how would i know for sure it is the driveshaft

 

It is a driveshaft for sure not probably a driveshaft. Go pull your stocker at a minimum and get it high speed balanced and the u-joints checked or bite the bullet and get one built.

 

Build one...the stocker is crap. Also when did you do the gear swap? Those gears and that ticking time bomb doesnt go together very well.

 

What gear was it in? Did you go wot or roll into it?


Try just slightly rolling into the throttle to the same speed.

I had a vibration that would only happen at WOT at around 80mph. Cruising up to 80mph+ i had not vibration. What was causing mine was worn out rear suspension parts allowing the rear end to rotate and causing the pinion angle togo extremely positive.

 

I had a vibration that didn't show up until about 40+ and it got worse as speed increased. Mine was a driveshaft... to be fair though, I had also broken a slip yolk and sent the driveshaft flying into a ditch prior to that.

 

I did the gear swap in June this year and i just put 4.10s in it. And it does it rolling into it and going WOT thats why i didnt know what it was

 

like it feels like the driveshaft is out of balance for sure. where is teh best place to get a built driveshaft

 

fix the driveshaft. balance it for get a built one before you lose the stocker.

 

Driveshaft specialist of Texas was great to me and I have recomended them several times. I would bet your driveline angles are off after that 4/7 drop too though, so you need to look into that while your under it.

 

how do you even correct for driveshaft angle is that just the positiion of the axle