Hi,
The 8.8" can be either locking or non-locking. The locking does require an additive. If that is what you have, add 4oz of friction modifier XL-3. I would actually suggest using it regardless.
If you want, I attached a pic below showing how to identify the differential.
Let me know if this helps.
Joe
See pic.
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Tuesday, March 1st, 2022 AT 8:04 PM