Hi there canadian, we have two seperate GT-Rs one that is used for both street/circuit dutys, the other for drag racing, both using OS-giken RB30 engines for motorvation and have used Holinger sequential, OS-88 v1,PPG dog 5-speed (local aus made),OS-giken Cross Gear synchro 5-speed with varying results! Firstly the Holinger has been overall the most reliable of all (drag-car), but has to be maintained (15-20 drag passes) and is not particulary streetable. The OS-88v1 was a complete disaster in our drag car (enough said) hopefully v2 is better! The PPG dog box is a 5-speed gear set used in std case,has had some reliabity probs but slowly working that out.The most 'streetable' of the lot is the OS cross-gear set mainly for its synchro operation, and has also proven the be the most reliable, albeit with the car de-tuned to suit lower rpm shifting of design. Unfortunately IMHO you wont see 20000ks between rebuilds of any of these gearboxes, knowing the sort of torque/power that OS motors can make:thumbsup:
Hope this helps