Driveline Squeak

I just changed the gear oils in both diffs as well as the tranny and the transfer case, the oil that came out of the diffs was pretty bad but no major filings or metal pieces on the drain plug. About 2 days after I changed those oils I noticed a squeak noise during acceleration up until about 50 kmh. It is a chirping squeak type noise that sound like it is coming from under the middle of the truck. I tried greasing all the u joints but that did not make any difference and none of them feel loose or sloppy at all. I cant quite pinpoint the source of the noise but it sounds like it is coming from the carrier bearing area but it could be coming from the rear end as well.

Any ideas to help me actually determine what is the issue, I would rather not pay the dealership to diagnose this if I dont have to.

Thanks

 

Is driveshaft a 2 piece w/dbl cardan joints? Could be a carrier (center) bearing, some audio would help too....

 

not really thinking this is the answer but want to throw it out there. If you have LSD or better, your diffs will require an additive/lubricant. Open diffs don't require anything but gear oil.

 

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Thats right , LSD diffs take something other than open diff or the TRD

good point, something to consider...

 

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nevermind , he's TRD

 

I have the open diff with the locker so an LSD additive is not the issue. I used redline 75W90 GL-5 in the diffs and MT-90 in the Manual trans and T case. I really hope the issue is not in the diff but I realized there is a zerk in the middle of the carrier bearing that you have to line up with the hole in the bottom by turning the driveshaft. I will grease that up and see if that changes the noise. Does anyone know if you can buy a rebuilt driveshaft to fix a bad double cardan joint? Toyota wants $1700 for a new shaft.

 

try greasing the driveshaft slip yoke, and u joints before the double cardan BUT
they're rebuildable - read this:
http://forum.ih8mud.com/40-55-series-tech/156646-toyota-cv-double-cardan-joints-rebuildable.html

 

I had my truck by a shop here in town and they took it for a drive pulled the rear driveshaft for me. They said the u-joint at the rear seemed fine. They said nothing was clearly wrong but they suspect the double cardan joint, they greased it up and the noise is still there but is not as loud as it was. Any ideas as to what I can do to avoid replacing the whole driveshaft?

 

They say if the dbl cardan goes out its driveshaft time, but im not 100% sure you couldn't punch out the old ones & replace with upgraded ones..

 

Grease those drive lines!!

 

The double cardan u joints aren't easily replaced, there isn't a specific size for it according to the dealer and part stores, meaning they're not meant to be replaced. I replaced them one time with a set that matched up pretty close and it did work but it wasn't long after that I said fuck it and went with a 1 piece instead just cause I didn't trust it.

 

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I think Chris4x4 told me that there were 2 versions of the dbl cardan : non greasable & greasable.. mine have zirks so must be the updated version

 

Oh right on,good to know

 

I greased each zerk on the driveshaft one by one and took the truck for a drive after each one and greasing each joint did not make any change in the sound. I dropped the carrier bearing and it seemed to rotate smoothly with no rough spots or noise. I have also been noticing a rattling sound under acceleration, thought it was a loose hear shield or skid plate but they are all secured tightly.

Any ideas?