28821-09K Powerglide Super Hold servo piston kit Sonnax 28821-09K

Features

Sonnax super hold servo assembly 28821-09K dual piston design has 30% more apply area
than the original servo. The patented design fits completely inside the case; external cover
clearance is the same as original servos. The larger apply area will increase band apply force at
your current line pressure or allows you to reduce line pressure by 20% to 30% while maintaining
the same apply force. Improved sealing throughout reduces fluid loss and is optimized
for low friction movement. Powerglide servos have some residual apply pressure in high gear
when the servo is released. At higher pressures this residual pressure can overcome the return
spring, resulting in the band not releasing fully, robbing power in high gear and burning the
band. The return spring in the Sonnax servo is tunable, to ensure full servo release even at
higher line pressures.

	36630 2004R Transmission Front Direct Drum Bushing. $2.24
	77898EK 4L60E,4L65E,4L70E EARLY DESIGN VALVE ASSY, REV BOOST O/S $35.84
	35882 700R4 4L60E Transmission low roller sprag 1987-on $17.96
	35559K 700R4 4L60E 4L65E Transmission Kolene overrun steel plate. $7.50
	35563 4L60E Transmission 3-4 steel plates 1995-2003. (0.106") $4.29
	35013 4L60E Transmission banner kit 1992-98. $125.34
	35995B 700R4 4L60E 4L65E Transmission 2-4 band, $23.18
	35560 700R4 TH250 4L60E 4L65E Transmission low reverse clutch plate. $2.95