[Andrew63]

I am currently driving a 99 Civic with a 4-speed automatic transmission that is dying a slow death after a fault free 325,000 mile life. The plan, when it finally does die, is to replace the original transmission with a junkyard tranny. I don't believe that I am forced to replace with the exact same part number. The Civic offered several transmission options, so I should be able to refit with a 'high mpg' gearbox. Has anyone upgraded (mileage mod) a tranny in this fashion?

Results/ problems?

Ideas and suggestions welcome!