rumble strip feeling when going 30-40 mph

That's what I've narrowed it down to. I can't find a weight on my drive shaft so I'm thinking it's fallen off. Looking at the Wifes Tundra, she has a big 0.5"x1" weight spot welded to the shaft. Mine has nothing. So I'm hoping that's all that it is.

Doesn't seem like the torque Converter. Doesn't go away in 3rd or 4th or while applying the brakes.

 

I just started having this exact same issue today on my 2007. Just had the transmission flushed about a month ago as well.

Who would need to check out the driveshaft balancing?

 

got mine scheduled with my local Toyota/Lexus shop (not the dealer).
with the description of the rumbling and previous squeaking in reverse, a few months back, he said it sounds like u-joints and said with my mileage that it is about the "around town" lifespan of those u-joints (103K)

 

Mine was a U-Joint that was crapping the bucket on me. When I checked it was tight but I through it in Neutral and chocked the front tires to release tension on the drive train, and sure enough, right near the axle it was eating itself away. $40 and an hour later, good as new.

 

I've been wanting to post my "update".....
I brought my truck to a transmission shop to have them look at it because I was told if the driveshaft was off balance, it will vibrate all the time and not only on certain speeds. So, after getting some estimates as to "what-if-its-this-or-that", we decided to start at the lowest estimate first since it would had to be done anyways. The shop did a transmission fluid and filter change (not a flush) and they added an additive to it (I can look at my paperwork if you want to know). The mechanic went for a test drive and came back telling me he didn't feel anything, but he also didn't know what the vibration was since he didn't drive it before he did the fluid/filter change. So he asked me to drive it and he'll ride with me to see if it was still there. To my surprise, the vibration was there but only minimal (at 1 on a 10 scale). The mechanic told me to drive it for a couple days and see if it goes away once the additive gets mixed in with the fluid and bring it back or just to call back. The vibration went away the next day. I waited two days to call him back just in case it came back. I put about 70 miles on the next two days. I paid $140 including fluid, filter, pan gasket, the additive and labor. I don't know how much a transmission fluid/filter change cost, but I think it was well worth it.

Let me know if you guys have any questions.

 

Any further update a few years later? I’m having the same issue with my 07 Tacoma at 160K. Mechanic wants to put a new tranny in but sounds like this is the way to go!

Do you happen to recall what the addditive they put in there was?

 

Lubegard Red, Platinum or Instant Shutter Fix.

 

^^^ That'll do it. Very well known problem and many threads on this issue in the 4Runner forums. Fluid change and Shudder Fix and it's been gone for 2 years. It's a converter lockup problem. Do a test - put it 4th rather than "D" and go for a drive. Tell us if it goes away.

 

I know this is old but having the same issue (3-4th and 4-5th gear) on a 127k mile 06 taco, assuming it was never changed.. hopefully it's just the fluid. Had Toyota do the 4 quart drain/fill, 40ish miles after a fluid change, (no filter change though), it seems slightly better, I am hoping it's just going to take more time/miles to go away completely. They did put in a different transmission conditioner called "NG ATC Plus" when doing the fluid change. Looking for updates from anyone on this thread to see your longer term results, thanks!

 

sounds like what my 2003 tacoma was doing before i traded it in.
it ended up getting worse.
my work fleet mechanic said it was my drive train and it would have to be replaced.

 

Replace torque converter. Instant shudder fix will work as a band aid but converter replacement is the proper fix for this issue.

 

I should have came back to this a long time ago, but a fluid swap + lubeguard and shudder fix solved the issue, about 20k miles later it hasn't done it since.