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No worries - I didn't know what you were starting with, and where you were headed.
I did some quick research. I have NOT played with the 944 transaxles, but the 911 transaxles from that era you can swap the drive and driven gears for pretty easy overdrive.
It MIGHT be possible you swap the fifth gear sets into the fourth gear for 1:1 in fourth gear, then take the fourth gear pair, swap shafts, and have a pretty massive overdrive for fifth.
This DOES mean a pretty big jump from third gear to fourth gear. But My bet is for road racing you will only use first through third gear.
Another option is leave first through fourth alone, and turn fifth into a huge overdrive. On the 911 gear boxes, you usually can't change first gear which is fixed to the main shaft. Don't know if this is true of the trans you are using.
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