Not in here a lot anymore, but just saw this. Look up the Malaysian guy with the turbocharged Ford Tierra. KasmanK, I think was his handle. They only sold the FS-DE there with the four-speed automatic, so when he turbocharged his car, he swapped the box out completely for a 626 box. Worked just fine for him. Gives you the longer fifth and a longer final drive, so all gears are effectively longer.
Hello guys,
I did the 5th gear swap with a 2001 626 and I have a problem. The new 5th gives me the drop I hoped for 500rpms over the stock, but when I am in 5th the data logger shows a huge load added to the engine and I can*t accelerate nor can I hold a speed without a huge load on the engine and bad gas millage. 24mpg at 3k rpms. 4th gear yields 30mpg at 3k rpms. I am hopping that it is only because I am running with no boost right now because my AFR in boost is so bad.