clunk at stop light

I thought the same thing happened to me a few days ago. Heard the thump. Then realized is was a car behind me that bumped my receiver hitch.

 

Guy's I had the exact same problem on my 06. I had the tranny serviced and that was the end of the problem. You might want to look into it. A tranny flush is only 250.

 

My 4Runner 06 limited does that....
jet

 

The first time my tranmission went clunk at a stop light I thought someone had rolled into me.

 

i just bought my truck 3 weeks ago and i brought it back to the dealer 3 times for him to figure out what this "clunk" is .. they said they went through the trans and found nothing wrong.. makes me happy that i found this thread cuz i was ready to go down to the dealer and beat the piss out of this guy ..

 

I am another victim of this problem. I have also felt like ive been "rear ended" at a stop light. Kinda weird but I feel that it has something to do with the trans as well. Almost like the trans downshifts itself to first really hard after a short delay. I just pray its nothing that will cause serious damage... Im not under warranty anymore!

 

once again another perfect match for what my truck is doing...i might bring the truck up to the goodyear and see what they say...

 

Mine makes this sound as well. I know my sound is axle wrap though because if I come to a stop and than hold the brake down firmly, no sound. But if I'm barely holding the brake pedal down because I'm lazy, I hear a mild little clunk. I think its just the rear brakes releasing sooner than the front and pre-loading the rear suspension.

 

Okay, for those of you that feel this thump while at a light... Do you have any sort of lift on your truck?

I to "had" this problem when I had a spacer in the front and the TSB done in the rear. Today, I am running Bilsteins in all four corners and also have an Add-a-leaf in the rear. I don't feel the "Thump" anymore, BUT I do feel the truck shake in increasing speeds. There is a fix for the too, but haven't done it yet.
Either way, I'm under the impression that the truck has to be perfectly right between the front and the rear in order to not feel any of these nuances.
Add-a-Leaf used on my truck.

 

Mind does this same exact thing. Annoys the heck out of me.

 

Guys,
I had this issue on my 07 Taco, 08 Tundra, and also on my 2010 Taco that I just bought. I fixed both the 07 and the 08 but haven't got off my ass to fix my new one. What causes this is the slip yoke on the drive shaft is binding. When you start to move, the yoke will finally decide to move inward as the back of the truck squats a little on take off. You feel it usually more than you will hear it. The fix is to drop the driveshaft and seperate the slip yoke. For most it is best to take it to a machine shop and let them drill and tap for a grease zerk on the female part of the yoke. This problem will also cause slight vibrations and shudders in the drivetrain as the slip yoke is putting the drivetrain in a bind. Ask anyone that has had a Gen 1 and forgot to grease the slip yokes regularly, they will have these issues until they grease the yokes and drive it for a while.
Good luck, Fred.

 

Isn't the yolke internal on the second gens, and automatically lubed up by the tranny fluid?

 

I feel the "bump" about 3 to 5 seconds after coming to a stop in my 2009 A/T. I too feel that it is related to the transmission. I am a technician on city buses which have adaptive automatic transmissions just like our Tacomas. They have an identical "bump" feeling just after coming to a stop. One of the senior heavy duty mechanics told me that after coming to a stop the pressure slowly drains from various galleries in the transmission. Once the pressure drains you feel a "bump" as the clutch plates re-seat and the vehicle is ready to accelerate from a full stop again.

I wonder if this is related to the tranny reflash TSB problem- If you go around a corner after braking and your clutch plates take 3 seconds to engage you would feel like you were in neutral. I am going for the tranny TSB this month and will let you know if it helps with the "bump".

 

My 2010 does this occasionally. If I go to a dealer what would I tell them so I could get it fixed right the first time? I mean, are there any key words that the service manager might be looking for in order to perform a TSB?

 

My 08 Off-Road did this and my 2010 Sport does as well... Only happens to me when the A/C is on though so I think in my case its definetly the compressor.

First time it happened to me in the 08 I thought someone hit me... naturally giving the car behind me the hairy eyeball. lol

 

Now that i think about it mine does it when the a/c is on too. Wonder if there is a fix for that.

 

Gentlemen,..Gentlemen. That is NOT axle wrap. Part of it is slop in your U-Joints (I have had mine replaced twice). Also, I have found it always happens when my AC is on. To me it seems like your Transmission is shifting down while you are stopped and have your foot on the brake and then the truck almost lurches on you.

I would think the Toyota people need to check this out because I know several people with Tacos that do this. The dealer near my house plays dumb on this. But the problem got better each time my U-Joints were replaced but did not go away.

 

Mine has done this occasionally since it was new. I now have 1,100 miles on it. It doesn't do it frequently, and haven't noticed it recently (but haven't had the A/C on).

 

If you're interested in a solution...check this out.

http://www.tacomaworld.com/forum/1st-gen-tacomas/108316-goodbye-axle-wrap-mod.html

It's in 1st gen forum, but they have the same problem as do lots of people with other Toy's as well as Fords, Nissan's and anyone with progressive rate leaf spring suspensions and auto trannies. A split-shaft drive-line makes it even more likely you'll experience it.

I used the helper spring solution (others say just the clamp does it) and those annoying 'thump' at stop lights from the sticking splines is gone now but I also noted just how much the helper spring added so much to throttle response. When I punch it the truck just goes now, with no hesitation as the axle winds up. Ever so much nicer than the mushy feel it had before, especially in a turn where predictable performance is most appreciated.

Axle wrap causes a lot if issues: the thumps we feel as the sticky spline lets go, the mushy throttle response I notice. The speed crowd have big time issues when it causes wheel hop on power take-offs when drag racing. These are not new problems and the solutions are as low-tech as it gets but time tested!

 

I have had the same issue, AC on or not and I drive a MT, so it has nothing to do with lurching forward. I feel it has to do with the drive shaft as noted above. Almost as if the truck settles and the RMPs come down and torque is lowered. Its something I am living with for now but wonder if the slop in the slip yolk will cause damage down the road if not addressed. I do keep up with my greasing.