mk2.5 S-VT Fuji diff rattling

[caelite]

Hey folks

So I have had my mk2.5 a few weeks, always noticed a very slight rattling/scrapping sound coming from the rear of the car whilst under acceleration, it sounds very much like a binding brake caliper but I know that is not the case. I put a hard top on today which actually made the noise more pronounced, I think because it mutes the exhaust slightly the noise coming through the transmission tunnel is a little more noticable.

Anywho, should I be worried? I know a lot of gearboxes and diffs make odd noises during operation.

The noise is very occasionally present on overrun and deceleration, is pronounced under acceleration, and very noticible under light acceleration whilst lugging the engine somewhat (pulling from ~2krpm at 35mph in 6th).

If it is bksed what is the bill likely to be? I know you get new clutch packs for these diffs, but no nothing of how much they cost or how difficult they are to fit, LSD really is new terratory for me as my entire car history prior to my MX5 have been warm/hot hatches with open diffed FWD.

Car is a late 2004 model with 100k miles.

[Deejbb]

I have a mk2.5 S-vt and have exactly the same thing, I first thought it might be a binding calliper but then thought that it might be the gearbox.. Doesn't really bother be but would be interested to hear what you find if you manage to get to the bottom of it!

[caelite]

Haha good to hear it 'might' he normal . I have read that the Fuji units are more delicate than the older torsen ones so it had me worried, I'm going to change the diff and gearbox oil, if the diff is damaged I doubt it will help but it certainly won't do any harm.

[TheVole]

I had the same noise on my 2003 S-VT from the Fuji diff - when you change the oil, if any bits of metal that look like this come out, it's knackered - you can get new clutch packs but I went straight to the TorSen LSD with the same final drive ratio. No issues with it yet!

[caelite]

TheVole said:

I had the same noise on my 2003 S-VT from the Fuji diff - when you change the oil, if any bits of metal that look like this come out, it's knackered - you can get new clutch packs but I went straight to the TorSen LSD with the same final drive ratio. No issues with it yet!
-snip-

Out of curiosity how much did you pay for your torsen? Havn't had a chance to have a look at my diff yet (it's rained constantly pretty much all month here in Glasgow & I have no garage), but just want a general idea of costs if it needs done.