Got a ticking sound coming from frnt of truck and when I was up under it I had someone put it in gear and the front drve shaft was clanging bad and noticed that the u joint was bad and but when im doin maybe 5mph is clanging really bad so m wonderin if I take it out and replace u joint on it if that clanging will go away
SOURCE: 2001 chevrolet silverado z71
replace the front u joint. I had the same issue with my truck, and I noticed that the front u joint didn't come stock with a greese zerk, the oem replacement does so they wear out fast. by the time I found it, it still looked ok till I removed the drive shaft....It was very close to wearing through.
SOURCE: 2001 CHEVY SILVERADO 5.3 Z71 The truck uses 1 gal of antifreeze
check for a wet tailpipe,which might indicate a leak between water jacket & combustion chamber.i.e.headgasket.check heater hose isn't leaking onto exhaust manifold,'cooking' the anti-freeze as it leaks.
SOURCE: squeeking\squeeling noise from under my 2001 chevy silverado z71
check your ujoints may have a bad one.
SOURCE: I drove my 1994 z71 truck through a creek and now 4x4 doesn't wrk
On the full size, the front actuator is electric, not vacuum.
When in 4wd mode, a switch on top of the transfer case conducts 12
volts out to the actuator. Wire #50 (brown) is the 12v feed, and it
conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.
Check voltage at the connector for the front actuator (at the
front differential - it looks like a large bullet that threads into the
front diff.) If it has 12 volts, the actuator is the problem. If it
does not have 12 volts, check the transfer case switch and the power
feed to the transfer case.
I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated
by voltage. When it heats, the pin in the end swells and pushes a shift
fork in the front differential. The shift fork engages a spline on the
passenger side of the differential, and boom! you have 4WD.
GM offered an upgrade to this actuator that is a motor instead of a
heated device. However, it requires a small harness addition, a spacer,
and a new actuator. It is about a $150 to $200 option.
If I were you, I would buy a new heated actuator. They are available at
most auto parts stores, and are about $90. They are also on eBay for
about $55 plus shipping. These are very easy to change - just thread out the old one, and thread in a new one.
Good luck, That actuator is usually the problem 90% of time.
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