square1
Veteran Member
1.89" per this post from a upgrade kit somebody was selling in 2008Do you know what the diameter of the old vs. new axles are?
Ford 1700 Front Axle Hub Parts for Sale SOLD!

I guess the heavier axles were changed too during the 1980 model year so you could have either light or heavy from the factory. I can't find for sure when i.e > ser. #