6th Gear Grind & Replaced Transmission

[Dezoris]

Originally Posted by Mikem53

That not going to cause an issue.. That's BS..
My corvettes, both with a T56 and the TR6060 had CAGS
Which would force the shifter from 1st to 4th gear if you were under
A certain speed. I also skip gears in this car with no issues. That's never
Been an issue with manuals.
There is something wrong with this tranny in its build from the factory..
They have some defective parts or are built with bad tolerances..
Skip shifting is common and not harmful unless there is something defective.. These trannys are not that fragile..

Had same issues in early S2000 gearboxs. Should and what actually happens are two different things.

Originally Posted by Sporran

I'm not sure why that should even be an issue - my belief is that if the synchro's can't handle skipping a gear they have no business being in this gearbox in the first place.

The ratios are quite closely spaced so why should going from say 4th to 6th in our box be any different from going from 4th to 5th in a less sporty 5-speed vehicle?

I know there's many threads on this issue and many differing viewpoints too - I'm just trying to get a better understanding of what's going on with our gearbox.

I've been driving manual transmissions for over thirty years and never experienced anything like the issues this gearbox appears to have.

Again had and saw S2000 Aisin trans during first two years of manufacturing with sams problems.

[Muskokan]

I skip 5th on the daily, because I simply don't find it necessary after coming off of 4th at 4k. Aslong as your not shifting early, then skipping a gear, resulting in bogging, I see no reason how this could hurt your transmission.

5th and 6th are also my smoothest gears to engage.

Unless I see hard proof that this could be harmful, I'm gunna go along with the theory that people simply just like telling other people how they should drive.

[Mikem53]

Originally Posted by Dezoris

Had same issues in early S2000 gearboxs. Should and what actually happens are two different things.



Again had and saw S2000 Aisin trans during first two years of manufacturing with sams problems.

It's a defect in manufacturing then, it's not a characteristic of manuals.
Telling everyone not to skip gears or use the transmission "normally" is bad advice. I would rather deal with a defect then to avoid its symptoms.
A new transmission seems to be the cure. It's not a characteristic of this one.

[Sporran]

Originally Posted by Dezoris

Had same issues in early S2000 gearboxs. Should and what actually happens are two different things.

Again had and saw S2000 Aisin trans during first two years of manufacturing with sams problems.

Much to my regret I never had an S2000 - very nice cars! What was the ultimate cause and solution to the gearbox problems they initially experienced?

[Mikem53]

Originally Posted by Sporran

Much to my regret I never had an S2000 - very nice cars! What was the ultimate cause and solution to the gearbox problems they initially experienced?

Similar to our issues.. Here is the TSB listings for the S2K. Bad 2nd gear assemblies, new fluid change.. Nothing said about issues caused by skipping gears, nonsense..

http://www.s2ki.com/s2000/topic/6814...ons-1999-2009/

[tech4pdx]

Originally Posted by Mikem53

That not going to cause an issue.. That's BS..
My corvettes, both with a T56 and the TR6060 had CAGS
Which would force the shifter from 1st to 4th gear if you were under
A certain speed. I also skip gears in this car with no issues. That's never
Been an issue with manuals.
There is something wrong with this tranny in its build from the factory..
They have some defective parts or are built with bad tolerances..
Skip shifting is common and not harmful unless there is something defective.. These trannys are not that fragile..

Bingo.. Same on my T56-equipped WS6. That came with CAGS too and skipping gears was no problem. Of course, almost everyone in my group ended up disabling that shit. I drove that car occasionally in the dead of winter (single digit temps) in Chicago. It was a rock solid unit. The trans in the twins feels like a rock tumbler by comparison. Love how people are blaming the trans problem on driving style..lol. I abused the hell out of my T56 and that motherfucker held up like a champ. Clutch dumps at 4k+, 6-4 downshifts on the freeway, well over a hundred passes at the strip, etc. All the while, our import buddies calling the f-bodies and vettes POS's.. Lmfao

[Sporran]

Thanks Mike, that's certainly interesting. The problems being encountered with the 86 gearbox certainly seem similar - let's see what Toyobaru have to say in the coming months. I wonder if there's an issue with quality control at Aisin?

[Dezoris]

I love how whenever you bring something up or raise questions people just want to talk shit on here without even knowing why.


Here read up on the links from the S2000. I went through this already had two of them. Read before you say its impossible.

http://s2000.com/forums/142883-post6.html
Post from Honda engineer about gear skipping. This trans is Aisin may have similar issues. Until we have answers or more data I would avoid skipping gears.

[ZionsWrath]

Also there was a TSB for civic si transmission, forget exactly what for but it instructed for tech to go on a ride along with owner and observe for skip shifting. Ever since I read that I always use all the gears when up shifting, double clutch rev match if skip shifting down, and rev match if shifting down one gear.

[DoomsdayJesus]

It's really disappointing that Toyota pulled this on you too. Subaru covered my 4th gear grind replacement under "customer goodwill" for a one time replacement, and said I was abusing it because I was shifting at 7000RPM.

You shouldn't have to pay a dime for this, fight them on it and talk to regional reps.

[White64Goat]

Interesting reading on the Honda stuff. I have never heard of replacing brass synchro rings with carbon fiber. That just doesn't sound right.

[tech4pdx]

Originally Posted by White64Goat

Interesting reading on the Honda stuff. I have never heard of replacing brass synchro rings with carbon fiber. That just doesn't sound right.

Dry carbon or wet? Cuz u know dat wet stuff is not real

[tech4pdx]

On a serious note, these manufacturers are trolling us hard and we are the 1%, except if you are speaking to one of their marketing guys. 10+ years later and Aisin is still fixing the same problems.. Who would of thought?? Lol

Edit: should of gotten the auto..

[Sporran]

Originally Posted by White64Goat

Interesting reading on the Honda stuff. I have never heard of replacing brass synchro rings with carbon fiber. That just doesn't sound right.

Yes, very interesting reading indeed. However when the manufacturer fits a close ratio gearbox with a short throw gearlever but we are now being encouraged not to change quickly, well it sounds to me like a design flaw being hidden by a band-aid.