700r4 vibration

[Rusty1]

I've had Rusty for several months now and have repaired and changed several things. One thing I have not addressed is the trans? vibration.

The truck runs great and smooth. The first time I drove it I thought it died at a stop sign because I couldn't here it or feel it running.

The problem I have is when I start from a stop. There is a vibration when the RPMs are up and the trans is in 2nd gear. As soon as it shifts it stops. I can run down the freeway in high gear and its smooth. There is no knocking or ticking from the engine. Bad Converter? anyone else had a problem like this?

 

[bucket]

That's odd. I'd guess it's the trans, but really I have no clue.

 

[philjafo]

I once had a speed and rpm sensitive vibration on a 2*4 truck with a 400 trans, wound up being a bad transmission mount. It looked fine on the outside but the rubber had separated from the metal part. Might also check the u-joints, missing balance weights on the shaft, and maybe disconnect the rear u-joint and rotate the shaft 180*. But those are usually constant vibrations. Might check the engine mounts too.

 

[crazy4offroad]

Sounds like a planetary going out or a cracked apply piston, or something up with the forward clutch pack. Keep an eye on your fluid color, any brown/black color or shiny metal particles I would take it off the road before a catastrophic failure occurs.
http://pages.suddenlink.net/crazy4offroad/storage/TH700R4_4L60E_Schematic_Parts12.pdf

 

[89Suburban]

 

[philjafo]

Have you found the source of the vibration yet?

 

[Rusty1]

Sorry Guys

Have been working on my Nova project. Haven't had a chance to dig in to the trans on Rusty yet. It still drives fine but if it blows I will figure it out the hard way. I have family in town this week. May be a while.

I promise you'll be the first to know when I figure it out.