Better, I was wondering about 1989 and AYU
If you really want to replace the AKD with the AZG you need to replace the front axels as well! AKD = Rzeppa homokinetic joint with 108mm flange, AZG = Tripode homokinetic joint with 100mm flange, the optical difference you will see from far away, Rzeppa's are "open" so you can look directly to the bearing balls, the Tripode's are closed (very nice because it's easier to handle without getting dirty hands
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