NC 6th gear rpm 'wobble'

[keito]

Yeah the clutch is less than 200km old. Definitely no clutch slip. Plus there are no steep hills within 300km.

[Luke]

Two months ago on a long trip home I lost clutch hydraulic pressure, making it very difficult to change gears. Managed to limp the car home almost 400km (not fun) and decided it was time to do some major work to make sure I was set for summer. Drained and replaced the hydraulic fluid, bled and tested the master/slave cylinder. Everything seemed fine and the clutch was working again.

Recently had my diff replaced with a 4.1 lsd from the states (thanks Boyracer) and installed a GWR midpipe and SQ exhaust. Everything seemed fined until I hit sixth gear, at which point the car would lurch quite noticeably, at any speed and on any road condition.

Tis logical. Problem didn't exist before, changes made, now the problem exists. Look at the changes.

Nope. Problem existed (and was worse) before the clutch and flywheel were replaced.

I'm with Bruce here.
I have no idea what your issue is but will point out the obvious.
You say there was no issues before the exhaust and diff mods, so why not remove 1 at a time to work out if one of them is causing it?
Getting a clutch and flywheel changed seems like a strange way to solve a problem that was not there before those other 3 mods. That's just adding to the confusion.


Also there is one thing not 100% clear in your leadup story.
Before ytou did those mods, but after your bled all the clutch lines was the car exibiting this issue?