Hi guys, after spending some time on the internet and reading through pile of post about knocking in the rear diff I decided to ask you about the backlas, I've been told by a Subaru specialist where I took a car for check up that it's normal and there is nothing to worry about, what's your thoughts?? There is about 5-6mm play on the rear diff, here's the link to the youtube where you can see what I'm talking about. Thanks

 

Just forgot to add that the clunk can be heard when on and off the gas especialy in the low gear ie crawling in the traffic

 

If you have the wrong gear oil in the diff the clunk can be louder ie 75/90 and changed to the right 90ls oil be it fuchs or mutual what its says in Jdm owners manual for rear diff and the clunk is very quiet now .

 

I did changed all oils when I bought the car and I used Motul gear 300 75w/90 for diffs and gearbox, is that wrong grade ?What oil should be used then?

 

you want a specific LSD oil in the rear of that car.........

we carry various options in stock depending on exact use, wether road, track, competition, etc........

 

It's a road use car, unfortunately I can't read japanese so owner manual didn't gave me info on what oil to use but I read here that 75w/90 will be ok to use on cars with dccd unles there's difference ilbetween jdm and uk dccd cars?
So what grade should I use for jdm dccd to reduce the clunk?
Thanks

 

I have backlash in my spec c, just got used to it

 

It seems that I'll have to do the same what oil do you use in the diff?

 

Its 90 ls oil what I said in my above reply to your post and says in the maintenance note/service book lsd 90 and I mentioned fuch or mutual do a 90 ls oil .I did the 75/90 in the rear diff and the clunk was louder .Put in the right oil 90 ls and diff is quiet now .This is in a 05 Jdm Sti impreza that I have

 

Thanks Dipsy, I was trying to get 90 ls yesterday but with no luck so I just ordered one online, as soon as it arrive I'll change it and give an update, hopefuly the clunk will be recuded .
Thanks

 

Oil changed today for Fuchs racing gear 90ls and ther's still clunk, it's not that loud/metlic though