taking off from a stop issue
 

When i take off from a stop, no faster than average motorist. I notice a slop in the drivetrain. I not only can feel it but hear a noise that i have a hard time describing in text.

My first thought is that is is the transmission cross member. I checked the mounts to the frame and it feels solid. I think I would have checked the bushing too but i cant remember. But were going to assume that i did.

this leaves the rear end, I have 3" lift blocks, stock springs. or the motor mounts, which I believe would be obvious under a rolling takeoff with hard acceleration:metal:

what if my cab mount bushings were shot, would that be what im feeling?

what could my issue be?

Re: taking off from a stop issue
 

Have you checked your U-joints or pinion bearing?

Re: taking off from a stop issue
 

With 3 inch blocks check the u-bolts and the pinion angle.
Here's a link on finding and curing vibrations.
http://www2.dana.com/pdf/J3311-1-DSSP.pdf

Re: taking off from a stop issue
 

I replaced the pinion bearing when right after i put this rear in the truck. didnt know it was bad until the first test drive... redneck on craigslist lied to me

I suspect the U bolts since it was an Autozone sourced block kit, and the u bolts dont look too beefy. In fact I have not adjusted them since installation, which I understand you are supposed to check them after a while.

currently I am out of state so keep the ideas coming in case it is something else

Re: taking off from a stop issue
 

Check your slip yoke. They often cause slop from takeoff

Re: taking off from a stop issue
 

what would i be looking for on the slip yoke? would i just grease it or what

Re: taking off from a stop issue
 

Try twisting it and pushing it up and Down WHILE NOT UNDER LOAD, it's often pretty hard to tell though without dropping the shaft and inspecting it on a bench. It doesn't take much to make a ruckus. The slip yoke is male and female splines that mate and slide back and forth on each other. They can get hammered out over the years. You could try greasing it but if its to the point of making noise, your probably looking at replacing it or turning the stereo up.

Re: taking off from a stop issue
 

What transmission and transfer case do you have?

Re: taking off from a stop issue
 

700r4 trans

dont have a transfer case, its a 2wd pre runner

Re: taking off from a stop issue
 

Engine mounts? Might be rocking.

Re: taking off from a stop issue
 

They have been replaced recently

Re: taking off from a stop issue
 

Check the spider gears and center pin in the diff. When worn and almost ready to die these can get very sloppy

Re: taking off from a stop issue
 

my gears are 4.10 and my posi is an aftermarket unit. it could be worn but would that cause the issue described?