boost valve kit sonnax 4l80e 4l85e mt1 mn8 Transmission_AF23-5 VAN/WAGON 1987-1990 4 SP RWD

VAN/WAGON 1987-1990 4 SP RWD L4 2

Bushing Kit (16) CD4E LA4A-EL LA4AEL

the separator plate may also be worn out or damaged

Transmissions: AX4N (4F50N) 1991-UP

E6TZ-7D034-A

boost valve kit sonnax 4l80e 4l85e mt1 mn8 Transmission_AF23-5 VAN/WAGON 1987-1990 4 SP RWDBoost Valve Kit 4L80 E, 4L85 E From Sonnax Compatible with '91 later units featuring a factory style sleeve (no O rings). Can also be retrofitted to '89 91 units. GM 4L80 E and 4L85 E transmissions in various vehicles are often plagued by issues such as uncontrollable line rise (surpassing 500 600 psi), excessive line pressure in Reverse, buzzing noises, fractured direct clutch drums, and or damaged cases. A common root cause of these issues is the