So, I just finished the Isuzu to Getrag (F23) swap because my old Isuzu was making a crazy-ass noise. Guess what? It's baaaaaaaack...

Here's the particulars:

The noise happens when:
I'm in 4th or 5th gear (though it may happen to a lesser extent in other gears and I'm not hearing it over the exhaust)
I let out of the gas and coast in gear (ie. I'm driving, notice that I'm going a bit over the speed limit, so I let off the gas and let it coast in gear to slow down)

The noise does not happen when:
I'm accelerating or the transmission is under load
I coast in neutral

It goes into gear perfect, and there are no "physical" issues with the trans' performance

The is the exact same freakin' noise that my Isuzu made, and when we pulled the Isuzu out and spun the input shaft by hand, it made a wicked grinding noise in the bearing area like it had rocks and sand for a bearing. The fluid had metal shavings galore in it as well (I'll drop the fluid in the Getrag tomorrow and check it out). But, on the new Getrag (rebuild with 20,000 KMs on it), when we did the same thing, it spun like butter with no noise (this was only when done by hand though). Also (when it was in the car still) the Isuzu noise was loud as all hell, and made the noise in every gear from 2nd and up, and also did it while accelerating and decelerating.

I'm lost here, 100%. For both transmissions to have the exact same problem to a "T" just blows my mind. I just spent over $2000 (that I don't have) on this new transmission between the cost of it, parts and flying back home originally and then back out again (14 hours away).

So, if anybody has any ideas what the crap this noise is, I'm all ears. I'm pretty much throwing out any theory now:

I don't know if it's some wacked thing sound-wise with the upgraded clutches (had a SPEC Stage 3 in the Isuzu and now a Stage 2 in this one)?
Maybe some weird-ass sound that's magnified in volume by the prothane mounts when I'm in those gears?
Possibly a noise that the LSD (TeamGREEN) generates? (my old Isuzu didn't have an LSD)
Maybe I'm trowing too much boost at it and I'm the one screwing these trannys up? (don't really see this though, as I'm only pushing 15 PSI when I feel like running it, and there's tonnes of guys here doing that and more with no problems)
Could something have been out of spec during the install and caused this?

Like I said, I'm lost at this point (unless that stupid ass bearing at the input shaft is messed again on my new, just installed tranny).

!THANKS! to everyone and anyone on this.

Oh yeah, I'll try to get a sound clip tomorrow as well and then I'll post that for your listening pleasure.

I guess I should elaborate on the "noise":

It's like something is contacting another part while it's spinning, so, like a metal-to-metal rubbing/grinding noise while spinning.

I sounds clip would be really helpful.



FU Tuning

Alright, so I dropped a cup of fluid at work and nothing out of the ordinary. There were minute metal flakes when I held a light to it, and just to verify, I grabbed a sample from a '97 Cavi (120,000 KMs on it) and the transfer case of an '07 Dodge diesel (20,000 KMs on it). They showed the exact same amount of metallic particles as mine in their fluids, so again, nothing out of the ordinary. On my Isuzu, when it was busted, actual little "chunks" of metal came out with the fluid.

This in no way puts me in the clear though. There's a good chance that my new tranny could be on it's way out in a similar fashion as the Isuzu, but is just not as far along in the breakdown process yet, so, no chunks to exhibit yet, just the sound in 4th and 5th gears, for now.

I'll try to get some sound for tonight.

did you replace the axles or hub bearings ?

[quote=97cavie24ls(™)]did you replace the axles or hub bearings ?

Axles, yes, couldn't get the Isuzu ones to match up.

Could be the "growl"... a google search seems to have it be a semi-common issue, cross-platform/brand

http://www.google.com/search?q=getrag+growl

BTW, did that coolant temp sensor plug work for the VSS?

Kardain wrote:Could be the "growl"... a google search seems to have it be a semi-common issue, cross-platform/brand

http://www.google.com/search?q=getrag+growl

BTW, did that coolant temp sensor plug work for the VSS?

Yeah, I had thought about the Getrag growl after I posted. The only thing stopping me from simply accepting that that is what it is is that it's the same damn noise my Isuzu made (though this time, it is not made when accelerating). Either way, it's pretty much the sound of the input bearing going to crap. But, I'm not sure anymore...

I tried to get a sound clip tonight, but apparently my girlfriend thought it would be cool to let me use the camera after she had drained the batteries 99%. I got one clip, but it sucks. It's going to be hard either way to hear it over the BOV and exhaust when I let off the gas, but I'll definitely try (hopefully tomorrow night).

As for the VSS, my buddy actually nabbed one from a wreckers the day before I flew out there (cost him zero bucks too). Wired it in when I got there (thank god for having access to a lift when I was there), and now all is well in that department. Thanks.

