Sonnax 35740-03, ZF8HP70 Pressure Regulator Sleeve. Also fits ZF8HP45, ZF8HP55.
Vehicles equipped with ZF8HP45, ZF8HP55 and ZF8HP70 transmissions often develop erratic or high line pressure due to excessive wear in the OE pressure regulator sleeve. This wear allows balance oil loss, preventing proper line pressure regulation. Without correct balance oil pressure, the PR valve will be out of its desired position, resulting in line pressure instability and possibly restricting cooler and lube flow. Installing Sonnax pressure regulator sleeve 35740-03 renews pressure regulator action for revived line pressure control in all ranges.
- Manufactured from highly wear-resistant aluminum
- No machining or special tools required
- Harsh shifts
- Erratic line pressure
- High line pressure
- Restricted converter/lube flow
Excess pressure regulator sleeve wear allows fluid loss and/or causes valve hang-up, preventing normal line pressure control.
Restore appropriate line pressure in all ranges by installing wear-resistant Sonnax pressure regulator sleeve.