Diff ?

[sho_shane]

Ok I have a 85 AE86. The diff is wining alittle, I wanted to know if you can change the oil back there and if you can how to do it? Thanks for any and all help.

[cannabolic]

yes you can change the oil. You have to check whether u have an LSD diff or not(you need that info, buying diff oil).

[AshCampbell]

lift your rear up and turn the wheels, if both wheels turn in the same direction you have an lsd....

[sho_shane]

I have LSD, I know that cus when i burn out it spins both wheels

[sho_shane]

How do you swap out the oil?

[cannabolic]

there's a tap under the diff. Warm up the diff oil by driving, this helps to drain the oil. you fil the diff through the level check plug.

[Ivan141]

Changing the oil rarely ever cures ring and pinion whine.. but it's worth a try.
Too much burnout's and clunky drifting will do that to an old ae86 diff..

[Lipinhu]

Sorry to use this topic, but i have some similar problem. My ring and pinion arent perform correctly. Theres some backlash when driving in low rpm´s and changing gears, when on full gas, seems good. I was wondering if a new spacer "virtually" fix my problem. I mean virtually, assuming that ring and pinion are in reasonable shape.

[Ivan141]

You might be better off re-checking the adjustment of the ring and pinion before you get yourself a new spacer.. installing a new spacer means disassembling a lot of the pinion assembly. If it's not aligned correctly, then a new spacer wont help either.

[Os7213]

Yes I suggest to re-check the ring and pinon backlash.
Check the pinion preload and you will know if you need to change spacers(in 90%+ of case no!)
After check carefully the contact path and you should be good.

Also for lsd diff I highly suggest Silkolene BoA90 ls oil.
I have compare it with many hypoid oil and this one is the winner in every spec.