Strange howling/ringing noise at 97-100kph - Page 2 - Perth-WRX.com

HarreH89 · #11 29-01-2015, 06:48 PM

Quote:

Originally Posted by RichX

Hard to tell which part of the gears inside would be causing the whining though. I get the feeling it might not be the centre. Have you tried dropping the oil and putting some good quality fresh stuff in?

Yeah we did it the day we found out the noise came from the diff. The mechanic refered to it as period noise. Never heard of the term myself but there you go.

The idea of the LSD sounds awesome but as you said, probably isnt the centre thats causing the issues.

RichX · #12 29-01-2015, 06:59 PM

Quote:

Diffs can get what is called "period noise" at a certain speed - usually around 80-90 k's & disappears at higher speed. Although annoying, it won't cause any damage & can be fixed by getting your Crown wheel & Pinion gears lapped. This can be a tad expensive & "bang for buck", I'd probably put up with the noise unless it's a really nice vehicle.

Manual Gearbox and Diff Treatment- Nulon Australia

A possible option, but likely the crown and pinion.

Quote:

The larger PTFE particles circulate with the normal gear lubricant and create a cushion between gear surfaces, dramatically reducing gear pitting. This cushioning effect is important in that it reduces noise caused by minor irregularities of mating surfaces which are responsible for the very common "period noise" experienced in differentials.

HarreH89 · #13 03-02-2015, 08:08 PM

Well I got some qoutes for getting the diff lapped and my god, shit isnt cheap... Cheapest offer i got was $1,700!

So being that lappings been ruled out, I need some help with trying to figure out where I can find a replacmwnt diff and what one ill need. By the looks of it, it has to be a r160 but im unsure what ratio i'll need.

Any help would be greatly appreciated.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Strange noise when taking throttle off in 2nd gear	steenler	Mechanicals	12	24-02-2011 09:49 PM
Strange Noise	Giddyup	Mechanicals	14	04-11-2009 10:31 PM
Strange Noise, left rear ..	RichX	General Subaru Discussion	18	28-11-2007 09:54 PM
Strange noise while turning?	Huy	Mechanicals	28	21-06-2007 05:05 PM
Another strange noise?	Huy	Mechanicals	10	24-12-2006 01:59 PM