Sonnax 6L80-LB1 Line Pressure Booster Kit For GM 6L45, 6L50, 6L80, 6L90 Transmissions












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If you're pushing a GM truck, SUV, or performance car with a 6L45, 6L50, 6L80, or 6L90 transmission and want firmer shifts, better clutch holding power, or just more reliable line pressure, this Sonnax booster kit is a top-tier upgrade. Part number 6L80-LB1 (also listed as S104507F and 45507PBK). It's a brand new, performance-oriented line pressure booster valve kit that installs in the valve body. Helps fight off issues like soft shifts, slippage, or premature wear, especially in tuned or heavily loaded vehicles. Sonnax is the go-to brand for serious transmission builders. This is a universal-fit performance part for DIYers or shops looking to bulletproof these common GM transmissions. Tighten up your shifts and add some durability with this proven upgrade.
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FREE In store & Online Returns If for some reason, you're not 100% satisfied with your purchase, you can return or exchange quickly and easily in accordance with our Return policy. Some restrictions may apply.
PRICE MATCH Guaranteed JOHNABERNBAUM.ORG will gladly match the price on a qualifying item sold in store or online at a qualifying retailer. See details














