Boost Valve Kit Powerglide
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SONNAXPART NUMBER: 852-28999-01K

Boost Valve Kit Powerglide

$3768
ShippingShips on 09/09/2026
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Boost Valve Kits
Boost Valve Kit
  • Powerglide

    • Valve
    • Sleeve
    The OE boost sleeve wears from repeated oscillation of the boost valve. The wear allows leakage, reduces line pressure and contributes to line pressure instability. Additionally, the original steel parts are also prone to rust damage in vintage valve bodies. Sonnax offers a replacement boost assembly, 28999-01K for the aluminum Powerglide. This high performance design is the largest factory size (.489" dia. at the small spool), and has a lengthened critical spool diameter to provide better hydraulic sealing capabilities.

    • Large boost ratio
    • Lengthened critical spools provide better hydraulic seal
  • Part TypeAutomatic Transmission Reverse Boost Valve
    BrandSONNAX
    Package Height1.0
    Package Width1.0
    Package Length2.0
    Weight1.95 PG
    Part CategoryReplacement Parts
    Boost Valve Diameter0.489 in (12.421 mm)
    Part FitmentSemi Universal
    Vendor Part Number28999-01K
    Package Qty1
    Package TypeEA
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    Some parts are not legal for use in California or other states with similar laws / regulations
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