Hi GearMan...John Kully here...thanks for your input...If you come across a 3.90, I need it in a single axle project (restoring a 1946 Chevy 3/4 ton Pickup...with a HO72 with Eaton 4.57 gears) I am getting a set of 4.10 shipped in, to use until I can find the 3.90's...as of now with the 4.57, I can only go 38mph...the 4.10 should take me up to 50mph while the 3.90 should get me to the mid 60's...I hope...It take a long time to drive to lunch now... :) John
PS if you find a 3.90 gear set…I’ll Pay a $50.00 finder’s fee… John Kully 772-776-9790 or
johnkully@gmail.com