100 Series General Tech and Classifieds (3 Viewers)

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Yesterday afternoon I started to periodically get a vibration at just under 40 mph that felt almost like a rumble strip on the side of the road. I couldn't tell of it was between gears and would stop after just a second. It is overdue for the 90k service so I think I am going to call Graves and Stoddard to get that done and have them check it out at the same time. I hope it's not the transmission but I'm not sure what else would do that.
 
Graves and Stoddard checked out the u joints and regreased them when they did the 90k service today and said they looked fine. They couldn't reproduce the problem, but of course it did it once on the way home. I seems like it is when it is shifting from 4th to 5th at lower rpms. It reminds me of something between running over the rumble strip on the side of the road or trying to shift to early in a manual transmission. It sounds similar to torque converter problems I read on 60 series pages.

I tried to check the transmission fluid level, but the realized the 06 has the closed system with no dipstick because it uses the WS fluid. I am planning on just watching it and calling a transmission shop if it continues. I may also try putting it in the ECT Power mode to keep the RPMs higher.
 
Happened to me once on a long trip, was going about 160, heard the noise, felt the rumble, slowed to about 80, opened windows, checked wheels, nothing, then my back left wheel came off, the axle started dragging on the road, the wheel headed straight for a crowd on the roadside, they parted like the Red Sea, luckily no one was hit, the wheel hit a rock at about a 45 degree angle and flew straight up, and landed so we could find it, when I looked at the axle there were no wheel nuts left. I then checked all the wheels as I had asked the service centre to do a tyre rotation, and brakes check, all nuts were looses and I tightened all the remaining 3 wheels' nuts. Luckily someone we had met 5 years before recognized my wife and stopped to pick up my family & they went back to their house whilst I remained and patched up the drum, borrowed nuts from other rims, replaced the spring in the drum brakes that had disappeared when the drum decided to follow suit after the wheel, and managed to get the vehicle to the great people that were looking after my family... So much could have gone differently & so much could have been much worse... we thanked God that night.
 
AndyO78FJ40 said:
Graves and Stoddard checked out the u joints and regreased them when they did the 90k service today and said they looked fine. They couldn't reproduce the problem, but of course it did it once on the way home. I seems like it is when it is shifting from 4th to 5th at lower rpms. It reminds me of something between running over the rumble strip on the side of the road or trying to shift to early in a manual transmission. It sounds similar to torque converter problems I read on 60 series pages.

I tried to check the transmission fluid level, but the realized the 06 has the closed system with no dipstick because it uses the WS fluid. I am planning on just watching it and calling a transmission shop if it continues. I may also try putting it in the ECT Power mode to keep the RPMs higher.
Click to expand...

Have you searched on the main 100 forum yet? I get sort of a thunk/vibration around 60 if I let off the gas and then press the gas again. It's like there is slack in the drivetrain. I will do some searching and see if i can find the thread. THe description sounds more similar to what you are experiencing.

Doesn't seem like it would be transmission related though?? What did G&S have to say as a possibility?
 
I am going to try to tie it to a rpm or mph if it keeps happening. It seemed like it was between 35-40 mph. I tried searching the forums last night and couldn't find anything to fit the noise on the 100 forum but a discussion of torque converters on the 60 forum sounded a lot like the problem. G&S couldn't reproduce the problem so they didn't give that many ideas but suggested a transmission shop next.
 
AndyO78FJ40 said:
I am going to try to tie it to a rpm or mph if it keeps happening. It seemed like it was between 35-40 mph. I tried searching the forums last night and couldn't find anything to fit the noise on the 100 forum but a discussion of torque converters on the 60 forum sounded a lot like the problem. G&S couldn't reproduce the problem so they didn't give that many ideas but suggested a transmission shop next.
Click to expand...

Highly unlikely it is the tranny.

Are all the ujoints grease able? If not, one may be bad.

G&S good but likely won't go extra mile to find your noise.
 
I had a worn out u-joint - the major symptom was that it squeaked loudly only in reverse. Sounded like a hamster running on a little hamster wheel..?

But, mine does have a rhythmic vibration (slight) at highway speeds. Nothing nearly as loud or noticeable as a rumble strip would be.

The shop said your drivetrain looked ok though?
 
Would u joints be intermittent? I has no problem on the way to work this morning when it was cold. It seems like it only does it after it has been driving and warmed up. They said the u joints looked good and they regreased them, but I don't know how hard they looked. I can try to climb under the truck after work and look.
 
Run it by here. Not sure if it is something we can work on but at least we might could help narrow it down for you. Give me a call. I am here the rest of the week.
 
This may be totally steering you wrong...

If it has a metallic sound to it, check to make sure your exhaust isn't rattling into a heat shield. My brothers Z71 did this only as certain highway speeds - 70ish MPH. I think it caught the air just right and caused the noise.
 
Thanks Chris. I'm off Monday so I may try to bring it by then.

Lakeland drive in rush hour was not the ideal place to test drive, but it seems like it happens at around 40 mph at 1600-1800 RPM either in 4th or going from 4th to 5th. It only did it twice in the 30 min drive so it was difficult to really analyze. It doesn't do it at 40 mph at different rpms or at those rpms at different speed or gears so I'm still leaning towards something in the transmission. If I am accelerating and keep the rpms closer to 2000 than it doesn't do it at all.

It almost seems like the shift points are off and it wants the rpms higher or it is not jumping between 4 and 5th right because something is worn. I really wish there was a dip stick to test the fluid level and condition. Evidentally the WS transmission fluid is very sensitive to humidity to that is why it is a closes system.
 
AndyO78FJ40 said:
Thanks Chris. I'm off Monday so I may try to bring it by then.

Lakeland drive in rush hour was not the ideal place to test drive, but it seems like it happens at around 40 mph at 1600-1800 RPM either in 4th or going from 4th to 5th. It only did it twice in the 30 min drive so it was difficult to really analyze. It doesn't do it at 40 mph at different rpms or at those rpms at different speed or gears so I'm still leaning towards something in the transmission. If I am accelerating and keep the rpms closer to 2000 than it doesn't do it at all.

It almost seems like the shift points are off and it wants the rpms higher or it is not jumping between 4 and 5th right because something is worn. I really wish there was a dip stick to test the fluid level and condition. Evidentally the WS transmission fluid is very sensitive to humidity to that is why it is a closes system.
Click to expand...
So Andy, when you get the "rumble strip" sound / sensation, does it feel to you like it might be a rapid change back and forth between gears or a rapid lock / unlock of the torque converter? I've heard of that happening before on some GMs, but never on a Toyota. Based on what you're describing, and the fact that it's happening intermittently, it doesn't sound like joints / shafts to me. It sounds like either an electric or hydraulic transmission malfunction.

I know he's out of town right now (so he may not be checking MUD), but have you run this issue by Rob? His depth of knowledge on particular things can be pretty remarkable.

PM me if you need his cell #
 
I don't think it feels like it is going in and out gear but it could be the torque converter either locking/unlocking or slipping and then finally catching. I read something on mud about how the torque converter doesn't fully lock until 4th gear and that fits in with my problem.

I'll text Rob and see if he can do some diagnosing over the phone.
 
Well brought it to Furr and they said it was a hard transmission shutter so it is going to get a rebuild at a tune of $3500. Uggghh
 
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