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Location:
Townsville
Registered:
August 2005
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 2ndGear a bit crunchy
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Tue, 11 October 2005 02:14
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Hey i own a stock 1994 AE92 corolla and when i change into 2nd (Either up or down) it crunches really bad in the high rev range (4 to 6000rpm). is this a common problem or is it unique. ive noticed a grind when i shift into reverse but most oldcars do this, the 2nd gear is a completely different sound. ive also noticed my clutch is alot shorter than other cars, could this be causing my problem??????? Please Help
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Registered:
May 2002
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Re: 2ndGear a bit crunchy
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Tue, 11 October 2005 02:32
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It could be that your clutch is not fully disengaging which can create the problems you are experiencing (but would normally be evident in all gear changes)
Given that a clutch adjustment is relatively easy I would try that first.
Then try new g/box oil.
If neither of those make a difference then it's probably going to be a worn synchro and will need to be replaced.
Start with the easy and cheap solutions and work your way toward the harder and more expensive ones using a process of elimination 
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Location:
Pine Rivers QLD
Registered:
April 2005
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Re: 2ndGear a bit crunchy
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Tue, 11 October 2005 02:40
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In my younger days i used to put the car in second and drop the clutch doing about 60 so i could get a "chirp" so mine does that now, but only shifting down at high revs. Since it seems to only be second i would lean towards the syncro. Take it for a drive and try "double clutching" and see if you can shift it with out the noise, as if i double clutch my second it doesn't seem as bad. But yeah before you go spending money try the cheaper stuff first.
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Location:
eastern suburbs, melbourne
Registered:
March 2005
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Re: 2ndGear a bit crunchy
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Tue, 11 October 2005 02:49
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i have heard good things about redline MT90 gearbox oil, removing notchy-ness in gearboxes.
what is double clutching?
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Registered:
May 2002
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Re: 2ndGear a bit crunchy
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Tue, 11 October 2005 02:55
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| Quote: |
what is double clutching?
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this has been discussed in great depth, a search will bring up several threads full of various versions of what double clutching is.
The bogan version of double clutching is simply used to induce wheelspin in underpowered fowlcoons by depressing clutch, increasing engine rpm, side step clutch, wheel chirp, 15 year old skank is impressed and is yours for the banging 
NB: the above example of double clutching is not actually double clutching.
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: 2ndGear a bit crunchy
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Tue, 11 October 2005 03:33
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this is a common problem with these geraboxes and its not too hard to find another one. Sometimes it can also be a crook mount or the gearbox oil may be too thick or need changing start with those things then look at the gearbox once you have tried them all. some people use atf in these gearboxes which i have seen make a difference and have had no problems with the gearbox while attending many track days
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Location:
Forster NSW
Registered:
September 2004
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Re: 2ndGear a bit crunchy
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Tue, 11 October 2005 03:36
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That would be a common problem (especially at those revs). 2nd gear syncros cop the most punishment, so usually give way before anything else.
I find ae92's to have short clutches, so I doubt that would be the issue. If you want to check the clutch is working as it should be, get the front two wheels up on stands, put the car in gear and depress the clutch, the wheels shouldn't spin.
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Location:
Forster NSW
Registered:
September 2004
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Re: 2ndGear a bit crunchy
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Tue, 11 October 2005 03:40
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| 4agte wrote on Tue, 11 October 2005 13:33 |
this is a common problem with these geraboxes and its not too hard to find another one. Sometimes it can also be a crook mount or the gearbox oil may be too thick or need changing start with those things then look at the gearbox once you have tried them all. some people use atf in these gearboxes which i have seen make a difference and have had no problems with the gearbox while attending many track days
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The ATF is a good trick, I changed the oil in mine last week and it was crunching horribly before i mixed some atf into it, could barely get it into second without double clutching 
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Location:
Adelaide
Registered:
January 2004
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Re: 2ndGear a bit crunchy
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Tue, 11 October 2005 05:12
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How much ATF do you put in to stop crunching? My box had a nulon treatment and it supposedly stopped it (before I brought it) but it's crunching again.
Might be worth a shot
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Location:
Pine Rivers QLD
Registered:
April 2005
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Location:
Forster NSW
Registered:
September 2004
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Re: 2ndGear a bit crunchy
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Tue, 11 October 2005 05:51
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It depends.. it may not stop it all together, but it certainly might help. Depends how bad the syncro is shot.
I put in 500mL of ATF, that was after it was already full of the other stuff though. So what I did was put the car up on stands, so the gearbox was tilted, and that way I could get the extra fluid in there without it just draining out on me. Put the plug in, went for a quick drive to mix the fluids together (though ozmosis would probably do this anyway), parked it on flat ground and took out the fill plug and let it drain the extra fluid out.
