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ignition switch is bad-not the key part -the electrical part-Replaced a lot of them-Good Luck
have it scanned asap before you drive it any more-may be something as simple as a solenoid but dont take the chance till you know-it can lead to catastophic trans failure-Good Luck
The most important thing is the proper voltage and grounding at the alternator-You need to have it checked and the problem will be solved-take it to a shop for this diagnosis and you will save money.
I agree to change it at 30K intervals-I would do a 100% fluid exchange(not A Flush with chemicals which will damage trans) that will get all the fluid out of the converter and trans cooler-I use a synthetic fluid and cost should be about $110.00
Suggest a scan to get to the root of the problem and to check for codes or electrical problems-Maybe a solenoid? no fuse that could cause this problem could also be the shifter cable if you now have no gears.
You check it with an ohm meter or HZ meter-it is not uncommon for the speed sensor to go bad-usually speedo jumps around and auto trans shifts irratic-Buy one from the dealer-aftermarket one is not of good quality-good luck
Is the abs light on or flashing-sounds like you need a brake inspection by a shop-may be in the normal braking system or could be something simple like a stuck caliper slider
Would need to see vehicle and do a diagnostic scan on the trans data to find problem-This is because the trans is shifted electronically and a sensor could be out of range when hot
Still sounds like a driveline problem or bad mount-I would get another opinion from a local shop since it is out of warranty I assume.
most common issue is fuel pump-But just a case history guess.With a no start could be spark or fuel related so a diagnosis could help if fuel pressure is low.