Hi! 32mm. I have a few of these in various guises. Looks like I'll need to round of the tip's edges a bit on the impact drive socket to make it fit nicely. G. Ameer Antar wrote: > > Hey does anyone know what size driveshaft nut is on a '85 5kT? I have a 36mm > socket, but it's too big...I'm guessing 28-32mm. TIA. > > -Ameer