Ive been having a little issue with my 93 pickup. My pickup has been having vibrations when exiting or slowing down on the highway. Its been like this for a while but not this bad. It feels like it might be the front but im not 100% sure.

When slowing down between probably 70-40 mph my truck shakes, this is when in gear and in neutral coasting. When its shaking if I give it gas it goes away until I let off the gas. I have the front hubs unlocked and the rest of the truck is stock.

Any ideas on what it could be?

 

Check your dshaft u joints. Under load they stay tight, when you let off they get sloppy.

:wabbit2:

 

Agree. First place I'd check too. While your under there, grease every zerk you can find.

 

Alright ill take a look at that this weekend

 

U-joints possibly, also check for play in the splines that allow the driveshaft to expand & compress.

Next would be transfer case output & the pinion, there will be evidence of oil leaking if either of those are worn out...

 

My 4 Runner is doing the exact same thing, i'm 99.999% positive it's my transfer case... it really sloppy.

I'm at least replacing the bearing/seal but I have a good T-case I may just put in for now and rehab/rebuild the bad one for a dual setup in another project or something.

 

Particularly, look at the u-joint at the rear of the transmission.

 

Mine is definitely the output shaft... I can grab it and see a lot of movement. The other T-case I have is solid, no slop whatsoever, I thought it was u-joints too till I took a better look.

I'm feeling some of these same vibes in my '88 too but it's very mild and didn't start until I had to put another tranny in it so i'm thinking it may have the same problem. The '88 is about to undergo a major renovation, motor/trans, paint, interior, suspension, etc., as soon as I build my shop so it's low on the to-do list right now.

 

Alright so I finally had a chance to take a look at it. I noticed that there is some play on the driveshaft at the u joints.

I dont really know too much about driveshafts since I havent had to deal with them before.

What can I do to fix this? Can I unbolt it and take it to a shop and get it fixed or should I just find another one in a wrecking yard?

 

U joints are cheap and easy to replace with pretty minimal tools. Or a driveline shop will change them relatively in expensively too.

Chances are one from the boneyard needs new joints too.

 

Oh alright. I guess I will have to figure out how to do it. Thanks alot Fraser

 

I had the same problem, I changed out the u joints, but the culprit was a loose output flange.