Yes, in 1996 the A500's changed to the updated planetary kit at the factory. Is it a good thing to do? My understanding is it was done because the 15 degree planetary setup was stronger than the old design. If it was my transmission and it was in need of an overhaul, knowing what I know, for peace of mind, I'd get it done. Not inexpensive, but to me a worth while investment. While the transmission is out and apart, why not do all updates and modifications. JMHO
