Ken, I've heard that rumor many times before about the 3.90 gears for the Eaton HO52 housing, if you find any documentation to back that up I would sure like to add it to my reference file. I've been unable to find anything that refers to that in any of the parts books. The 4.10 seems to the the lowest gear that was made for that Eaton rear axle.
Denny Graham
Sandwich, IL


Denny G
Sandwich, IL