If I were going to do a mid mount with a Holinger box I would use the RD6 Sequential box. (V8 Supercar, Dodge Viper etc) They do a transfer housing and a slip yoke housing and have heaps of different ratios available.from a 6 speed with 6th @1:1. A 6 speed single overdrive and a 6 speed double overdrive. Also a 5 speed is available with a single overdrive. Not to mention the fact that they are rated to 800NM of torque! The transfer housing can be mated to their Alloy nine inch housing and adaptors can be made to suit just about anything. As the Quill shaft (Inptu shaft) is seperate you can make one to suit any didtance you require.
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Although one of these boxes will set you back around $19K or if you know someone
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around $17K and you can set up a remote shift from the back, top or both. One Bad Mother FLIcker