Rumble strip effect feels like driving off the edge of the highway onto the wake up strips ground into the pavement. My first event lasted for about 5-7 secs. Scared the hell out of me. Thought I ran over something in the road.
Dependent on road incline, rate of acceleration, and speed determines how long it lasts. I have gotten pretty good and duplicating conditions pretty much at will. Now I am getting a new ka-chunk and thud when the tranny upshifts from 5th to 6th gear.
Hoping the dealer gives me some quick relief tomorrow morning. Just turned 700 miles. It is very irratating.
Rumble strip effect feels like driving off the edge of the highway onto the wake up strips ground into the pavement. My first event lasted for about 5-7 secs. Scared the hell out of me. Thought I ran over something in the road.
Dependent on road incline, rate of acceleration, and speed determines how long it lasts. I have gotten pretty good and duplicating conditions pretty much at will. Now I am getting a new ka-chunk and thud when the tranny upshifts from 5th to 6th gear.
Hoping the dealer gives me some quick relief tomorrow morning. Just turned 700 miles. It is very irratating.
Ditto that feeling.
__________________
Death is the number one killer in the U.S. today
Mine was worst around 700 miles too, but now that I'm around 1100 I haven't felt it in a week. Hopefully some of you will have the same results. Although, I'm still unsure if the problem is gone or not. Time shall tell.
Ok Gentlemen and woman, I took mine in today and did a test ride with the Service Manager. He had me drive to demonstrate. I have to say it is getting harder to duplicate as the miles pass by but I was able to get the rumble to occur while driving. The service manager immediately noticed and said " that is not good, we need to fix that right away" Through another 30 min. conversation he suggested the Torque converter was likely the problem and explained that Toyota was not going to let this slip by with a rebuilt anything. However, he wanted me to take the truck home and continue driving while he researched Toyota contacts to see what to do about my trouble.
A short hour later Service Manager (SM) calls and says Regional Tech rep instructed him to drive the truck himself and see if he could duplicate rumble. If he is successful, then they need to disconnect or short across(not sure which) the brake light switch and redo the test drive again. Dependent on results of these tests, will determine next step of the process.
My first thought was, I am sure glad the dealer is cooperating and not giving me a run around. Second thought is what does the brake light switch have to do with the transmission? Anyway, it was a good experience today and I look forward to next Tuesday. They are even giving me a loaner car for the day too. I wasn't dealing with shuttle service for the whole day.
Now we wait.
In the mean time, I drove home 23 miles this afternoon and could not get the rumble to occur until just before pulling in my drive. Shame is it occured at a completely different speed and rpm. I am believing more and more it is the Torque Converter too. Feels like the clutch discs slipping even if just for a moment under load.
Finally, I must say I still love my truck and am going ahead with orders for Chromed Billet Grill(stainless) $179 and Chromed front door handle covers $38 off ebay.
The brake light switch is tied into the torque converter clutch inside the torque converter. The clutch activates after you get into the higher gears and allows the engine to be coupled to the transmission like a normal clutch would in a truck with a standard transmission. This takes the stator and the converter action out of the picture to reduce power loss through the fluid in the converter. The clutch is used to give better fuel mileage.
Remember what would happen if you tried to stop a truck with a manual transmission and not push in the clutch? The engine would eventually stall.
This would also happen on a vehicle with a torque converter/converter clutch.
The brake light switch sends a signal to the power train ECU letting it know that your are trying to stop and in turn will disengage the torque converter clutch.
By jumping it he is taking it out of the troubleshooting equation.
Hope that helps.
Last edited by MarylandTundra; 09-29-2007 at 06:32 AM.
The brake light switch is tied into the torque converter clutch inside the torque converter. The clutch activates after you get into the higher gears and allows the engine to be coupled to the transmission like a normal clutch would in a truck with a standard transmission. This takes the stator and the converter action out of the picture to reduce power loss through the fluid in the converter. The clutch is used to give better fuel mileage.
Remember what would happen if you tried to stop a truck with a manual transmission and not push in the clutch? The engine would eventually stall.
This would also happen on a vehicle with a torque converter/converter clutch.
The brake light switch sends a signal to the power train ECU letting it know that your are trying to stop and in turn will disengage the torque converter clutch.
By jumping it he is taking it out of the troubleshooting equation.
Hope that helps.
Yes, that definitely clears it up. I just learned a few new things about the drive train I didn't know. Thanks!
__________________
------------------------------------------------------------------------
2007 Salsa Red Tundra DC 5.7L SR5 w/TRD package
2005 Suzuki GSX-R1000
2006 Kawasaki KX450F
Wow.... Thanks for the explaination. Makes good sense. It would seem odd to me then that the switch would be causing the problem I am having.
