Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1990SUBURBAN R2500, 6.2 J, 475/M40REPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSOVERHAUL & TESTING - 700-R4/4L60TESTINGCONTROL PRESSURE TESTPRELIMINARY CHECKING PROCEDURE
1990 Chevrolet Suburban R2500, 6.2 J, 475/M40
Preliminary Checking Procedure
1990 Chevrolet Suburban R2500, 6.2 J, 475/M40SECTION Preliminary Checking Procedure
- Ensure fluid level is correct and engine is in good operating condition before performing control pressure test. Ensure shift linkage is properly adjusted. See appropriate TRANSMISSION SERVICING - A/T article in the AUTOMATIC TRANSMISSION SERVICING section.
- Control pressure can be checked to ensure proper throttle valve cable adjustment. If control pressure is not within specification, adjust throttle valve cable before attempting any other corrections. See THROTTLE VALVE CONTROL PRESSURE CHECK.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.