2004 Z71 Strange noise

[dunner1]

Originally Posted by drewfus

Please help, I have a soft honk like sound that comes from the truck when I roll on the gas at the lower rpm of the (auto) shift. As the trans shifts to second like in a turn or up a hill the sound will bellow and hold during those RPMs. Seems to be coming from the passenger side of the truck. Local dealer has had it for 2 weeks and this is the third time in for it and they cant figure it out.........anyone out there heard off this one?

PS: according to GM what is a lemon truck?

I had a similar sound and couldn't find it. Have the dealer check the Trans fluid pump, mine was clogged they attempted to replace it only to find rear planetary gear was shatterered, however I didn't notice untill after they replaced the pump and started to move the pieces around and they scored the inside of the housing..result entire new transmission..on them. They could not find a housing for a trans rebuild,so they put in a new one..Thanks GM

[drewfus]

hmmmmmm interesting.....well I have GM Dealer #2 taking a look at it again this week. GM Attempt #5, I will mention that to them.......

[gmtech]

Have had exhaust moans/buzzing noises usualy less than 2000 rpms and can ususally make it happen by power braking it lightly to make the noise happen and if you can make it happen have someone else step on the tailpipe to see if the noise goes away. there is bullitens for this concern and it involves putting dampeners on the exhaust