Nathan, according to the shop manual the F8 had 2 tranny options - a regular 5 spd and a 5 spd od. 1st, 2nd and Reverse were spur gears. 3rd, 4th and 5th were helical gears.

The gear ratios only gave 2 more granny gears. Third gear ratio of 2.40:1 was similar to first gear in the F1 3 spd. So you wouldn't gain anything if you could even bolt it up. I haven't seen one, but I wonder if the tranny for the 8EQ matches the 8RT bellhousing??

I think you might do better to look for a T5 or an OD from a mid 80's pickup.