WR35 GTR Transmission Internals

WR35CC GR6 Gear Fastener System

Being involved with some of the quickest and fastest GTRs in the world via our GR6 transmission fluids and parts we get to see the results of continued high stress levels on the transmission, effectively giving us a window after only a few months as to what may happen a couple of years down the track. An issue that is starting to raise its head is one of circlip failure on the transfer drive of the GR6 transmission. The main culprit is the thin clip that holds the transfer gear onto the shaft. You can see it clearly in this shot. Its only this small clip and the press load of the gear that keeps the whole thing together, and when it comes apart be prepared for a mess. A new transfer gear, shaft, speed sensor etc. is often the result when it all goes wrong. Track cars may suffer from failure of this clip first, with the initial symptom being a weird noise in the gearbox followed shortly after by a lack of front drive.

Our solution is the Willall Racing WR35CC Upgraded Gear Fastener system. The actual design is far superior to a simple clip, capable of taking thrust loads, and holding the gear securely in position without any chance of failure. The two hardened steel 'halves' clip into the existing O-ring groove, then the thrust ring pushes up against the machined edge, before a high quality, high strength improved clip holds the whole lot in place. This design has proven itself over many years of motorsport and is a worthwhile upgrade to a GTR transmission to add durability and power handling capability.

WR35CC comes as a complete kit of three clips that replace all of the the weak factory parts in the GR6 transmission. Professional heat treatment, high quality clips, and excellent precision machining makes them an excellent investment for the health of your GTR. WR35CC is a must for those that have had their transmission apart to replace gears, as the factory clips are really only designed to be used once, then replaced. Re-using an old clip that has been 'spread' once greatly increases the chance of catastrophic internal failure.

WR35PS GR6 Piston Seal Replacement

A common failure starting to show up on the GTR GR6 Transmission is seal failure in the clutch mechanism due to the factory clutch seal failing and tearing along its edge. There are three of these seals in the GR6 transmission and failure can affect one or all of them at any time. With this in mind we used our years of seal engineering technology to come up with a precisely engineered and far more durable solution known as WR35PS.

A picture of the stock GTR GR6 transmission seal shows how the rubber body of the seal can tear, at which time the clutch pressure is released and the transmission will either go into full fault mode locking the transmission in gears 1-3-5 or 2-4-6 or will simply slip the clutches to the point where the vehicle is un-driveable and permanent damage can occur.

WR35PS solves this problem by having a high strength flex resistant seal body assembly which presses straight into the place of the original seal. A high quality temperature and wear resistant seal replaces the easily damaged factory arrangement and provides exceptional and improved sealing along with precise clutch actuation and engagement.

WR35PS seals can be purchased individually to allow for cost effective and rapid GR6 transmission repair.

WR35CCL GR6 Clutch Retaining Clips

When removing the clutches from a GR6 for repair with a WR35PS upgraded piston seal or to change frictions the factory clip that retains the clutch to the main shaft can deform which can lead to problems once the clutch pack is re-assembled. In short if the factory clip fails the entire clutch assembly can come apart and result in a loss of drive. Willall fix this with a new upgraded pair of clips that replace the small factory part. Codenamed WR35CCL the new clips feature a wide flange for much greater strength and are manufactured from high quality steel before being heat treated and hardened.

Note the factory clips on the left of the picture which can change shape when removed, and makes them no longer useable in service. WR35CCL is a sensible upgrade that we recommend to any technician looking to rebuild a GR6 transmission. Note the picture of WR35CCL in its installed location on the clutch assembly below.

WR35CP GR6 Composite Clutch Packs

Designed using high friction coefficient clutch face materials and extreme bonding agents WR35CP uses its fine woven composite structure to provide up to 30% greater drive clamp and torque transfer versus standard clutch frictions at the same hydraulic apply pressure. High quality backing materials are used to promote clutch stiffness and plate strength, while friction transfer slots to eliminate heat build-up and promote fluid scavenging under extreme conditions. This high quality engineering delivers less clutch slip more grip and most of all improved street and track performance for your GTR.

WR35CP technical specifications are as follows -

WR35CP Composite Clutch Packs (12 clutch plates per GTR)
Material: Composite Kevlar carbon high friction
Drive Coeff: up to 33% improvement with 0.125 friction index
Surface Area: up to 16% improvement in clutch face surface area vs factory
Temperature handling: Increase maximum clutch temperature point 400F versus 350F factory
Bonding: Double bonded up to 600F resistant, chemical resistant
Stiffness: Heat treated high strength steel construction at 68 Rockwell
Drainage: Deep wide fluid transfer slots for maximum fluid scavenging and heat transfer
Compatibility: Designed to work with factory and Willall transmission fluids

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