MY ford f250 1988 is trying to turn on by itself?

MY ford f250 1988 is trying to turn on by itself. I have replaced the starter and the solenoid 2 times and it worked for awhile but now its doing it again. I'm pretty sure its something causing the solenoid or starter to go bad but i can't figure out what. I would sure appreciate any help you can give.

Why won't my 1990 Ford F250 Lariat XLT start?

I've ben having trouble turning the key in the ignition like it's gummy in there or something, for a few days. T's been very hot lately and today I had to use both hands to turn the starter. Went to the bank, came home, squirted a little WD40 around the ignition… Now the ignition turns just fine, but the engine won't start, just makes a whirring noise. The engine has full power, everything works, but engine won't crank, just makes a whirring noise.

What would you pay for a truck with 113k +miles?

My friend is selling his truck it is a 2005 Ford f-250 super duty (I think) it's a huge truck (diesel) with a lift kit. When I said I'd buy it he said he would throw me a deal, he said it blue booked for 18k and that he would give it to me for 15k he said it has had a ton of problems but he bought all new parts also it has 113k +miles I feel like 15k is to much for that maybe I'm mistaken but I'm sire I could go but a new car with that much.

1990 Ford F250 C6 Transmission is a little soft on take off in drive?

I have bought a 1990 Ford F250 Custom, that was damaged in the last ice storm, great truck, it is a little slow on take off in drive.
I can shift the leaver down to-D1- & it will take off as it should.
I'm thinking of droping the trans. Pan & changing the filter, which has probably never been done.