taking off from a stop issue

[bucannon]

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

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

what could my issue be?

[tlawre87]

Have you checked your U-joints or pinion bearing?

[geezer#99]

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

[bucannon]

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

[willett]

Check your slip yoke. They often cause slop from takeoff

[bucannon]

Originally Posted by willett

Check your slip yoke. They often cause slop from takeoff

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

[willett]

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.

[Oldriginal86]

What transmission and transfer case do you have?

[bucannon]

Originally Posted by Oldriginal86

What transmission and transfer case do you have?

700r4 trans

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

[walkerb]

Engine mounts? Might be rocking.

[bucannon]

Originally Posted by walkerb

Engine mounts? Might be rocking.

They have been replaced recently

[INSIDIOUS '86]

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

[bucannon]

Originally Posted by INSIDIOUS '86

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

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