Mishimoto Transmission Cooler, Silver, fits Chevrolet/GMC 6.6L Duramax L5P 2020+
Fits 2020-2026 6.6L Duramax V8 (L5P) · 6.6L Duramax V8 (L5P, updated)
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Transmission parts here are about holding torque and keeping fluid temperature down, which is what kills automatics. This one is the Mishimoto Transmission Cooler, Silver, fits Chevrolet/GMC 6.6L Duramax L5P 2020+, listed to fit the 2020-2026 GMC Sierra 2500HD/3500HD with the 6.6L Duramax V8 (L5P) or 6.6L Duramax V8 (L5P, updated).
why this one — Towing heat is the usual reason to buy. Check what your truck already has before adding a cooler or pan. SDHQ Offroad lists it at $350.95, and the fitment above is what the listing itself states, not a guess.
No published gain figure for this part, and nothing here is a guarantee. Price is a list price and can lag the retailer; confirm at checkout. See our affiliate disclosure.