Much easier shifting and no crunch downshifting into second provided I'm not downshifting too early (40km/h approx) - that's once it's up to temp
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Location:
Adelaide
Registered:
January 2004
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Re: 2ndGear a bit crunchy
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Tue, 11 October 2005 06:02
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Wouldn't it be easier to drain some of the fluid out, then add the ATF, that way you still have the same amount of ATF as you put in there?
Or drain all the fluid, mix the ATF with some gear oil and put that in there?
Speaking of fluids i need to get back to my fluids work for uni
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Location:
Forster NSW
Registered:
September 2004
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Re: 2ndGear a bit crunchy
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Tue, 11 October 2005 06:08
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| Lachie wrote on Tue, 11 October 2005 16:02 |
Wouldn't it be easier to drain some of the fluid out, then add the ATF, that way you still have the same amount of ATF as you put in there?
Or drain all the fluid, mix the ATF with some gear oil and put that in there?
Speaking of fluids i need to get back to my fluids work for uni
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Yeah, but it's not easy to drain out just a little. And I'd just spent a $20 on new oil! 
Next time I'd mix it in to start with.
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Location:
Townsville
Registered:
August 2005
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Re: 2ndGear a bit crunchy
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Tue, 11 October 2005 22:56
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What is the Synchro? how hard are they to replace and how much do they cost? is it a mechanics job or can i do it with a shifter?? ive also been told that the gearbox from a celica would bolt straight on, would this be a better option??
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Location:
Forster NSW
Registered:
September 2004
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Re: 2ndGear a bit crunchy
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Tue, 11 October 2005 23:39
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It would be a specialists job. Tools required would go well beyond a shifter.
Why bother? It's only a 4afc/e anyway, they're not meant to go hard (and don't) so why not just drive it easier? Also someone's given you misinformation about the celica gearboxes.
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I Supported Toymods
Location:
Nthn Beaches, Sydney
Registered:
October 2004
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Re: 2ndGear a bit crunchy
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Wed, 12 October 2005 00:34
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I'll 2nd the good word on the redline oil, good stuff, definately worth the money. Not just for notchiness, more so for gearbox longevity under prolonged high temps/stresses eg if your car sees the track
GT
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Location:
Adelaide
Registered:
January 2004
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Re: 2ndGear a bit crunchy
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Wed, 12 October 2005 02:57
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| SpecialK wrote on Wed, 12 October 2005 08:26 |
What is the Synchro? how hard are they to replace and how much do they cost? is it a mechanics job or can i do it with a shifter?? ive also been told that the gearbox from a celica would bolt straight on, would this be a better option??
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If you have to ask what it is then theres no way you change it yourself, it's a 14hr for a qualified toyota mechanic! (and yes I've enquired about getting it done on my car)
$65 for the synchro ring (but i think it's the synchro hub and not the ring that wears) and $1300 worth of labor.
Just shift a bit slower so the synchro gets time to match the gears speed cause they just get slower when they wear
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: 2ndGear a bit crunchy
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Wed, 12 October 2005 03:50
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yeah very labour intensive job ive started pulling my gearbox apart and it aint simple infact i would say gearboxes are more complicated than engines.
not only that it will take a fair bit of time getting the g/b out of the car in the first place.
try changing the oil first it may well save you a stack
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Location:
Adelaide
Registered:
January 2004
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Re: 2ndGear a bit crunchy
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Wed, 12 October 2005 04:22
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| 4agte wrote on Wed, 12 October 2005 13:20 |
yeah very labour intensive job ive started pulling my gearbox apart and it aint simple infact i would say gearboxes are more complicated than engines.
not only that it will take a fair bit of time getting the g/b out of the car in the first place.
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Damm straight there harder then engines. When a mate of mine was doing his apprenticship they had a rack of gearbox and if they screwed it up, they got another one to practise on the qualified mechanics fixed the one they screwed up!
Not to mention that you also need bearing presses etc to put them back together (if you change the bearings) and they usually need changing if your synchros are gone
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: 2ndGear a bit crunchy
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Wed, 12 October 2005 04:32
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yeah i havent thought that far ahead but ill probably buy a bearing press
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Location:
tas
Registered:
June 2002
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Re: 2ndGear a bit crunchy
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Wed, 12 October 2005 05:24
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Do you think adding milk could make it less crunchy?
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: 2ndGear a bit crunchy
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Wed, 12 October 2005 07:41
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| dingaling wrote on Wed, 12 October 2005 15:24 |
Do you think adding milk could make it less crunchy?
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possibly 
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Location:
Adelaide
Registered:
January 2004
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Re: 2ndGear a bit crunchy
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Thu, 13 October 2005 00:08
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why f**k around, just put ATF in there
But bananas would probably be a better idea
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