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Little vibration, can't pinpoint


Guiys427's Avatar
CF Beginner

Join Date: Jun 2017
Posts: 5

June 17th, 2017, 1:37 PM   #1  
Little vibration, can't pinpoint

Hi all, newbie with a question.
I have a 1998 Silverado 5.7L rwd w/90,000 mi(140k), I've had this vibration- starts up around 25mph/worst @ 40 and still there, but less noticable on the hway.....since I bought it used a year ago.
In attempts to resolve I've done the following: full rear brakes( it needed) full front brakes and new bearrings, New tires(balanced) rebuilt drive shaft(2 part) and balanced both pieces( new center bearring and u-joints.
Things are still the same. Also checked the rear axles in case of a bent one, both are good.
Vib is there weather I drive in other gears, in curves, in neutral acc. and deccel.
If anyone has experience with this and willing to share info, it would be great ...Next, tearring into the diffy( pinion bearring ?)

Thank you
G.


Last edited by Guiys427; June 17th, 2017 at 1:41 PM. Reason: typo
 
tech2's Avatar
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Join Date: Mar 2011
Posts: 5,368

June 17th, 2017, 1:40 PM   #2  
pinion gear is loaded and unloaded during accelleration/decell so is it more noticeable when accellerating?

 
Guiys427's Avatar
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Join Date: Jun 2017
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June 17th, 2017, 1:50 PM   #3  
No, the same accel.- decel, - coast in neutral

 
Guiys427's Avatar
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Join Date: Jun 2017
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June 17th, 2017, 1:53 PM   #4  
Also aligment done, tesetd with 2 spare wheel/tires, running out of ideas

G.

 
tech2's Avatar
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June 17th, 2017, 2:08 PM   #5  
at this point you may want to consider using this app

the price you pay for the app probably will save the cost of diagnostic charges or shot gun diagnostics. a factory tool cost upwards of $5000

 
Guiys427's Avatar
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Posts: 5

June 17th, 2017, 3:44 PM   #6  
Tk's Tech2, I will look into it.
In the meantime, it has been suggested to check the tranny mount( little soft and moves a bit) but not certain how much is too much, but fast and cheap to change.
Also, someone mentionned the extention shaft bushing. There again, not certain how much play is too much, also an easy R&R on the 4L60e.

G

 
Guiys427's Avatar
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Join Date: Jun 2017
Posts: 5

June 19th, 2017, 5:45 PM   #7  
UPDATE

After inspection, I found the original transmission support to be soft with a fair amount of oil and grease on it, decided it has given enough. Instaled a available replacement, result: vibs are still present at the same intensity @ 40mph but much WAY less noticable at higher speeds.(50mph+)
If this helps anyone think of something....let me know. Thk's for the imputs!
Tech2, I did look into that app. but finding it a little steep for my pocket at this time, for a one time use but thank you for the lead.

G

 
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