Hi, don't mean to sound obtuse but how can I screw up a gear ratio?
 

Hello, I have code 735 which it's incorrect third gear ratio. it's a sporadic code on my car, is it fixable? I have never noticed any shifting issues so I wondered. The main reason I'm asking is because I'll be putting this transmission into another car. Not me personally, I know my limits. Thank you much folks!

Probably a clutch pack or band slipping.

It's an automatic, might be scrapping. it. The person who was going to sell me the max that needed a transmission scrapped it. almost afraid to ask what the yard wants for the car now. Thank you