I have a 2000 Civic Si. When shifting at high RPM's from 1st to 2nd I can feel a slight crunch when I shift. It only happens between 1st and 2nd and I don't seem to be able to chirp the 1-2 shift anymore. I just changed my MTF today with regular Honda MTF and it is still doing the same thing. Do you think it's my synchro? How can I fix it? I heard something about burnishing a gear to get it to stop grinding but I'm not sure how to do it. If that doesn't work how much will it cost to get the 1-2 synchro fixed, since I doubt Honda will cover it. I mean what am I supposed to tell them, "My gear grinds from first to second when I shift quickly at 8000 RPM's. Sure. Also, will I be losing any performance with my tranny doing this?

 

ttt

 

Ok I tried shifting at the same RPM but really slow and no crunch. Any ways to fix this problem?

 

Classic synchro wear/damage. No offense, but this is almost always a driver-induced condition.

I would suggest you change your fluid ... but you already did that. Red Line MTL or MT-90 might lessen the grinding ... but I wouldn't bet too much money on it.

If you don't want to have the tranny repaired/replaced ($$$) you'll have to just be extra-gentle with it from now on. Real race cars don't have synchromesh transmissions. They usually use straight-cut gears because the synchros can't put up with the stress and abuse of racing.

--- Bror Jace

 

wear from power shifting no cars like it exspecially hondas from 1st to section

 

I've never power-shifted, I don't really know how. How much would it be to replace/repair the 1-2 synchro?

 

Also, will I be losing any performance if my gearbox is doing this?

 

You will not loose performance really unless your synchros are really shot. I would personally just leave it . Synchros can run you like 200 bucks. Just ease off on shifting from 1st to second then shift hard on all the rest. All my hondas including my S2000 do this. The honda dealer ship said its not really avoidable unless you want to spend big $$$$$$$$$$$$$$$

Hope that helps

 

It's more than likely nothing wrong with your synchro's...and if there is, it's a result of improper shifting. I'm saying this b/c it's only happening with quicker shifts. When your synchros are close to dying, they'll grind a lot more frequently than with just hard driving situations. Learn to shift more smoothly, and your tranny will live a lot longer.

Also, flushing out the clutch fluid will help improve the clutch feel and prevent fluid boiling.

 

It's more than likely nothing wrong with your synchro's...and if there is, it's a result of improper shifting."

Well, I'd say the improper shifting has damaged a synchro ... and the 1->2 shift is usually the first one to show this.

"I'm saying this b/c it's only happening with quicker shifts. When your synchros are close to dying, they'll grind a lot more frequently than with just hard driving situations. Learn to shift more smoothly, and your tranny will live a lot longer."

Synchros usually don't go all at once. They become worn from hard, too-quick shifting and at first you get notchy shifts, then slight grinding and then the grinding only gets worse. The harder you throw the shift, the harder a synchro has to work and if it is damaged and not up to the task, it won't engage properly ... and grinding is the result.

The cheapest way to fix this is to replace the tranny with one from a wrecked car. I think I know a dude who had this done for $300 including the tranny. Every locality is an adventure, though, and it will require some calling around.

I think, though, that driving around with this injured tranny will teach you a bit about shifting. Slamming the car into gear ASAP is abusive. Instead you need to time the shift carefully and engage the gears more smoothly. Shifting the injured tranny so that it doesn't make a grinding protest witll show you the proper way and hopefully get you into that habit for the rest of this car's life as well as all the rest of the cars you'll own.

Power shifting, for those that don't know, is when you don't take your foot off the gas. You merely tap the clutch and shift really, REALLY quickly. It is REALLY abusive but in the days before fuel injection and computer controlled electronic ignition it was pretty easy to miss a shift and blow your motor as well as lunch your tranny.

--- Bror Jace

 

i work for a honda dealer, remove all aftermarket engine parts, and have the tranny rebuild warrantied, just be sure to remove all aftermarket parts from engine, hope this helps

 

I think that removing all aftermarket parts would be a PITA. Do you think I should just live with it?

 

The S2000 has a bulletin on 2nd gear crunch- the gears/synchros need to be replaced with "improved parts"- it should be under warranty. They also have a clutch disc bulletin for the raspy gear noise you get in second gear during decel. It also depends on what year it is. The 99-00 Si civic also had some synchro bulletins. It may be hard to get covered under warranty if you have a bunch of mods.


[Modified by fixhondas, 1:04 AM 3/25/2002]

 

nice it is a stock i mean bone stock not even one thing done to it. It is a 2001. THX ill check that out