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| Joined: | 10-17-2013 |
| Location: | Cambridge, United Kingdom |
| Posts: | 1 |
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Don't know if you got a clear answer yet but if it helps, in the UK the Viva 1800 had the same axle as the JH with the 3.727 ratio, as it's a later 1975 model it may have a flat bottom to the diff housing casting, this was a later mod by Vauxhall to increase the oil capacity slightly.
All the best
Clive