There seems to be a lot of confusion on what is used in the NV1500. The NV1500 uses Sychromesh with friction modifiers, not plain Sychromesh. Synchromesh and Synchromesh with friction modifiers are different fluids. GM recommends 88900399 (which replaces 12377916 and 10-1014) for the NV1500 and nothing else.
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