How does your rear diff pinion angle actually look? If you could visualise the pinion shaft, it should be parallel to gearbox output shaft. When you lift the car they usually point upwards but as you mentioned you've got the longer lower arms. Personally I like the adjustable upper arms as this is an easy way to adjust the pinion angle as opposed to using set length arms.
To me it all looks good how it sits now.
I thought the same thing Stropp, but after some research, apparently they do correct pinion angle.
However, this isn't the main reason the longer lowers were installed. It was to allow more clearance between the rear axle (sway bar bracket) and the drain plug on the long range sub tank.
I have ordered a spacer, supposed to be here between Tuesday and Thursday, then just need to get some longer bolts.
If that doesn't work, out with the spacer and out with the longer arms, standard arms back in and try again...
Evo
Cheers,
Evo
I will be interesting to see if this fixes it as a slip joint issue would normally cause a vibration not a grinding noise.
Evo (26th February 2014)
OK so the problems still there?.
Try looking at diff crown and pinion.
When I got my GTR it had been run low on diff oil.
breather was bad design, oil blew out breather to easily.
any way that had shagged the bearings.
new bearings didn't fix it completely and once bearings settled in it returned some-what, no way as bad but still there.
my description hollow howl guess you could described it as grinding.
unfortunately damage extent was also to the lap on crown and pinion.
only fix was to have crown and pinion relapped and diff reset again.
Ohh and noise increased with speed like you describe.
"separate note".
in the drift world the diff housing angle is changed upwards or down to decrease or increase wheel grip.
my therory,
4" lift will have the similar affect up wards increase in angle, this may put undue strain on diff bearings crown and pinion.
not saying Im correct just a little thing that had crossed my mind as a possibility.
In pic the sub frame is what houses the diff so changing that angle changes the diff angle.
It has something to do with how the diff loads up and then transfers the torque to the ground.
going by pic, diff angle down loads the diff for more traction at the wheels = added strain on differential assembly.
food for thought,hope this helps.
Last edited by Robo; 25th February 2014 at 10:45 AM.
IF IT'S NOT A NISSAN.
THEN IT'S A COMPROMISE
something that I noticed also.
a raised pinion lowers, (tips) the filler plug downwards.
That equalls less oil in diff housing.
IF IT'S NOT A NISSAN.
THEN IT'S A COMPROMISE
Evo (26th February 2014)
Hey guys, bit more of an update, installed the spacer, made sure there is enough play on the splines so that there would be no bottoming out of the slip joint, if anything, the noise/rumble,is less evident, but still there.
Just about had enough of it so at the point where I'm going to just keep driving it until something gives.
Evo
Cheers,
Evo
Not sure if anyone is following this anymore, been a while since any new info.
For those that have been or still are keeping an eye on things, issue rectified.
Cheers,
Evo
Cheers,
Evo
Woof (24th March 2014)
that's great can you say one way or another what the actual cause was.
04 ST 3lt auto, not enough Mods to keep me happy, but getting there
Nice to hear.Originally Posted by Evo
And the fix was????
IF IT'S NOT A NISSAN.
THEN IT'S A COMPROMISE
Lower trailing arms...
Standard ones put back in, smooth sailing...
Evo
Cheers,
Evo
Clunk (30th March 2014)
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