2003 Chevrolet Silverado 1500 4WD engaged at high speed
My wife drove my 1500 4WD Chevrolet Silverado in excess of 45 MPH while the 4LO (down arrow) was engaged. She drove my truck all day. I haven't had a chance to drive my truck. I need advise what to look for and what kind of damage, if any, was done.
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Re: 2003 Chevrolet Silverado 1500 4WD engaged at high...
Have a complete service done on your truck. When your fluids are changed, have the technician look for metal particles in them. While some are common, if a lot are present, it may indicate sever wear. I would look for this especially in the engine oil. Though I doubt any damage was done, that was for sure very stressful on your truck. I didn't know that a truck would go that fast in 4low. Also watch the behavior of your transmission and engine. Your transfer case should be shifted a few times too.
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sounds a little like a cruise control problem. they used to have a centering adjustment that kept the speed within a range. If the range somehow shifted to the high end this would cause your surge. it would be a screwdriver slot on the outside of the case.cw increase ccw decrease. yours is set too high or cw. I work the screw back and forth several times in case dirt entered the cruise module.
I HAD A BLAZER WITH THE SAME SYMPTOMS REPLACED THE TRANSFER CASE MOTOR AND SOLVED PROBLEM. TRANSFER CASE MOTOR SHIFTS FROM HIGH TO LOW GEAR IN THE TRANSFER CASE AND TELLS THE FRONT ACTUATORS TO INGAGE FRONT HUBS . MOTOR WON'T MOVE TO 4 HIGH AND GRINDS WHEN TRYING TO MOVE TO 4 LOW, TRANSFER CASE MOTOR FAILING . CHECK VACUUM LINES AND ACTUATORS ON FRONT DIFF THEY FAIL, CAN CHANGE TO CABLE ENGAGEMENT INSTEAD OF FAILURE PRONE VACUUM ACTUATORS.
Are you sure that the actuator on the front differential is actually engaging? On my 99 silverado, the truck acts as if it is in 4lo when the button is pushed but the front wheels don't actually spin. Get on the ground and listen to whether or not the actuator engages.You should be able to hear it hum. If it doesn't then i would say it is the actuator which is common. Good Luck!
Make sure the fuel filter is clean. You may need to drive it with a fuel pressure gauge. Fuel pressure should be 55-62 psi. It its lower , the fuel pump may need to be replaced. Replace the fuel filter. Replace the filter every 10-15k miles.
It is somewhat Normal Depending on how Loud the Clunking is. This is a Common Complaint on the Chevy 4x4's. I have verified this through the Dealerships here in Oklahoma and they all say the Same thing But, I am with you, They should go into 4x4 without that Clunk for as much as we pay for them.