WILLALL WR35SRK, GTR Mainshaft Repair Kit

The Nissan GT-R's dual clutch GR6 transmission is fairly new technology, that has taken some hits on the internet over some high profile failures. The GR6 is the first use of an all wheel drive DSG transaxle on a production car.  Not only is the GR6 the transmission, as part of the entire assembly, it is the clutch, the all wheel drive transfer case, and the rear end. The transmissdiffertransferrearclutchcase, or some other combined word along those lines.  One other issue with the entire assembly, is that from Nissan in the US, it is only available as an assembly, and an expensive assembly.   Aftermarket companies have been working on supplying parts to make up for some of the factory shortcomings when making lots more than factory power.

Willall Racing has developed a GT-R mainshaft repair kit that allows the securing of the front drive gear without having to replace the entire mainshaft. Willall says they will release pricing and availability soon.

Note the shaft is damaged and the splines have been chipped, which makes a conventional locking arrangement for the FWD transfer gear nearly impossible - or at least not up to a high horsepower standard. The previous solution has been to purchase a whole new shaft assembly, and fully strip down the gearset to fit an aftermarket shaft in place. Lets say now, the stock shaft is a - very - good and high quality piece.

Signs of the circlip failing (partially) are a noisy operation of the transmission, which you will hear at idle, and this is due to the bearing pictured now taking part of the main shaft thrust as the shaft moves forward and allows the transmission gears to rub against their opposing synchro hub. Transmissions in this state are not far from total failure....

This is where we designed the WR35SRK (Shaft Repair Kit) that uses a rifle bolt principle to internally brace the mainshaft and allow a high torque, high clamping load solution to hold the entire gearset together. Machined from Chrome Moly and with very careful design put into its oil pathways and 'anti-whip' structure WR35SRK slides inside the original Main shaft and provides a proper bolt up clamp where the existing circlip groove has been destroyed.

Source: NAGTROC