transmission Grinding?

[Josh]

I always used to be able to put my car into 1st when slowly rolling forward or back (with the clutch pressed in) and it go in fine... But now it grinds everytime I do that and sometimes even when I'm at a complete stop. Any ideas of WTF is going on?

[gema]

Mine is doing the same thing, and I've been told there is a problem with my synchros. As to how to fix it, I'm stumped. Mine grinds into 3rd nearly every time (just a little) and 1st occasionally I have to force it into. Bummer. Hopefully we both get the problem sorted out.

[MainEvent212]

clutch is going out?

[Altiman94]

could be a worn out clutch, could be synchros.

[Nismo_Freak]

Once again... there is no synchro on the 240SX transmission in 1st gear.

What's happening is that the transmission is still spinning and your trying to jam it into gear and it's grinding.

[rousie13]

Yeah I have the same thing. I replaced the clutch this summer, but the car has 167k, so what do you expect. The synchros aren't that bad, just notice it every once in a while.

[Josh]

Clutch is pretty new, put in in February, and as far as synchros I was under the impression 1st gear wasn't synchronized (can't remember where I picked that up).

[Josh]

Allright, Nismo, you verified what I thought... So whats causing that? Note that I said it does it sometimes when I'm standing still...

[gema]

Okay...that answers one question and raises another.

Sometimes it will offer resistance entering first gear from a complete stop. What's up with that?

The grind going into third must be synchros...but what's up with First? More importantly, how do I fix these problems?

[Josh]

Yes, I would think your third gear problem would be the synchros... But I'd like to know what this is, or if I just quit knowing how to drive because it just started monday...

[Slippery S14]

I have this issue as well for both 1st and reverse. I just slip it back into neutral and release clutch then clutch in again and shift, works well everytime I have had this come up.

Im not worried about it until it starts popping out of gear.

93 S13 Stock

[ss240]

Alright guys...

I had the exact same grinding in 2nd... then slowly it spread to 3rd. I too was informed it was synchros problems....

The only rational response I got was to pick up a used transmission and install it.

My car went in today to have a new clutch kit and a used transmission I picked up installed.

I will keep you updated you if you want, just send me a PM.

Hopefully this will fix my syncros problems and I will be able to downshift finally.

Word has it that the nissan ka transmission's are notorious for their syncros going on them

[Josh]

But dude, 2nd is different... 2nd is synchronized where 1st isnt... I don't know, I just push the clutch in, put it in second, then to first and its cool... no grinding that way...

[crzycav86]

Sometimes it will offer resistance entering first gear from a complete stop. What's up with that?

I think that happens for the same reason(No syncro in 1st gear).

When you try to put the car in first from a stop, its difficult. Why? Because the transmission is still spinning, although the clutch is disengaged, and the car is not moving. **WARNING Prepare to be confused: Think of the transmission as 3 parts. One part is the motion coming from the engine, one part is the motion from the wheels, and the third is the transmission itself. Two ways to surely stop the transmission(which, in your case, is what you want to do in order to shift to first). The first way is to engage the clutch with engine turned off. This isn't very reasonable, for obvious reasons, so that leaves you with the second option. Have the car stop with the transmission in gear. This will stop all the gears from moving, and will allow you to shift into first easily.

Now, to get back to what I started saying at the beginning... Your transmission was still spinning because you put the car in neutral (and engaged the clutch)and then later came to a stop. Since nothing stopped the transmission from spinning(the driveshaft wasn't engaged to the transmission as the car came to a stop), the transmission just freewheeled until it stopped due to friction(and the friction you created by trying to shift it into 1st with the transmission still spinning).

I'm sure you all are very confused with this. Try reading the article about transmissions on howstuffworks.com There is a good diagram that will help you understand.

But, the way I am able to shift into 1st at around 5-10mph is by double clutching. This technique matches the two gears together by reving the engine with the transmission in neutral. This is nothing new. It's a very common skill...

Also, I was thinking that It would be possible to change gears without using the clutch. When you want to shift to second, lets say, you put the transmission in neutral, then let the rpm's drop until its where it would be in 2nd gear at that speed. I have yet to try this, but I think it would work.... enough writing for me...

[gema]

Strangely enough, I understand most of what you're saying. Very sharp! Thanks for the info, and I suppose braking in gear would be a better option for now, as opposed to pushing in the clutch and braking...ooooh knowledge is great!

[ss240]

Well guys... got the 240 back (see my post above)

The car is running awesome... new clutch and the used transmission from a wreckers

No grinding in any gears... i can downshift and upshift through every gear fine!

So my conclusion: synchros was the prob..

hope it helps y'all out

[Nismo31]

im from ny n im going to need a new transmission soon..i was told that because in my lower gears, it grinds as i accelerate..i was told that it needs new seals or bearings or something..anyone ever have this problem..also i see trannys from 200-1000...idk wut to get ..hey ss240..how much u spend on urs n how many miles..also wuts the goin rate for installation! thnks guys!!

[ss240]

im from ny n im going to need a new transmission soon..i was told that because in my lower gears, it grinds as i accelerate..i was told that it needs new seals or bearings or something..anyone ever have this problem..also i see trannys from 200-1000...idk wut to get ..hey ss240..how much u spend on urs n how many miles..also wuts the goin rate for installation! thnks guys!!

I paid $300CDN ($230USD) for mine... I looked it up on car-part.com and it had 154000km (95000mi) on it.

Now I believe I got a good price for installation. I paid $750CDN ($575USD) to my mechanic and he put a brand new clutch in and installed the transmission with new seals etc.

The installation itself should only run ya around $500CDN ($385USD)

[crzycav86]

I also understand the explaination presented by " crzycat 86 "above. Very good.

It's crzycav86...

[Josh]

Also, I was thinking that It would be possible to change gears without using the clutch. When you want to shift to second, lets say, you put the transmission in neutral, then let the rpm's drop until its where it would be in 2nd gear at that speed. I have yet to try this, but I think it would work....

Yes, it will work... You just have to let the RPMs fall, but not too far or it will grind...

And, I understand that the transmission gears would still be spinning but the fact that I've had the car for 2 years and have drove it the same for those 2 years and this has just started is the part that confused me...