SONNAX 2882120K
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$109.79
Price
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$0.00
Core
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+ Sold in packs of 1x1
Pack
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$109.79
Total
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Supported Servo Master Kit |
Conventional GM Powerglide servos are not well-supported and the return springs do not function properly, both leading causes of band failure. Sonnax supported servo master kit 28821-20K is an all-in-one kit that eliminates piston binding and includes a race-calibrated spring to counteract the pin bias effect.
At high apply pressures or with a worn servo pin bore, the servo piston is side-loaded in the case, causing friction and binding of the piston. The supported pin design of this Sonnax kit eliminates friction caused by side-loading and ensures the servo piston will apply and release without binding.
"Mystery" band failures are a common result of aftermarket servo return springs and weak OE springs prone to collapse that do not reliably release the servo. The Sonnax spring in this kit is race-calibrated to ensure consistent servo function for longer band life and a cooler transmission. The spring's higher seat pressure helps ensure full servo release, but also features a lower spring rate to prevent excessive release force in the apply position.
Features & Benefits:
- Unique cover and pin combination eliminates piston binding that causes unexplained band failure
- Race-calibrated spring counteracts pin bias effect up to 275 psi
- Dual PTFE seal rings for better seal and low friction
- OE apply area
- Low-profile design ensures adequate clearance
- 6061 Anodized billet aluminum cover
Contents:
- Supported Servo Cover
- Supported Servo Pin
- Servo Piston
- Return Spring
- Retaining Clip
- Gasket
- Cover O-Ring
- Pin O-Rings (2) 1 extra
- Drain Plug (not shown)
- Bolts (3) (not shown)
- Pin Shims (2)
- Spring Shims (2)
- PTFE Piston Seal Rings (2)
![](/Images/MoreInfo/doc.png) Additional Resources Installation Instructions
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SONNAX Warranty Information:6 months |
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