LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 1992 >> APV >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Overhaul & Testing - 125C/3T40 >> Testing >> Line Pressure Tests >> Notes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Line Pressure Tests: Notes

CAUTION: Parking brakes must be applied during test. Ensure test DOES NOT  exceed 2 minutes.
  1. Check ATF level, Throttle Valve (T.V.) adjustment and manual control linkages. See appropriate AUTOMATIC TRANSMISSION SERVICING article in the TRANSMISSION SERVICING section. Ensure engine is tuned properly.
  2. Connect tachometer to engine. Connect pressure gauge to pressure test port on transaxle case. Pressure test port is on bellhousing side, above valve body cover.
  3. Line pressure is controlled by pump output and pressure regulator valve. Line pressure is boosted by reverse boost valve in "R", "2" and "1" positions. Line pressure should increase with throttle opening in "N", "D" and "R" positions.