Service Pack for OBX 420A Limited Slip Differentials. Includes Upgraded Belleville Washers and Case Hardened Cap Bolts. A "MUST DO" when installing 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 I say they are poor quality I mean it... I have heard of them arriving DOA cracked all the way through. I tested them with my 2lb sledge by smacking one of the originals and it broke on my first medium impact swing. I could even see the grain in the metal where it cracked! I 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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