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Differential Fluid change
Changed the fluid in my 10 bolt GMC differential on the 67, it looked 45 years old.
The truck is running a lot smoother now.
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'67 K-20 longbed 4X4,
350, SM-420, Vortec heads,
flat top 4-brow pistons,
Eaton 4.55's, Qjet,
MSD 8365, Comp XE250H,
Dynomax duals
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