Matt, the only problem I see is that it will take much more tham 1200 to get the 5 gear in the tranny. All I could find was the Jerico 5 speed ($6000) and than Quaife, Elite etc($8000+)! A short nose R200 could be had for quite a bit less. Also, most any racing tranny will have a 1:1 top gear (whether 4 or 5th). So, back to different diffs!!