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Discussion Starter #1
I think you gave me a list on the three available

about to strip some boxes and check what i have and where they originated from. thanks
 

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They're all stamped on the crown wheel - post up what you've got and I'll work out what they're from.
 

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16/63 is a 2.5 box. GTA box is 15/56. 1.9 16v diesel uses 16/57. 2.4 10v 5-speed uses a 17/57 but I wasn't aware of any 6-speed boxes using that final drive.

(if you divide the bigger number by the smaller number you get the conventional final drive ratio)

3.9375:1 - 3.733333:1 - 3.5625:1 - 3.353:1
 

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GTV 3,0 uses a 16/57 final drive in the 6-speed, which is the same final drive as the 1.9 16v diesel but with the std V6 gear set instead of the diesel gear set. Basically a slightly longer geared version of the GTA box.
 
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