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As far as I can tell there are 3 companies producing converted 48RE valve bodies. The Sonnax unit is around $900 US for it's patented design. One I will not mention as it is priced out of range for most anyway.The one I have decided to go with is Central Valve Body Billet 48RE conversion kit & all available SONNAX 47/48RE updates in my hybrid 47/48RE build so my review on this is a few weeks away now.