Sonnax Line Pressure Booster Kits 28999-01K

Name: Sonnax Line Pressure Booster Kits
Brand: Sonnax Transmission Company
SKU: SOX-28999-01K
Price: 37.99 USD
Availability: InStock
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Part Number: SOX-28999-01K

$37.99

Sonnax Line Pressure Booster Kits

Boost Valve, Low/Reverse, GM, Powerglide, Kit
See More Specifications | Check the Fit

Sonnax Line Pressure Booster Kits 28999-01K

SOX-28999-01K

Not Yet Reviewed

Part Number: SOX-28999-01K

Estimated Ship Date from Texas: Monday 10/26/2026

$37.99

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Overview

Applications

Q&A

Estimated Ship Date from Texas: Monday 10/26/2026 Would you rather pick it up?

Overview

Brand:

Sonnax Transmission Company

Manufacturer's Part Number:

28999-01K

Part Type:

Automatic Transmission Boost Valves

Product Line:

Sonnax Line Pressure Booster Kits

Summit Racing Part Number:

SOX-28999-01K

Remanufactured:

Transmission Valve Type:

Low/Reverse boost valve

Boost Valve Diameter (in.):

0.489 in.

Quantity:

Sold as a kit.

Notes:

Includes valve and sleeve.

Sonnax Line Pressure Booster Kits

Sonnax Line pressure booster kits allow you to shift aggressively and then feel the tranny grab the clutches with more power when it changes gear. The larger boost valves and matching regulator springs raise line pressure progressively as higher pressure is commanded. These kits modify the sensor signal, which causes the computer to create a pressure increase. They're installed between the pressure sensor and vehicle harness using OE-style sealed connectors; no modifications are needed to the transmission.

Applications