I bought a brand new shaft and took it to supposedly a good mechanic, but now when I accelerate I can hear like the tachometer motor going up and down in my dash. He told me that it could be the intake, but I do not have a check engine light or anything. I went to a local Chevy garage and he said that maybe the guy who installed it did not fit the shaft through the boot correctly, now I'm pretty much lost, please help me anyone?
I'm not sure of your exact problem from the explanation you gave in your question? Please be more specific with your details so I can understand what exactly the problem is.
Are you talking about the engine RPM's (tachometer)? Or are you talking about the speedometer?
Please describe the exact shaft you are talking about in your question. Do you have a split drive shaft, or are your talking about the intermediate shaft inside the transmission? Is the truck 2wd or 4wd? What size engine is in the truck? What exact model is the truck?
Get back to me with the information I requested when you can and we will go on from there.
Sorry I was so vague, I have the notorious knock in the steering assembly in my 2 WD Tahoe. I went and bought a new intermediate steering shaft assembly that I have had replaced 2x already. Supposedly Chevy now has a fix, but now I have an annoying noise that resonates in the dash or motor area, I'm really not sure. It also comes into play when I take a turn at slow speeds, ( I can hear it better then) coming from the same area and same high vibrating sound. I can hear it really good when I accelerate at low speeds and then take my foot off the gas pedal. It is really hard to explain what it sounds like, but I ride motocross bikes and can hear the transmission shifting and all the little motor noises. I went to the Chevy Dealer and they said that maybe the guy that replaced the shaft since he had to take it out from under the dash, did not put the boot back correctly to let the air escape from the boot?
As of the service bulletin from Chevrolet that I found on the Alldata information website, the noise may be coming from the lower steering column bearing.
It could give the same noise as the intermediate shaft, but you just changed the shaft which might mean the bearing may be bad. Below is part of the service bulletin that explains the noise you are experiencing. If you want the complete service bulletin, you can get it at ALLDATAdiy.com.
I hope this information helps you. If you need more assistance we will be glad to help.
Bulletin No.: 00-02-35-003N
Date: March 26 2008
Clunking Noise Under Hood and Can Be Felt in Steering Wheel and/or Steering Column (Replace Upper Intermediate Steering Shaft [I-Shaft] Assembly)
2002-2006 Cadillac Escalade Models
1999-2007 Chevrolet Silverado Models (Classic)
2000-2006 Chevrolet Suburban, Tahoe Models
2002-2006 Chevrolet Avalanche
1999-2007 GMC Sierra Models (Classic)
2000-2006 GMC Yukon, Yukon XL Models
2003-2006 HUMMER H2
Attention: This Service Bulletin DOES NOT include Mid-Size Utilities such as Buick Rainier, Chevrolet Trail Blazer Models, GMC Envoy Models or Oldsmobile Bravada. Refer to Service Bulletin 02-02-35-006A or newer for Mid-Size Utilities.
This bulletin is being revised to add diagnostic information (refer to Diagnostic Tips) to check the lower steering column bearing as a potential source of the noise. Please discard Corporate Bulletin Number 00-02-35-003M (Section 02-Steering).
Some customers may comment on a clunk-type noise coming from under the hood that also can be felt in the steering wheel. These conditions may be more noticeable when turning at low speeds on rough road surfaces.
Use the information below to help diagnose the source of the noise.
The lower steering column bearing may create the same noise as the intermediate shaft. Before replacing the I-shaft, verify the noise isn't being caused by movement from the lower steering column bearing. Check the bearing for movement by pushing up and down on the I-shaft where it attaches to the steering column.
Frame Snap and/or Popping Type Noise - A frame snap or popping type noise can be duplicated on rough or smooth road surfaces with steering wheel input to the left or the right. This type of noise can be HEARD and is typically louder with the windows rolled down. For additional information refer to Corporate Bulletin Number 03-08-61-002F or newer - Snap/Popping Type Noise Coming from Front of Vehicle (Remove Front Cross member Change Fastener Orientation).
Intermediate Shaft Clunk - Intermediate shaft clunk is heard and FELT in the steering wheel and/or steering column area typically while driving on rough road surfaces with steering wheel input.
Important: I-shaft P/N 19153614 has been designed to replace previous designed dampened and non-dampened I-shafts. The physical difference in the yoke size will accommodate all vehicles listed in this bulletin.
Due to the design of the new I-shaft, it is not possible to lubricate/grease the I-shaft.