5ktq massive vibration from rear 20-40mph

[Ado Sigal]

Power transfer is usually to blame for those symptoms not the diff. 
Anything relating to diff problem would show as a permanent diff whine 
at speed, bearings emit same noise as wheel bearings, so this can't be 
moving the whole car into the shake you describe. The diff leak might be 
the indication of the side that is vibrating. To eliminate the prop, 
disconnect it and try, but to me it sounds like a dry CV. Does it go 
away at speed?

Ado

Grant Lenahan wrote:

>I dont know, But at first I thought "bent wheel" . Then you said "up on 
>jackstands".
>
>I next thought - diff? Nah. How wouldd I test?
>
>I'm thinking diff.
>
>Grant
>
>On Oct 2, 2006, at 8:16 AM, Kurt Deschler wrote:
>
>  
>
>>I am trying to isolate the source of massive vibration from the rear 
>>of my
>>5ktq. The problem is definitely dependant of wheel speed, not engine 
>>speed
>>and comes on hard and fast at 20mph. Problem also occurs with the rear 
>>end
>>up on jacks. I tried adjusting the prop shaft bearing and geasing the
>>U-Joint and neither helped. I have also ruled out the brakes. Could the
>>rear diff be bad? It used to weep fluid so it is possible it went dry. 
>>The
>>vibration reasonates the entire back of the car and is enough to rattle
>>your teeth out.
>>
>> 	-Kurt
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