Quote:
Originally Posted by wdfifteen
I don't know when they changed, but the compressed ring system used on my 519s are very slow. From 1 to 2 you need to shift fast and hard and not worry about the noise. The 741s were a little better. I understand the 901 was a 741 with more gears.
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The 519 and 644 are a weird design, but technially synchronized. It doesn't have traditional dog teeth in the way we usually see them. You are correct that the 741 is when they "modernized" the design. Porsche was stubborn and refused to abandon the split ring design for more than a decade after the Borg Warner design had proven itself better. But then they were also financially on the ropes and considering killing the 911 model line compltely.
The 924, 928 and 944 we're the first to get Borg Warner style Getrag gearboxes. The 911 kept using the 915 for another ten years because the whole car was on the chopping block and they weren't going to invest in a new gearbox for it. Only once it got a stay of execution did they commission the G50 Getrag gearbox and out Borg Warner syptyle syncrhos in the "flagship" as well.