Vibration at high speeds and broken Reverse friction plates occur in GM Powerglides when the poorly supported planetary ring gear moves off the transmission center line, oscillating out of control.

Ring gear stabilizer kit 25810-S3 installs easily on Sonnax bolt-together, 1.65 and 1.58 ratio planetary carriers. With proper support, the ring gear stays on-center, significantly reducing vibration and drag while preventing wear and short pinion gear stress.

• Fits Sonnax 1.65 and 1.58 carriers
• Reduces high-speed vibration and drag
• Prevents damage to short pinion gear teeth