what would you do

[91CoupeMike]

Surely you were going to already, but be sure to rev the motor a bit after you pull the driveshaft. No sense in pulling the tranny if it happens to be the shaft that's out of balance.

Why not just press the clutch with trans is gear to eliminate driveline issues without pulling anything?

The only thing you can't test with it all together is the pressure plate balance.

[Big A]

I'm on vacation next week so going to try to get the tranny backed off and see if it smooths out

Surely you were going to already, but be sure to rev the motor a bit after you pull the driveshaft. No sense in pulling the tranny if it happens to be the shaft that's out of balance.

[FRANCISCO308]

ATI, UTI, or Wyotech?

Lincoln tech

[naynay]

ATI, UTI, or Wyotech?

[TEAMJACOB]

I'm on vacation next week so going to try to get the tranny backed off and see if it smooths out

[jayjohnson600]

One thing to think about...
Are you sure it's not a vibrationbehind the motor?

I got a converter from my transmission sponsor(a while back) and put it behind a new
motor build(LS1 zero balance).
I thought the shake was in the motor, but it was the converter.
Isolated the issue by pulling back the tranny and converter, then rev'ed up the motor.
Motor was solid.

It turned out the converter was setup for my specs for stall and STR, but not
zero-balanced. I suppose a little extra weld bead on one side made the difference.

Check to see if you may have lost any balance weights in the drive train.

I've seen a balancer half way off, saw one that was separating, and I've seen drive
shafts with bad u-joints, and lost balance weights, lost bolts. I've seen balance flex
plates put on zero-balance motors, etc.

Get some eyes on everything and work to isolate the component that has the issue.

[onemeangixxer7502]

This is a good point, I kept breaking trans tailshafts only to find out my DS wasnt balanced

I had the same issue sort of but it was the driveshaft was rotated 180 degrees out and it would vibrate like motherfucker over 3-4k rpms

[TEAMJACOB]

Im hurt..

Lol sorry bro you don't post a whole lot. I know you. Just didn't associate the screen name.

[AIFOX]

Who is this?

Im hurt..

[Turbosvo]

Who is this?

That's David with the red hatch on cobras

[Txstang1]

have you checked the driveshaft bolts ? Worth a look.

[SEB]

I told you I thought it was drivetrain related. Had the same problem with my 93. Put a new trans in it and problem fixed.

This is a good point, I kept breaking trans tailshafts only to find out my DS wasnt balanced

[TEAMJACOB]

I told you I thought it was drivetrain related. Had the same problem with my 93. Put a new trans in it and problem fixed.

Who is this?

[AIFOX]

I told you I thought it was drivetrain related. Had the same problem with my 93. Put a new trans in it and problem fixed.

[TEAMJACOB]

i don't even know all the background, just find it strange that you edited his quote that said "we did not build the motor" and basically changed it to read "we did not build the short block".

My point was that either way it would not be their issue if the motor wasn't balanced. It's not like you can spin a motor over on an engine stand and tell that it isn't properly balanced, it is the fault of who ever built the short block or who ever told the person building the short block not to balance the rotating assembly.

My first post in here after the original text says this is my fault. Just leave it at that.