Did I just buy a money pit?
Picked up a 1995 F250 7.3 last night. Test drove it and it shifted fine, perfect actually. Drove it home, up on the highway with a plow on it for 30 minutes. Got off the highway and climbed a large hill, the truck stayed in low gear a very long time, then slammed in 2nd. At this point the OD light was flashing and the truck shifting very hard (limp mode). Spoke to the owner who claims this has happens a few times a year (for a few years now) mainly when towing, but sometimes not. He has been able to clear it but cycling the key a few times. I got home, let it sit for an hour, and then drove it around (hard) and it was totally fine. So google says my tranny may be a goner, but I am not sure for a few reasons. 1) this has been happening for thousands of miles, 2) it doesn't happen all the time, 3) atf is clean pretty red, the smell is so so
If I buy a scanner can I read the past code or does it need to happening right there and then?