Rb25det Sheared Speedo Drive

[roba]

Hey

Has anyone had their speedo drive shaft shear off???

I have a rb25det box in my r32, ive used a r32 gtr case and shaft and fitted the rb25det gear on top (red).

It has worked sweet for the last 2000 odd km's but has recently sheared off and lodged its self in my box.

Gotta pull the box apart and fix the drive, I dont want this to happen again... Did i do something wrong???

The shaft has some wear, may have been expanding when warm causing the other end to shear?

I had also been doing some tuning and seen several off the clock speeds... but speedo didnt go right back to zero so shouldnt be a problem aye?

cheers

[megrac]

Rob i would say that the r32gtr speedo drive may have a different offset round to the r33 one so the driven gear was loaded onto the driving gear too hard causing the shaft to break were its been flexing. Or the red driven gear has a larger diameter causing the same problem.

Raymond.

[BHDave]

The most common reason for failure of the navara and GTR drives in r33 gtst boxes is not adding a new locating slot at about 180 degrees out