Slight Thud accelerating at highway speeds

I purchased a 2002 Tundra a few months ago and have started to notice a thud when accelerating at highways speeds... mostly noticeable when starting to go up long hills.

I can't tell if the truck is actually downshifting, but it doesn't seem so as the RPM stay pretty consistent in the low 2k range.

Truck shifts just fine any other driving conditions.

Thoughts? Thanks!

Chris

 

Is your spare secured? If they loosen up they can thud about pretty readily.

 

I will check that, thank you for posting.

 

Have you greased your driveshaft? Particularly the rear propeller shaft. It telescopes to accommodate suspension travel, but also shifts from axle wrap under torque. Its normally filled with grease, which dampens this out, but if its dry, it will clunk under torque.

 

I have not, will give that a look tomorrow. Thanks for the input

 

It its empty, you can put about half a tube of grease into it before it starts coming out, which would be a good indication that its your problem.

One of those weird thing that I had never heard of before coming to this forum but sure enough, it was the source of my rear end clunk. It was kinda crazy pumping it in, you could see the shaft expanding like a hydraulic cylinder.

 

Would be a great opportunity to grease all the U-joints also. Especially if they haven't been done recently. I had a similar issue as you but at low speed and it was my slip yoke as Aerindel mentioned. I would also inspect your carrier bearing while you are under there.

Here is an old post I've shared a few times on this subject. I didn't write this but found it on another site.


"The driveshaft slip yoke has a zerk fitting for adding grease. There's a large void under the zerk fitting and it may take 30-40 pumps on a grease gun to actually get any grease on the splines, depending on how much grease was in there to begin with.

Take your grease gun loaded with lithium-based NLGI #2 grease and start pumping grease into the slip yoke zerk fitting. At some point you will encounter increased resistance on the grease gun handle and see that the slip yoke is expanding. Continue to slowly add grease. You will likely see the slip yoke expand on each pump of the handle and then slowly contract. Continue adding grease for about five to ten more pumps or until you see grease coming out around the seal, then stop.

Now get on the rear bumper and bounce it up and down a few times. This will compress the slip yoke and force more grease along the splines. Now take a wrench and remove the zerk fitting to allow excess grease to escape. Once the zerk is removed gently bounce on the bumper again to give it a little help. Clean up the expelled grease, re-install the zerk and you are good to go."

https://www.tundras.com/threads/shutter-or-jolt-as-i-come-to-a-stop.39219/

 

Need to grease crackie's shaft... still haven't done that.

 

That sounds dirty!

 

Crackie or Conky?

 

Good info!

 

Yup. @g2turbo check this thread and click the links: https://www.tundras.com/threads/black-hole-zerk-wtf.93630/

It'll maybe help you avoid my confusion with the process.

 

This is Danny McBride right? @Tundra2 (s) brother.