New ujoint front/rear, rebalance DS on 2006 silveradp reg cab. I still feel vibration when high speed only. When you go 80-90 start vibration. It getting frustrating. I went back to driveshaft shop. Gave them ride says wheels issues, transmission mount?/ I rebalance wheels most .75-1.00 weights on all wheels. Replace new trans mount. I did swapped 60e to 80e. Still doing that. So they rebalance shaft it look good. I don't understand why! Shaft is stock I only changed 4l60e to 4l80e yoke fit on stock steel shaft. Yoke itself size is 5.563 inch length. Any idea how to solve the problem for high speed vibration.

 

Should have a better DS honestly

 

what kind ds alum? or stick with steel. I may call dennys driveshaft.
But I checked trans tail housing to yoke a little playing. Maybe bad bushing inside tail housing. May caused vibration?

 

Stock juat isnt meant for any kind if power...iymts very thin material referring to stock steel ones

 

kinda shock after I spoke on dennys shaft company. They says wouldn't make shaft for our silverados???? Now I don't know where other best oppiunty.

 

Im in contact with them now

 

There's nothing special to making a driveshaft.

5" Al or 3.5" steel with spicer solid 1350 ujoints and billet yokes for big power

 

Some use chromo
Some use DOM
Some use EWS

So some various options

 

Ironic thread. I was measuring up for a new driveshaft from Denny's. That explains the discrepancies on their forms.

 

I just did the numbers and if read form right it was 63.375 for total length...that isnt there center to center