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The 930 will definately be stronger than a 915 box which similar era 911's used. I think the 930's mostly had stronger sychros and gears, not sure about the ring and pinion. My Porsche has very high gearing in all gears (4th and 5th both are overdrive) which is made up with a lower ring and pinion, I think mine is 4.60 something... so I think you'll find a ring and pinion in your range, but realize the whole tranny is geared higher than an american counterpart. Different year 930 boxes had different length bell housings too, I think, so be aware when you get your adapter and clutch.
Also, is this a Baja bug dune buggy or a sand rail? There could definately be some mounting issues were it a Baja bug.
I see companies that advertise 930 boxes for sale for use in high hp dune buggies in the magazine Hot VW's, so you may want to pick up a copy and speak with one of them.
Depending on the hp/tq your plan to make, and where you plan to drive, you could possibly get by with a 5 speed 915 box too.
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