5ktq massive vibration from rear 20-40mph

[Kurt Deschler]

I took another look under the car today and found that the left side diff 
output has significant radial play. I have a spare diff handy so it looks 
like I will be doing the swap.
 	-Kurt

On Mon, 2 Oct 2006, 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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>
>
>