This Service Pack is for the OBX Limited Slip Differential (LSD) for 1994-1997/1999-2005 Mazda Miata 1.6/1.8L with AT/MT Transmission. Includes six Upgraded Belleville Washers and nine 45mm Case Hardened Cap Bolts. A "MUST DO" when installing any OBX LSD.
As we all know the belleville washers in the OBX diff seem to be cheap and prone to cracking. They won't stop the diff from working if they crack but they will no longer preload the axle and things are likely to be very noisy...
These washers really need to be replaced. When we say they are poor quality we mean it... We have heard of them arriving DOA cracked all the way through. We have tested them with a 2lb sledge by smacking one of the originals and it broke on the first medium impact swing. We could even see the grain in the metal where it cracked! We tested a replacement by smacking it 10 times in a row with increasing force and only slightly bent it.
The Bottom Line here is Original OBX bolts and washers are the weak link. Replace these before you install the unit. Don't wait until they break possibly causing extensive damage.
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