been said already but i just read this thread....and with personal experience, no. 35" with a hp44/9" and i've busted several front stock shafts and a rear shaft. good axle combo for 35" with chromos in front but not 39". RCV's in the front and 35 spline the rear and run 37" but if you have a half decent motor and a right foot it will not do 39 with stock parts.