Vibration at 30-40 mph

I have a 2007 TRD sport with just south of 200,000 miles. Within the last couple thousand miles I’ve started to get a vibration in the truck when hitting 30-40 MPH. I’ve been basically ignoring the issue and hoping it goes away but it doesn’t seem like that’s the case here. It hasn’t effected gas mileage and I haven’t noticed any unusual leaks. (Right before the issue started I had a major repair to fix multiple oil leaks) I changed the spark plugs recently and I’m fairly confident it’s not an alignment or tire issue. Feels like some kind of a transition issue but I’m getting no lights on the dash or any transmission fluid leaks. Could this be a ECU issue? Any help would be greatly appreciated.

 

Is your truck a manual or Automatic?
If Automatic, does it do it if you leave it in 4th gear?

You might also try driving in 4WD, see if it goes away in 4WD.

Let us know if it goes away when testing the 2 suggestions above.

 

Automatic, I’ll give those a shot thank you.

 

Looks like when driving in 4th the problem doesn’t occur. What could this mean?

 

Torque converter shudder probably. Next time it starts to shudder, lightly tap the brake with foot still on gas and see if it stops. TC unlocks when brake switch is on.

 

Is this something that you’d recommend getting checked out sooner then later? I’ve been driving on it for some time and it hasn’t really effected anything. I’ve noticed when I’m driving and it starts to shudder if I take off the gas and then accelerate through I get no shudder.

 

It means the transmission fluid needs to be serviced. Wont leave you on the side of the road by any means but its something that should be done if your having symptoms like that.

 

And yes, a TC shudder is only felt light throttle partial load.

 

Sounds good thank you for the insight I really appreciate it.

 

About the only thing you can do “cheap” is drain and fill and add LubeGuard.
Even better would be to drop the pan and clean the magnets and change the filter.

Shudder is a known issue on some trucks.
There’s multiple threads on the issue.

If you really want to know all about the A750 Automatic Transmission, I’d start here.
https://www.tacomaworld.com/threads...th-pics-for-second-gen-4-liter-trucks.289913/

This is LubeGuard. -

$17 Lubegard 63010 Platinum Automatic Transmission Fluid Protectant, 10 oz.

https://www.amazon.ca/Lubegard-6301...qid=1547097336&sr=8-2&keywords=lubegard+60902

There are multiple people that have drained and refilled the transmission and added LubeGurad and it solved the shudder. But there are also people that have done the same, and the shudder was still there.
I guess my pint is, LubeGuard is cheap compared to pulling the transmission and replacing the TC.
It’s worth a shot.