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Discussion Starter · #1 ·
I have a 2000 Toyota Tundra Limited 2 wheel drive with 294K miles. It has recently begun to shudder when shifting when under a slight load such as going up an incline or hill. This occurs when the trans downshifts out of overdrive or with overdrive off. The trans fluid and filter have not been changed since purchased new. Probably not smart, but is the fact. The fluid level is correct and the unit does not leak. Any ideas as to the problem? Thanks for any and all help.
 

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I don't have time to search right now. I had a shudder that was actually the torque converter and posted my process and good results here. Try searching Torque Converter Shudder. I added 4oz of "Auto-RX Plus" (Amazon) and ran it for 1000 miles. Drained trans. (just from drain plug). topped off and added a tube of Shudder-Fixx (Amazon) and it seemed to remedy the issue. Been over 3000 miles since then. Chap
 

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Try driving with the overdrive turned OFF, and see if it stops.

Lucas makes the best additive to reduce shudder, but it a last resort.
 

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Discussion Starter · #4 ·
Try driving with the overdrive turned OFF, and see if it stops.

Lucas makes the best additive to reduce shudder, but it a last resort.
I have tried with the overdrive turned off and still have the same issue, maybe not quite as bad. Thanks for the suggestion
 

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Discussion Starter · #5 ·
I don't have time to search right now. I had a shudder that was actually the torque converter and posted my process and good results here. Try searching Torque Converter Shudder. I added 4oz of "Auto-RX Plus" (Amazon) and ran it for 1000 miles. Drained trans. (just from drain plug). topped off and added a tube of Shudder-Fixx (Amazon) and it seemed to remedy the issue. Been over 3000 miles since then. Chap
Thanks, I will try this first.
 

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I have a 2000 Toyota Tundra Limited 2 wheel drive with 294K miles. It has recently begun to shudder when shifting when under a slight load such as going up an incline or hill. This occurs when the trans downshifts out of overdrive or with overdrive off. The trans fluid and filter have not been changed since purchased new. Probably not smart, but is the fact. The fluid level is correct and the unit does not leak. Any ideas as to the problem? Thanks for any and all help.
Have you done any electrical changes recently?
 

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Discussion Starter · #8 ·
Also, any check engine codes?
No electrical changes, but did take it to O'Reilly's yesterday and determined it may not be transmission but an engine miss on number 3 cylinder. So I am focusing on that now with new plugs as a starting point. Thanks for the reply.
 

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You may want to have a new OEM coil on hand when you change the plug.
 

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No electrical changes, but did take it to O'Reilly's yesterday and determined it may not be transmission but an engine miss on number 3 cylinder. So I am focusing on that now with new plugs as a starting point. Thanks for the reply.
Cool, at least you are getting a code. I was having some jerking/misfiring like for the last 5 months. I changed all injectors/coil packs, charcoal canister and valves, MAF, sparks, a few vacuum hoses, fuel pump and fuel filter, PCV, timing belt, Cat Converters, transmission fluid exchange (not flush), o2 sensors. Yes a bunch of stuff that was way over due anyways, I got 284K on my 2003 Sequoia. No mechanic could find what the issue was, the last shop where I took it had it for two days and since it wasn't showing any codes, except for "something to do with the ECU" and the tech who drove it said I seemed to be something with the tranny, like a torque converter, which I was also leaning towards, they didn't charge me anything which made me smile :)..I went back the next day and brought them a box of donuts ($3.99) I put in 2 tubes of shudder fix and it seemed to run smoother, but the shudder/hesitation/misfiring sensation was back again. Anyways, the reason I asked about any recent electrical changes was because in my case, I discovered what the issue was....ready? My turn signals!!!! I had discovered that the turn signals were disarming the cruise control and after reading about this happening to others, someone mentioned that that had to do with the wiring to the tow kit harness and I let it go as the cruise control wasn't a big deal to me. However, I didn't think about the turn signal having to do anything with the hesitation issue until last Saturday while on the highway I realized it. Since I'm one of the few in a million turn signal users, I unconsciously use it without even noticing and then I told myself, wait a second, this is crazy! Yes, it was caused by me changing all the tail light bulbs (turn signal, brakes, reverse) to led. For I read somewhere, the led circuitry or filaments had something to do with sending a signal to the brake lights or the actual ECU thinking you were applying the brakes while on the gas pedal. So, I swapped all tail light bulbs back to normal and the hyper-flashing device back to the original and NO MORE HESITATION until I read more of what device(transformer, diode, etc.) I need to use if I decide to go led again. I kept the reverse light as led as it wasn't part of the issue. I apologize for the long story, but I'm sure many out there are probably scratching their heads too and losing sleep trying to figure out what's going on and perhaps they have the same issue as me and hopefully I might be of some help :)..In your case, it looks like something different. Good luck and I hope you get your truck fixed soon. Keep us posted.
 

