Skip to content
Sonnax 104520-12K 6L45, 6L50, 6L80, 6L90 Transmission Pump Boost Valve Kit

Sonnax 104520-12K 6L45, 6L50, 6L80, 6L90 Transmission Pump Boost Valve Kit

by Sonnax
SKU S45507ATK
$21.43 - $21.43
$21.43
$21.43 - $21.43
$21.43
Availability:
in stock, ready to be shipped

Delivery time

You will receive your package in 2–5 business days within the contiguous U.S.

Brand: Sonnax

Type: Performance Pump Component

Interchange Part Number: 80289NK,45507ATK

Items Included: Boost valve kit

Manufacturer Part Number: 104520-12K

Material: Aluminum

Universal Fitment: Yes

Vintage Part: No

Performance Part: Yes

6L45, 6L50, 6L80, 6L90 Transmission

Boost Valve Kit
Part No. 104520-12K

Vehicles with listed GM transmissions may exhibit insufficient line rise in drive ranges, soft shifts and/or burnt clutches. These problems may be caused by continuous oscillation of the boost valve within the boost sleeve, creating excessive wear and a path for EPC fluid pressure to leak to exhaust. Sonnax boost valve kit 104520-12K has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control. The sleeve also has a slightly larger EPC feed orifice to provide quicker throttle response. A new pressure regulator valve outer spring is also included to replace weakened original springs and provides a modest 5 psi increase across the pressure curve.
  • Boost sleeve is manufactured from highly wear-resistant billet aluminum to prevent wear
  • Larger feed orifice provides quicker throttle response
  • Replacement spring provides modest 5psi line pressure increase
  • Drop-in Zip Valve™ parts install quickly and easily
  • Valve
  • Sleeve
  • Spring

Symptoms:

  • Low line rise in Drive
  • Soft shifts
  • Burnt clutches

Cause:

Wear of the boost valve sleeve allows EPC fluid pressure escape to exhaust.

Correction:

Sonnax drop-in boost valve kit has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.

Use this text to share information about your product.

Blog posts

See more