stuart Posted June 30, 2023 Report Share Posted June 30, 2023 17 hours ago, Drewmotty said: I’ve heard that the 4a half shafts are stronger but no one has been able to explain why. The TR4 ones are machined down from large diameter stock leaving the bearing abutment with a radius blended into the shaft. The 4a shaft is made from stock the diameter of the shaft with a bearing sleeve shrunk on after machining. I assume that they are made of the same material and given that the weak point will be at the machined taper and the spline root I can’t see why the 4a shaft would be any tougher. With my production engineer hat on it looks like a cost saving change. A case of “ the emperors new halfshafts”? I dont think theyre made from the same material hence being stronger. As Peter says the Dolomites put some serious power through them and I know that some of the rally boys are shoving nearly 200hp at them and they dont break them. Stuart. Quote Link to post Share on other sites
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