For drivers pushing the limits beyond 1,000HP, the ULTIMATE protection against spline twist and shaft breakage is here. Designed in fit and function to work just like the OE, the 35-spline Sonnax shaft is bigger and better in all the right places for unmatched durability in Chrysler 47RH, 47RE and 48RE transmissions.
Moving up to a 35-spline input shaft requires installing a 35-spline turbine hub in the converter. This is a simple change that will not affect stall speed or any other performance specs, and Sonnax offers top-quality hubs and performance converter kits that make upgrading easy. Any converter builder can assemble a new unit or retrofit an existing one with these components.
Solid Shafts vs. Hollow Shafts: Which are Stronger?
The through-holes and cross holes in Dodge shafts are designed by the OEM to optimize converter function. Some aftermarket shafts have smaller holes or are completely solid all the way through in an attempt to make them stronger. The theory is that packing more material into empty spaces makes shafts less prone to breaking, especially at the cross hole area. In reality, this is simply not true — shaft strength and durability have FAR more to do with manufacturing processes than whether there’s a hole down the center. Why?
The problems you risk by changing or eliminating oil flow paths are not worth it for the tiny amount of material and torque capacity gained. Inconsistent converter release, premature clutch failure and insufficient lockup apply pressure all can be traced back to poorly-designed aftermarket shafts.
That is why all Sonnax 47RE/RH, 48RE input shafts keep the holes exactly like the OE. It is a key feature of the big shaft system that helps you confidently enhance transmission performance and in no way undermines the shaft’s strength.