for starters you might want to look under that back of your car at the rear diff cover. On the cover is a tag, held on by one of the bolts. Clean that tag off and tell us what numbers are on it.
The problem is we dont know anything about your car except it has an open diff and 4 speed. In theory if one is available in the same ratio youd be fine. going 62mph (100kph) is a bit high in 4th but not excessive. I would guess a 4.10 or 4.27 open. I know they make a 4.10 open but someone else is going to have to help you on availability of a higher ratio diff if you wanted more performance.
The problem is we dont know anything about your car except it has an open diff and 4 speed. In theory if one is available in the same ratio youd be fine. going 62mph (100kph) is a bit high in 4th but not excessive. I would guess a 4.10 or 4.27 open. I know they make a 4.10 open but someone else is going to have to help you on availability of a higher ratio diff if you wanted more performance.
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