40mph, 1100rpm shudder/ buck

I've got a two inch tapered Block in the rear. I have no axle wrap or shudder or anything like that on initial acceleration. Frequently though, when I am accelerating on fairly Flat Road, then I hit a slight incline, it seems to not want to downshift and I get down to about 40 miles an hour and 1100 RPMs. Unless I mash the gas usually hard to make it down shift it starts to shutter or buck. It's like the gear can't handle the incline but it doesn't want to downshift. i believe it's in 5th at that time. It's also actually the very same feeling under a very similar load that my wife's old 2009 Buick Enclave did. That was due to bad coils. I do believe I remember this happening before I put the blocks in but has anyone else noticed this and/ or do you think it's the transmission or just the blocks?

I had a technician at my dealership ride in it and he said it was a stupid transmission. Yes that's really what he said. I'm trying to decide whether or not I want the service director to look at it for me.

Thanks

 

It's still got the original tires.

 

I believe it has to do with the transmission as well or the torque converter in the trans, but we will see. And if I find out me info I will post on here.

 

I had the service director drive it this morning. He made the shudder happen for himself, but not the buck. I am not sure how the buck happened as it's only happened one time.

He said there has been a lot of unhappiness with the gen 3 engine and transmission computers and this is one of the issues. He mentioned that the torque converters on gen 3s "lock up" in either 2nd or 3rd gear, where as older ones didn't lock up until top gear, for fuel economy. I'm not too familiar with torque converters and didn't understand what that meant. He said, "I'd never suggest that you need to change your driving style, but IF you were to, do you think this wouldn't be an issue." I said yes for the most part. The normal shudder I feel I know when it's coming and as long as I mash the gas much harder than I am inclined to, it will downshift. So he basically said I would never suggest you need to, but I am suggesting you need to. As I expected, there's nothing working incorrectly here. He's seen this many times and there are a lot of people not happy with the driveability of the gen 3.

I got a similar explanation from GM of "it's working as designed" on a truck I recently completed a Lemon buy back on. Saying that makes me feel like I am being overly picky.... again......

 

same thing is happening to me on my 2106 2wd at 72k, never once have I felt it before. It does only happen when im limited by people doing the speed limit in my tiny town and Im more calmly driving. It is still scaring the shit out of me though as the shuddering cant be good at all for the drive line components. Has anyone figured anything out?

 

Tsb 58 or tsb 62. Works for me

 

I have the update. It didn't do anything for me. I still have the EXACT issue in 58 as well. Surges 40-50mph. The Toyota tech (not a dealership tech) said that there is nothing wrong with my truck. It still shakes/bucks in just about every gear now. He mentioned the driveline angle but said that was NOT causing this (as I would expect because it was doing it prior to the rear lift).

 

It wouldn't hurt to fix your angles. I'm not sure if the TSB fixed my truck or I just learned how the gas pedal works but my truck doesn't buck or anything of the sort.

 

It's got a 2" block. I have the angle somewhere and it's like 1* off. Either way, the Toyota tech said that wasn't causing the problem in addition to the fact that I was having the problem before the block.

 

Not that it compares 100%, but my 2015 exhibits this exact thing. Has done it for some time, but not the entire 50k miles. Another guy online said he got his trans flushed and refilled and it solved it. I am at 50k and am going to try it.

It seems to be related to the torque converter and the very low RPM’s while under slight load like up a gentle incline that needs little effort.

If you think about it, its like when a manual stays in gear all the way down to a low RPM. I think the converter is locked up at this time and behaves much like a manual. The isolated bang you heard could have been the converter locking unlocking in a strange situation.

Would be helpful to know mileage on the vehicles affected and if they tow heavier loads. I have 50k and tow 4,700lbs occasionally.

 

Transmission update helped me, but it will still bog down sometimes if I am going up a hill and it doesn't downshift. Just give it a little more gas and mine downshifts like it should. The transmission update made a world of difference

 

Mine started within 2,000 miles. It may have been at first but my wife drove it the first 2,000 miles. I've towed 5,000lbs once. Otherwise I a tow a small boat that might be about 500lbs with the trailer.

They say it is due to TC lock up. The service manager at my dealership, a big dealership at that, says that "it is designed to shake the whole truck rather than downshift." I really hope he doesn't believe that. I can get it to downshift if I make it a point to push the pedal half way to the floor but I just don't drive like that. I hit that bad spot every single time I drive it.

I hit the surges much less often but the surge is much more clearly the exact issue in TSB 58. I have the update and I am still surging. They can't tell me that it's supposed to surge because they already have a "repair" for it. You don't repair something that is working exactly how it's supposed to.

A transmission flush might fix it. I have no idea. Toyota decided that nothing needed to be done to it. I'm waiting on them to respond to another letter about it.

 

I have about 3k miles on my tsb58 and the little bit of shaking I experienced is gone. Haven't heard many saying it returns,but some that have it come back disconnect the battery for 30 min .

 

Get ovtune and flash your ecu. Easy fix

 

I paid Toyota for a truck that worked right to begin with and I buy new so I don't have to do this kind of stuff myself. I'll keep pressing them to make it right.

 

This is still happening.

Can anyone tell me if they have surges in power 40-50mph while under hard acceleration? I have the computer updates but this is still happening for me. It would normally up shift at 40mph or at 45mph but if I'm on the gas hard enough to keep the gear, I get surges of power at 40, 45 and again at 50mph. Anyone??

 

The TSB for the 40-50 mph surge was a surge where the truck would stop accelerating when shifting with an almost felt like its in neutral for a second or two (Due to some TC lock behavior). However the engine has a surge of power at about the same speed during hard acceleration due to the ACIS intake mechanics, this however is not addressed by the TSB. They are similar behavior but different things. Can't really explain it by typing. The TSB fixed the jerky shift that occurred at that speed but not the ACIS surge in engine power. The issue is the TSB wording for all these problems is bad and I wish they would release a new TSB that just says something general rather than specific tiny patches.

 

I see. I definitely still have a surge. Now it's also shaking at idle. My engine has a lot of rattling at idle as well.

 

I have a 2022 Toyota Tacoma XP V6 4x4, and mine has been in the shop for a week. First time they reset the TCM and now back again. 2nd round, resetting the TCM, and have to go back after 500 miles. Hope this helps, but was told that the help desk will compare the data and proceed from there. Don't know if this helps but your not alone in this.

 

Any updates on this issue? I am experiencing the same thing. I’m going to try lube guard and see if it helps. Verified fluid level. 2023 OR.