05 Silverado Rear End Noise

[kenoking]

HELP” I purchased a 2005 Silverado long bed-regular cab with a vortec 4800 Eng. 3.23 rear axle April 2005. The truck has a clunk/popping noise in the rear end while accelerating at approx. 20 mph & sometimes when transmission down shifts to a stop. When I first took it to the dealer, they told me that the noise is normal & the truck was operating under normal parameters.

 

I became very frustrated and called GM customer service. Customer service contacted the dealership to address my concern and get all the information from them. Customer service called me the next day to review the problem & asked me what would make me satisfied. I told the GM customer Service rep that I want it fixed or replace it.

 

The next day the dealership called to tell me they have a fix “replace the prop Shaft with a new loaded one.” After they installed the new loaded prop shaft & test drove it, the same noise reappeared.

 

Any help would be greatly appreciated.

[Mr. Smith]

  HELP” I purchased a 2005 Silverado long bed-regular cab with a vortec 4800 Eng. 3.23 rear axle April 2005. The truck has a clunk/popping noise in the rear end while accelerating at approx. 20 mph & sometimes when transmission down shifts to a stop. When I first took it to the dealer, they told me that the noise is normal & the truck was operating under normal parameters.

 

I became very frustrated and called GM customer service. Customer service contacted the dealership to address my concern and get all the information from them. Customer service called me the next day to review the problem & asked me what would make me satisfied. I told the GM customer Service rep that I want it fixed or replace it.

 

The next day the dealership called to tell me they have a fix “replace the prop Shaft with a new loaded one.” After they installed the new loaded prop shaft & test drove it, the same noise reappeared.

 

Any help would be greatly appreciated.

 

<{POST_SNAPBACK}>

 

 

 

take it to a different dealer and drive it with the mechanic in it.

[kenoking]

The truck was taken to another dealership & they had no resolution except to contack GM customer Service, which I did. This was done prior to the Prop Shaft installation by the dealer I bought the truck from.

[kenoking]

I had Mechanics from both dealerships drive the truck & heard the noise. They reported their findings to the Service Managers.

[RED7218]

I agree with the dealer, Its normal. The axles are locking together to get more traction and unlocking to go around corners. Its called a limited slip differantial. Unless you own a CHEAP work truck you've probably got one. I think this is one of the really cool things about chevy trucks. You won't get a limited slip axle on a lot of F or D trucks. This is the reason your truck moves and while driving in rain or ice and the guy next to you is setting still. I think your owners manual tells you all about this. Trust me on this, Suburban (limited slip), SWB V8 5 SPD (limited slip), SWB V6 5SPD (open Diff). Both limited slip trucks made the clunk sound your talking about. The open diff truck does not. ( I wish it did.)

 

Other drive-line noise causes.

 

Anytime you have a gears or a slip yoke you have to have a small amount of clearance. This includes: axle splines, spider gears, ring and pinion gears U joints (2 or 3 in your truck) a slip yoke, all of the gears in the transmission, the torque converter or clutch. This clearence adds up. The more gears or yokes in the drive line the more lash. On excelleration you should not be able to feel this lash unless you have a manual trans and don't shift smoothly. The only way to totally remove this lash would be to bolt the wheel directly to the crankshaft, impossible.

 

The longer the driveshaft and more torque the more "driveline wind-up". The drive shaft stores energy like a spring. All drive shafts do this. You said it was a long wheel base, right.

 

You can feel the effects of both of these by holding transmission in a low gear, lightly excellerating and quickly taking your foot off of the gas pedal. The springy forward and backwards jerking motion is driveline wind up. The clanking sound is lash. People Have been complaining about this since somebody in the late 80's decided that a unloaded pick-up ,somehow, should ride like a Caddy.

[RED7218]

0

[Vader]

I agree with the dealer, Its normal. The axles are locking together to get more traction and unlocking to go around corners. Its called a limited slip differantial. Unless you own a CHEAP work truck you've probably got one. I think this is one of the really cool things about chevy trucks. You won't get a limited slip axle on a lot of F or D trucks. This is the reason your truck moves and while driving in rain or ice and the guy next to you is setting still. I think your owners manual tells you all about this. Trust me on this, Suburban (limited slip), SWB V8 5 SPD (limited slip), SWB V6 5SPD (open Diff). Both limited slip trucks made the clunk sound your talking about. The open diff truck does not. ( I wish it did.)

 

Other drive-line noise causes.

 

Anytime you have a gears or a slip yoke you have to have a small amount of clearance. This includes: axle splines, spider gears, ring and pinion gears U joints (2 or 3 in your truck) a slip yoke, all of the gears in the transmission, the torque converter or clutch. This clearence adds up. The more gears or yokes in the drive line the more lash. On excelleration you should not be able to feel this lash unless you have a manual trans and don't shift smoothly. The only way to totally remove this lash would be to bolt the wheel directly to the crankshaft, impossible.

 

The longer the driveshaft and more torque the more "driveline wind-up". The drive shaft stores energy like a spring. All drive shafts do this. You said it was a long wheel base, right.

 

You can feel the effects of both of these by holding transmission in a low gear, lightly excellerating and quickly taking your foot off of the gas pedal. The springy forward and backwards jerking motion is driveline wind up. The clanking sound is lash. People Have been complaining about this since somebody in the late 80's decided that a unloaded pick-up ,somehow, should ride like a Caddy.

 

 

This reply is somewhat down the road but for anybody doing a search for this info, as I did, I have an alternate explanation.

Although there is driveline wind-up, there is an additional noise that sounds like a thump, not the normal metallic clink or clunk. It was driving me crazy trying to locate where the noise was coming from. I finally discovered the origin.. It was the yoke on the driveshaft. 2004/2005 models, I have since discovered, seem to have a problem with the splines being dry and the load causes the splines to lock and then suddenly release, creating the thump. I solved my problem by putting high temperature never seize on the splines. Other sites recommend putting tranny oil on the splines regularily or a replacement yoke be purchased to replace the stock yoke. Would have thought there would have been a recall for this but because it's not safety.. it's just an oh well!

Hope this helps.