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Discussion Starter · #13 ·
Cool, at least you are getting a code. I was having some jerking/misfiring like for the last 5 months. I changed all injectors/coil packs, charcoal canister and valves, MAF, sparks, a few vacuum hoses, fuel pump and fuel filter, PCV, timing belt, Cat Converters, transmission fluid exchange (not flush), o2 sensors. Yes a bunch of stuff that was way over due anyways, I got 284K on my 2003 Sequoia. No mechanic could find what the issue was, the last shop where I took it had it for two days and since it wasn't showing any codes, except for "something to do with the ECU" and the tech who drove it said I seemed to be something with the tranny, like a torque converter, which I was also leaning towards, they didn't charge me anything which made me smile :)..I went back the next day and brought them a box of donuts ($3.99) I put in 2 tubes of shudder fix and it seemed to run smoother, but the shudder/hesitation/misfiring sensation was back again. Anyways, the reason I asked about any recent electrical changes was because in my case, I discovered what the issue was....ready? My turn signals!!!! I had discovered that the turn signals were disarming the cruise control and after reading about this happening to others, someone mentioned that that had to do with the wiring to the tow kit harness and I let it go as the cruise control wasn't a big deal to me. However, I didn't think about the turn signal having to do anything with the hesitation issue until last Saturday while on the highway I realized it. Since I'm one of the few in a million turn signal users, I unconsciously use it without even noticing and then I told myself, wait a second, this is crazy! Yes, it was caused by me changing all the tail light bulbs (turn signal, brakes, reverse) to led. For I read somewhere, the led circuitry or filaments had something to do with sending a signal to the brake lights or the actual ECU thinking you were applying the brakes while on the gas pedal. So, I swapped all tail light bulbs back to normal and the hyper-flashing device back to the original and NO MORE HESITATION until I read more of what device(transformer, diode, etc.) I need to use if I decide to go led again. I kept the reverse light as led as it wasn't part of the issue. I apologize for the long story, but I'm sure many out there are probably scratching their heads too and losing sleep trying to figure out what's going on and perhaps they have the same issue as me and hopefully I might be of some help :)..In your case, it looks like something different. Good luck and I hope you get your truck fixed soon. Keep us posted.
Wow. Talk about finding a needle in a haystack! That was quite a diagnostic nightmare glad you finally found it. I will keep everyone interested posted on what I find. Thanks.
 

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I have a 2000 Toyota Tundra Limited 2 wheel drive with 294K miles. It has recently begun to shudder when shifting when under a slight load such as going up an incline or hill. This occurs when the trans downshifts out of overdrive or with overdrive off. The trans fluid and filter have not been changed since purchased new. Probably not smart, but is the fact. The fluid level is correct and the unit does not leak. Any ideas as to the problem? Thanks for any and all help.
It's definitely caused by dirty, contaminated ATF Fluid, I would definitely do a drain and fill, I haven't used any transmission additives, but some people swear about having good results with Lucas after 100 miles or so
 

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You may want to have a new OEM coil on hand when you change the plug.
I was gonna suggest that when I first read the post. I've replaced the same one (cyl#8, rear passenger side). Twice! Then the other side (cyl#7, rear driver side) more recently. Except for two things. The misfire of a dropped cylinder is hard to not notice, even just idling, but definitely under load in any gear, not shifting. Also, I never got check engine light or codes. Still, it could be...
 

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I have a 2000 Toyota Tundra Limited 2 wheel drive with 294K miles. It has recently begun to shudder when shifting when under a slight load such as going up an incline or hill. This occurs when the trans downshifts out of overdrive or with overdrive off. The trans fluid and filter have not been changed since purchased new. Probably not smart, but is the fact. The fluid level is correct and the unit does not leak. Any ideas as to the problem? Thanks for any and all help.
I'm wondering if it could be the TCC (torque converter clutch) sticking. I would think a transmission shop should be able to spot that if so.
 

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I have a 2000 Toyota Tundra Limited 2 wheel drive with 294K miles. It has recently begun to shudder when shifting when under a slight load such as going up an incline or hill. This occurs when the trans downshifts out of overdrive or with overdrive off. The trans fluid and filter have not been changed since purchased new. Probably not smart, but is the fact. The fluid level is correct and the unit does not leak. Any ideas as to the problem? Thanks for any and all help.
Not to be a spoil sport, but at this point, 300K with zero preventative maintenance, it's a moot point. Everything you are going to do is a band aid of sorts. The trans is failing / has failed from both miles and lack of maintenance. If you're going to keep the truck, I'd think best to find a used trans, or a shop that is willing to rebuild. Good luck. It's sad that even many Toyota dealers continue to push the "it's a sealed transmission ... we do not service" line of bull crap. It's a well designed & engineered piece of equipment and must be maintained in order for it to last.
 

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I too am guilty of neglecting the transmission "service" interval recommended by Toyota. By exactly how much is somewhat embarrassing so I'm not openly disclosing that detail. But I have religously monitored transmission temperature, fluid level, color, smell and feel between fingers when checked. The guilt finally got to me and I had it flushed. The mechanics report was that everything looked great inside. Now at 286k miles it stull runs great. Knock wood! I know it can't last forever but it's impressive to me how durable it is.

Not unrelated, my girlfriend's Audi has a sealed transmission which finally failed just shy of 400k miles. The transmission fluid time-temperature charts I found, years ago, said that if not over heated it could last indefinitely. But with heat the fluid breaks down first, then mechanical failure modes follow in a somewhat predictable order without service intervention. My point is care and feeding, early and often, but that doesn't necessarily mean blind trust in experts and throwing money at them. Installing a trans fluid gauge and paying attention to it, especially if doing lots of towing and/hauling, is excellent Murphy insurance.
 

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Discussion Starter · #19 ·
New Update: Finally got around to starting to diagnose my problem that felt like a transmission shudder when under load. I mentioned that I had someone plug a code reader into the truck and it indicated a misfire on the number 3 cylinder. This morning I changed out that plug, and only the plug, not coil. Problem is SOLVED. Praise Jesus. I am going to continue to replace all the plugs, change out trans fluid, and probably purchase a set of replacement coil packs to have on hand. I appreciate all the help and suggestions that have been posted here. You guys are great.
 
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