Topic: Rebuild and still makes noise!!

[ThegreatWhite]

Hello.. calling from Sweden!
I just rebuild my transmission and transfer case on my 91 toyota hilux (pickup) 22re with all the new bearings, syncros and gaskets because it had an bad grinding noise in pretty much all the gears (mostly the 5th) and it popped out of the 1st and the 3rd.
All the parts in the Transmission loked great (besides the bearings), cleaned up every part and mounted on the new parts very exactly and carefully. Mounted back the transmission on the truck and runed it for some short miles. But still i can hear an weak grinding "rasping" while i run it on the 5th gear. its not getting louder when i accalerate, only time the sound disapear is when i totaly letting go of the throttle but comes back as soon as i put my foot on the thottle again.

Do i have to take down the transmission again??!

[79coyotefrg]

just dont use 5th gear

[2manytoys]

I just had the same problem with my trans. It's hard to describe the noise but it was a kind of rattle/chatter kind of sound. Mostly noticable in 5th at highway speed. It would go away when accelerating and come back when unloaded and go away again when decelerating.

It drove me nuts for months. Oil was clean, no metal on magnet in trans or T-case. Shifting was ok but kind of "notchy" feeling. I thought the syncros weren't broken in.

I was ready to pull it when I read the debates over GL4 vs GL5 gear oil. I was running 75w90 GL5.

Some articles say it is too slick for the syncros to slow down and it has a higher sulfer content that could shorten synco life over time, etc. Other articles say it is perfectly fine running GL5.

I took a chance and got some 75w90 GL4 to try before I pulled the trans. All I could find locally was Redline. The trans now shifts super smooth and the noise is completely gone. I wouldn't have believed it if I didn't try it myself.

I'm sure people are going to chime in and say BULL, but try it yourself and see. Let us know if it works for you.

[rcks4me]

may not be the trans at all. have you checked the u joints and the rear dif for any problems?

[H8PVMNT]

My truck shifts better on GL4 as well.

The noise could be a throwout bearing or even a pilot bearing though...

I had a noisy throwout bearing once.