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Genuine Toro Spindle Housing Assembly 100-3976 – OEM Replacement For 99-3877, Mower Deck Part
About this item
This is the real deal—genuine OEM Toro part number 100-3976, spindle housing assembly.
It directly replaces the older 99-3877 version with no issues.
If your mower deck is wobbling, vibrating, or just not cutting clean, this is likely the culprit.
Solid build, exact specs, and it’s packed as a single unit ready to bolt on.
Whether you’re a landscaping pro or just take pride in your lawn, using authentic Toro parts means less downtime and better results.
No guessing, no returns because it didn’t fit.
Get your mower back to slicing grass like a razor.
Simple replacement, huge difference.USD$ 182.25 
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