Printpartsummary
Symptoms:
  • Broken parts due to excessive line pressure
  • Erratic line pressure
  • High line pressure
  • Restricted converter/lube flow
Cause:

Excess pressure regulator sleeve wear allows fluid loss and/or causes valve hang-up, preventing normal line pressure control.

Correction:

Restore appropriate line pressure in all ranges by installing wear-resistant Sonnax pressure regulator sleeve.

Video

ZF8HP45, ZF8HP55, ZF8HP70

Pressure Regulator Sleeve

Part No.

35740-03

Pressure Regulator Sleeve
  • 35740-03_combo

  • Pressure Regulator Sleeve

Small_35740-03_combo Small_35740-03

ZF8HP45, ZF8HP55, ZF8HP70

Pressure Regulator Sleeve

Part No. 35740-03

Complaint:

  • Broken parts due to excessive line pressure
  • Erratic line pressure
  • High line pressure
  • Restricted converter/lube flow

Cause:

Excess pressure regulator sleeve wear allows fluid loss and/or causes valve hang-up, preventing normal line pressure control.


Correction:

Restore appropriate line pressure in all ranges by installing wear-resistant Sonnax pressure regulator sleeve.

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

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

  • Test Locations

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Valve Body Layouts

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

Valve Body Layout ZF8HP55
Valve Body Layout ZF8HP45, ZF8HP70
 

Sonnax Webinar Part 1 of 2: Dodge TorqueFlite® 8 (ZF8) Features & 2015 Challenger Test Drive

Watch this webinar recording to learn about:
  • 2015 Dodge Challenger SXT Plus features
  • Test drive in automatic & manual modes
  • Torque converter application strategy & pressure specs
  • Transmission theory of operation and clutch & brake application charts
  • Solenoid & valve body theory of operation & component breakdown

View presentation slides

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