The trouble does only occur under heavy load 1250 rpm and 32-38 mph. I have marked shift points and am sure the transmission rumble is occuring between 5th and 6th gear. So now I understand the tie in with the brake switch.
I posted an update on another thread but didn't see some of you there so here is another copy.
Took my truck back for second round of troubleshooting this morning. The service manager called me just an hour later to say the tranny had to be replaced. Toyota is all over this rumble problem. Apparently has to do with a lock up problem associated with the torque converter. Both are being replaced bran new, not remanf. Area rep says they don't have any remanf. units to send. Yeh... for me. My service manager has been great and forthcoming with all kinds of info. Really getting treated right except they put me in a Corrola rental. I can live with that knowing I didn't get the run around on the tranny trouble.
Also, found out that the clunk some folks are feeling on start and stop has to do with the slip yoke on the drive shaft. Toyota is aware of this too and have issued fix to dealers nationwide. No need to swap out differentials or drive shafts. The problem has to do with either too much or too little grease in the slip yoke. I had the problem when I drove off the lot but it resolved on its own over the first couple hundred miles.
That said, I have renewed confidence in Dealer Service and Toyota's quality product support. Gotta love Toyota!!!!
I posted an update on another thread but didn't see some of you there so here is another copy.
Took my truck back for second round of troubleshooting this morning. The service manager called me just an hour later to say the tranny had to be replaced. Toyota is all over this rumble problem. Apparently has to do with a lock up problem associated with the torque converter. Both are being replaced bran new, not remanf. Area rep says they don't have any remanf. units to send. Yeh... for me. My service manager has been great and forthcoming with all kinds of info. Really getting treated right except they put me in a Corrola rental. I can live with that knowing I didn't get the run around on the tranny trouble.
Also, found out that the clunk some folks are feeling on start and stop has to do with the slip yoke on the drive shaft. Toyota is aware of this too and have issued fix to dealers nationwide. No need to swap out differentials or drive shafts. The problem has to do with either too much or too little grease in the slip yoke. I had the problem when I drove off the lot but it resolved on its own over the first couple hundred miles.
That said, I have renewed confidence in Dealer Service and Toyota's quality product support. Gotta love Toyota!!!!
if what you say is true (and I have no reason to think otherwise) then many posters and tundra owners will be thrilled to hear that one widespread problem with the tundra is being resolved.....
Well we are two for two.... Just got pm'd by another Tunra owner.... His dealer has him in the same spot as me. New tranny on order for rumble problem(torque converter) and clunk(slip yoke on driveshaft).
Gotta give the credit to Toyota for figuring out the problems and fixing it right without question.
Well we are two for two.... Just got pm'd by another Tunra owner.... His dealer has him in the same spot as me. New tranny on order for rumble problem(torque converter) and clunk(slip yoke on driveshaft).
Gotta give the credit to Toyota for figuring out the problems and fixing it right without question.
The bigger question is are the new tundras rolling off the line fixed or are they susceptible to these two problems?
I have 1000 miles on my 2007 Tundra (5.7L TRD) and this is my second transmission that vibrates when it down shifts. A week ago the dealer replaced the torque converter and tranny. After a week of driving it started to vibrate again. It doesn't do it often but the bottom line is that it does it! The dealer is getting it back on Monday morning. Any suggestions? This is my third Tundra and the first with issues.
Any suggestions? This is my third Tundra and the first with issues.
I have the same issue...I was offered a new tranny/torque converter. The regional technical rep told me it might fix the problem, might not....that the drive train engineering team is working on the problem, but does not yet have a fix. Some trannys have it, some don't.
I am waiting for a permanent fix. I really don't it replaced on a "maybe it will fix it". I can live with for a while and give Toyota time to come up with a real fix.
__________________
2007 5.7L Tundra CrewMax Ltd 4x4 in Radiant Red
Sorry to hear of yet another tranny issue. Vibration when down shifting is something new on this thread?
Mine was a rumble when accelerating 32-38mph/1200-1300 rpm usually under load such as slight incline. Easily duplicated under the same conditions. I don't have my truck back from dealer with new tranny yet. Hoping to get it back tomorrow. Service manager called Friday to say the tranny has been replaced but he didn't have time to do quality control test drive. I expect to hear from him early Monday morning.
I am convinced the rumble problems stem from a bad batch of torque converters and I feel comfortable with dealer explaination on drive line clunk. Especially since we now have two dealers with the same area representation making same assessment. We will see. I will post when I get mine back working as it should.
Re: 2007 6 speed transmission failures
Linear Mode