Did you ever find out what this noise was. I just got done putting in the LSD, spec stage 3 clutch, and alum flywheel. I am getting a noise also when coasting in gear and in the higher rpm's. Its not a grinding noise, it sounds like a vibration to me. The trans shifts great, the clutch grabs, the slave is still working, i am at a loss here. I have checked the Fluid (mobile 1 atf) twice and there wasnt any shavings. I have already dropped the trans twice trying to figure out what is going on. When installing the lsd is something suppost to be lubricated? Is there a way not to put it back together properly? All i did was crack the case, take the diff out, put the lsd in, and put the case back together.

Its a pretty common noise..... I get it in all of my cars that have the prothane trans mounts...... more so in my getrag though. Its just gear noise, from what I can tell.

then again, I havnt heard your noise, so I cant say.



SPD RCR Z - '02 Z24 420whp
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Didn't even know this thread was still kicking around...

As for the sound, no, I still haven't pinpointed it, but it sounds a lot like the cry of a dying input bearing, and even more so now. It's slowly getting worse, very slowly, but I definitely notice it. It's making it's way into the lower gears and is louder up top. No shavings yet though, so I'll just ride it out for now and see what happens. Hopefully it's a long, very long ride this time though...

Throw out bearing?



PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

I just did a clutch and flywheel swap (spec stage 2 clutch and fidanza flywheel) and noticed the same thing. Nice to know that's normal



http://www.cardomain.com/ride/676422/1

Yeah i think its just gear noise...we just got done taking the trans out again...Still no shavings!!! Still have about 200 miles on the break in and then its go time. The clutch still looks good. Hopefully i can make it to the track and see how the lsd does. Hope to have about 2.0 60'!! Thanks Brian

Quote:

I have checked the Fluid (mobile 1 atf)

Umm im just guessing that ATF belongs in an Automatic tranny, not a manual. When i resealed the 5-speed on my old grand prix i had to go to the dealer and get special GM syncomesh gear oil for it. That was fun, the dealer could get it, but didnt have the part number and Autozone had the part number, but couldnt get it.

Granted ATF could be the proper lubricant for the Getrag(i have never worked on one, yet), but it just doesnt seems like it would have the right viscosity to protect the gears.

Tinkles wrote:

Quote:

I have checked the Fluid (mobile 1 atf)

Umm im just guessing that ATF belongs in an Automatic tranny, not a manual. When i resealed the 5-speed on my old grand prix i had to go to the dealer and get special GM syncomesh gear oil for it. That was fun, the dealer could get it, but didnt have the part number and Autozone had the part number, but couldnt get it.

Granted ATF could be the proper lubricant for the Getrag(i have never worked on one, yet), but it just doesnt seems like it would have the right viscosity to protect the gears.

^^^ this guy has it right.

now im not saying this is your case chad... but, when i swapped grease in my izuzu i used royal purple sythetic in it and the damn tranny serious sounded BAD, a lot of the time it sounded like an old 60's school bus lol, whinning to all hell and making grinding noises etc, not to mention it went it gear hard as hell ESPECIALLY reverse.

said F this and found out i needed that gm syncromesh (thank you ). went to the dealer and got some, drained out the royal purple and put in the syncromesh and it cured the issue almost immediatly.

My Isuzu was making a grinding noise on deceleration because the spider gears in the diff had been worn down. This was associated with the chunks and such like you mentioned. I'd say best way to check that is to pull out the VSS as it tends to attract all that crap, if that's what's happening.

Transmission Fluid Check
Important: Inspect the fluid level only when the engine is off. Ensure the vehicle is level. The transaxle must be cold.

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Remove the level check plug.
Verify that the fluid is up to the opening.
Perform the following porcedure if no fluid is visible:
4.1. Lower the vehicle.

4.2. Add GM Dexron III Transmission Fluid, or equivalent, to the level check opening until the level check opening begins to leak fluid.
4.3. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

This is from gm service info. The getrag takes dexron III.

Quote:

The getrag takes dexron III.

Ok so it does call for ATF, maybe switching to the Dexron will take away the getrag noise? I presonally wouldnt trust ATF im my manual tranny, but if its what the manufactor says is suppose to be in there i guess i'll use it.

If GM service info calls for Dexron III then where are people finding the info about the syncromesh fluid? This noise is really annoying, I'd like to get it taken care of.

yeah what fluid did you use to fill the tranny because im sure anything other than that could have an effect on the trans lubrication system. If your using a different fluid there could be some issues and your saying its getting worse have you sampled the fluid again?


*2012 mazdaspeed3*