Thud when coming to a stop

I always thought it was the front brakes or something. It came with an abrupt stop. It sounded like the front pads moving around in the caliper when the weight of the vehicle shifted from forward to rearward after reaching a complete stop.

I just don't brake hard so I don't hear it anymore.

 

It's the gasoline in the tank sloshing forward, even though there are baffles in there. It happens to me only on full tanks down to about half a tank. That tank weighs hundreds of pounds full and the movement of the gas in there when you come to a stop pushes it forward, back, then forward again and that's when the thud happens.

It also happens in reverse when I stop after pulling out the driveway, so I know it's not a downshifting thing from 3rd to 1st or something like that. Easy way to prove it is have someone drive your truck and stop, if you're close to the tank, you can hear it slosh then thud.

 

My truck just started doing this, I'm wondering if it has something to do with hill assist? It sounds mechanical but it seems out of place. This happens in the rear end a second or two after stopping even at a slow enough speed where fuel would barley move.....in neutral down a hill, clutch out

 

Don't think so. It has to be either "axle wrap" OR an under greased driveshaft spline.....
Have you lifted the truck..? Have you torqued the rear U bolts..?

 

No lift, no on the u bolts either. Going to try and find some sort of consistency in it so I will be able to replicate it for the tech.

 

I'm gonna go with this one. I have 2017 DCSB off road and feels like the tranny is held to a higher gear anticipating for you accelerate again before abruptly downshiftng to first because you want to stop.

My coworkers 2nd gen does it too from time to time. I don't mind it but oh well.

 

Does this seem tranny related or drive train..?

 

Is this the common issue of gas in the tank making the thud?I get that.. or are you speaking shifting related?
I get a major thud when shifting into 1st, I always use my sport shift to do my shifting instead of automatic but it still does it in auto (less). I complained to Toyota and they agree it feels odd so i no longer shift into 1st, i let the auto do it and it's not as bad.

Ok, the weird thing..... now that it's winter and i've been in 4X4 full time, it NEVER does it when I down shift... WTF? so, it has something to do with the front differential being engaged?

 

Have you had the tranny fluid physically checked..? Most come from factory low on fluid. That causes many issues..!

 

Mines a manual transmission

 

Honestly seems computer related.... I've gotten it happen multiple times in a row at an almost stop transmission in neutral rolling down a hill, apply brakes truck stops completely two seconds later it's almost as if the brakes apply themselves again as a fail safe or something not even moving fast enough to feel a weight transfer.why I'm wondering if it has something to do with hill assist or vsc?

 

axle wrap, typical on all GENs Tacoma truck the fix is grease the driveshaft with a #2 grease

 

Sounds like a drive train issue to me..! Either the drive shaft (propeller shaft if yer Japanese)...or rear springs, hanger bearing, etc...!

Sorry can't help beyond that... My truck works very well and no such issue...!!

Good luck..

 

Numerous times. They "swear" they checked it... lol

 

**********
????
Grease where?

 

You are actually getting close to a cause, but not fuel sloshing around but the tranny/idle speed issues. Here is why!
Any one that has this hard down shifting problem, TRY THIS: The next time you can safely do it.
As you are coming to a stop - Totally LOOSEN your grip on the steering wheel, as to have no input to the power steering pump!
Here is the reason I am saying this. I have a hard down shift as well -- I also have a severe surging issue (So severe -it scares others when they drive the truck). Toyota is working with me on this problem. The Toyota area Service Rep.actually noticed on a test drive (in the dealer parking lot) that the truck ONLY surged when I was providing input (via the steering wheel movement) to the power steering. It surged then and ONLY THEN! My RPM goes up between 100-200 RPM. I got in 2 other brand new Tacomas and did the same moving the wheel on those -- They only go up about 50 RPM or so. The area rep (named Kent from KC area) actually discovered what is causing my surging -- how to fix --that's next.
Last week or so every time I have been able to safely let loose of the steering wheel, I checked to see if the two issues are related -- believe it or not --when letting loose of the wheel (no input to the power steering pump) absolutely NO hard downshifts.
In conclusion --I feel when your truck is reving (maybe too much as in mine) and you are slowing down with braking, the tranny is getting contradicting signals --thus the slam downs.
Try out my theory -- let me (us) know

 

The surging is definitely bad. I almost bumped a car in the drive through today. Makes sense how the two can be related.
My last Tacoma was an 09 and sometimes this new one gives me the feeling that the drivers not in control. Way too much cpu influence on the driveability imo.

 

Sounds interesting..
Curious to try it out, I don't have surging issues but definitely hard last shift.

 

I am serious about this -- think about it: especially if you have one of the "surgers" like mine --that rpm is going up 150-200 rpm just as your slowing down to come to a stop- The tranny/computer is confused as all get out--sort of like getting mixed/multiple/conflicting signals all at once. I am retired --usually have lots of time -- I think I have tested the "stopping fast" many times (maybe 15-20) --never got any hard/slamming downshifts when doing no steering (again be careful when doing this).
The other thing to try -- when backing up (as I have to do daily in a 80ft one way drive) or even going forward slowly -- I will bet your truck will not surge in RPM's if you (sort of) let go of the steering wheel. This would ONLY be a problem if you have one of the "surgers".
The Toyota Rep has already acknowledged -- I have a definite problem with mine -- I am giving them time to figure what to do about it!
My non-expert opinion is that the problem resides in the power steering pump or the Main Electronic control unit for the engine -- something is telling the engine to rev too much.

 

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