnostic machine and tell me it's the rear speed sensors and the purge valve for the evap canister. Fixed all 4 speed sensors for good measure and the purge valve. Sti… Read complete

Car died on your interstate do turn old battery put new battery in car started and now speedometer don't work

Can't fine the issue with this code. Replace transmission position sensor but still have O/D off flashing. Check engine light on and car in limp mode. Any help would be appreciated

So i changed out my ignition cylynder when i noticed the key was getting stuck. Now after taking out the old one i am having trouble putting in the new one as well as the gear and retainer. The car has no power despite it having a brand new battery. The only thing that even makes a sound is the door chime! lol please help i just want to drive my beautiful car again...

I parked the car for a year but now its not changing gears and it turned on the OD drive lite on the dash

Getting up to speed the car will shift to 2nd and then keeping the acceleration up, it wont shift to 3rd unless I let off the accelerator, then it will go into 3rd, and then it flashes the engine light and will run like shit for a little bit, until the light goes off and will be back to normal, until I kick it down again.

It seems when I let the car sit idling for a little bit when it’s up to operating temp it seems like it smoked but it’s not smoking it seems to have a odd smell it it as well and I can’t figure out what it is I’ve checked for leaks in anything everywhere and there are none even the ac stays nice and cold whenever it does it tho it smells minty

My o/d light keeps blinking.. it stop for a few after I pulled a fuse relay and when I cut the car off and crunk it back on the o/d light started flashing again

Intermittent key not found message. New batteries in both fobs, message continues. Sometimes will start, get key not found message but cannot shift into drive.

can't seem to be able to clear code..... from an understanding tampering with transmission life on high mileage can futuristically can cause the trans to not shift properly having shavings from the transmissions gears....