Weird droning sound

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dropshot1

dropshot1

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Maybe someone can give me some ideas,last year i replaced my driveshaft, had one made for the car from a reputable place , then i bought a new third member for my 8 3/4 , 3:91 posi, again from a reputable source , went through his breakin procedure to a tee. Installed the stuff last year but last night was the first time i attempted to take it on the highway, once i hit about 49 mph, crazy loud humming sound, hard to explain!sounds like something gonna let go
 
dropshot1 said:
Maybe someone can give me some ideas,last year i replaced my driveshaft, had one made for the car from a reputable place , then i bought a new third member for my 8 3/4 , 3:91 posi, again from a reputable source , went through his breakin procedure to a tee. Installed the stuff last year but last night was the first time i attempted to take it on the highway, once i hit about 49 mph, crazy loud humming sound, hard to explain!sounds like something gonna let go
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Get the rear end off the ground and find it.
First guess would be driveshaft.

I took my shaft to a recommended race shop and had it balanced to the tune of $150.
Guess what, it was still out of balance an amount that it still droned and vibrated the car.
 
I had a pilot bushing wear out and caused that problem, If the input shaft wobbles because of a sloppy bushing it will cause the tail shaft to run out of center and that will whip the drive shaft. I had my drive shaft balanced also and no difference then I dug deeper and found that.
 
Make sure the u-joints are seated correctly
 
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