since the noise was less noticable during the cold months, have you tried running thicker fluids in the tranny and/or rear end?

 

No, I'm running the stock fluids. The dealer put synthetic in the tranny since I was having a hard time shifting when temps were below freezing. I'm sure the dealer put normal fluid back in after the rear diff change.

Someone else as to have this noise! It is sometimes accompanied by a slight droning. It's one of those things that someone could drive my truck for a few days and not notice, but once you hear it and lock on to the noise, you can discern it over the A/C and radio at times.

The only thing that hasn't been changed out on the truck's driveline is the transfer case. I would think that the transfer case would make noise under most conditions if it were the cuplrit. like I said this noise only happens during that split second when letting off the gas from a steady cruise. Imagine the noise a skateboard wheel makes if you spin it hard...

 

I have the same issue on my 06 Tacoma 4x4 Reg Cab. Here is my post over on TTORA about it:

http://www.tacomaterritory.com/forum/showthread.php?t=43824

It sounds like you have already had some of the work done that the dealer is talking about doing to mine.

I'm still waiting for parts.

 

Just read your post on TTORA. I was also thinking the noise may be related to the slip yoke on the drive shaft as temperature seems to be a factor on my truck. I looked for a grease fitting to pump it full of grease, but of course there isn't one.

I was going to take off the front of the shaft and rotate it 180deg to see if that helped last night. I got the 4 nuts off, but the shaft was stuck on the transfer case output. A screwdriver and hammer still wouldn't budge it. Well, it got dark so I put it back together for another day.

 

I'll be interested to hear if that works out if you get a chance to try it again.

I am kind of curious if Toyota made a batch of shafts that are not the proper diameter where it mates with the slip yoke.

I will post back if the replacement driveline improves this issue.....if I can ever get the dealership to give me a firm ETA.

 

My '05 truck was built Feb of '05. Last october, is when they tried to fix this noise and the driveshaft was on backorder for 1 week.

There has to be more than one factor, otherwise it would be simple to fix. Probably, the balance of the shaft has a lot to do with it as well as rear pinion angle.

 

Interesting. They sure are taking their time finding my drive shaft.

You probably have a point that the root cause may be a little more complicated than the tolerance issue the tech identified on mine.....but I can hope.

 

gonesurfing,

I updated my thread over at TTORA (see my link earlier in this thread). The new driveline apparently fixed the issue.

Best of luck..

 

I'd be interested to see if the noise stays gone for good.

I'm taking my truck in next week for the clutch pedal TSB and have been debating if I should bring it up agaion or not. Last time they changed every damn part on the truck and it didn't help. I'm going to try and rotate the driveshaft again this weekend if it doesn't rain. I'm also putting a camper shell on the back Saturday and have been hoping that maybe the extra 160lbs will improve the pinion angle enough to help.

 

Thread Revival!

Same rattle, it feels almost like the transfer case hasn't completely disengaged and I'm getting feedback from the driveshaft to the front diff. it is happening when I let off the throttle and am coasting. Almost a vibration almost a rumble. I really wish I could figure out what is making this noise. (06 dbl cab, sr5 4x4)

 

I'm glad to hear other people have it too. I have a 06 access cab with the 6 speed. Any time I am in neutral or when there is no load on the driveline I get a horrible rattle when I go over anything like train track, speed bumps, bumps in dirt roads. Even when I am wheeling really slow if I shove the clutch in while going down over some rocks or something it rattles. About ready to sell my truck it pisses me off so bad.

 

I just asked the dealer about that very thing and he said it was normal. He said it was designed that way.

 

Does greasing the drive shaft help any?

Mine doesn't do this, and it didn't do it when I had the stock drive shaft either.

Push and pull on some stuff under there and see if you can get anything to move around, and make the sound.

 

yeah I have pushed, pulled, rolled and lubed. Nothin helps. Went to the dealer and we took a brand new one out and sure enough it did the same thing. Just said that they are designed with a certain amount of forward and reverse play in the driveline setups. The tech had never had a truck brought in with this problem and couldn't believe how loud it is. Just kinda sucks that this is the way they are designed. There was another guy on here that went to the dealer and took out a brand new 08 and sure enough with the 6 speed it made the rattle. Those 04's are looking better and better....!

 

The noise on my truck is gone, and has stayed gone for 2 years now. The extra weight of the camper shell changed the pinion angle just enough to keep it from resonating.