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B&M Shift Improver Kits

4.57 out of 5 stars 109 Customer Reviews

B&M Shift Improver kits are the easiest way to get the stout performance you've always wanted out of your automatic transmission. All you need are some hand tools and an afternoon, and you can turn your transmission into a B&M-tuned unit. Each kit has two stages to fit your needs: RV/Towing and Street/Strip.

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B&M Shift Improver Kits 20261

Transmission Upgrade Kit, Shift Improver, GM, TH400, 3L80, Each

Part Number: BMM-20261

5.0 out of 5 stars ( 5 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

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