When I'm driving, (I'm not sure how fast you have to be goingno faster than 10 ), but you can't put your car into first. Like if i'm coming to a stop on a slight up hill, or pulling into a driveway or parking, when I down shift from second I can't go into first., if i'm going faster then like five. Second is too low, it feels like it wants to die and sometimes does. I have to either stop and shift, or go super slow and shift. Sometimes I want to shift back into first and I can't. I have no problem shifting from a stop or in and out of first. just in the situations listed above. I'm sure others have the same issue. Does anyone know how this works(mechanically or electrically...), or how I can disable. Prefferably how I can disable it, Thank You So Much!!!! Its a 95 civic d15b7 manual.

 

sounds like your synchros are going in your tranny. but a little more difficult the faster your going is normal. try revving the motor a little to align the synchros.

 

That's exactly what I have with my tranny. And exactly as sacicons said...rev your engine up and try to catch where it will fall in.

 

I asked my dad and he said that it was a safety precaution. and that it does that in other gears. he said if i was in 5th ger going 90mph on the freeway, and tried to put it in 2nd. it would't. I wouldn't try it, but i can see why this is so. so that you don't ruin your transmission. I tried what you said. and it still didn't work. If I'm holding the clutch shouldn't I be able to at least put it into any gear and still hold the clutch regardles of whether or not the engine revs and the transmission match up?!?!
Do you know how to disable what i'm talking about?

 

yeah, it should do it a little, but if he almost has to completely stop, then its a problem, if im slowing down, i can put mine into first at or near redline with only a little blip on the throttle. and thats just to help save my new clutch.

 

You need to rev match. Let your clutch out while you are in neutral and rev the engine a little bit. Then, while the rpm's are still up, push the clutch down and it should go into 1st pretty easily. Only thing I can think of is your synchros are shot.

 

how would I know whether my synchros are shot. What are they?

 

Synchros, or synchronizers, are put in manual transmission cars to eliminate the need for double-clutching. They allow the collar (connects gear to the driveshaft which goes to the wheels) and the gear to make frictional contact before the gear is actually engaged so that they can synchronize their speed, hence the name. If your synchros are worn down, it will be very hard to put the car into gear, and the gears will sometimes grind.

 

I think that could be possible. sometimes the gear doesn't go in. it grinds for a second and then I just shove it in there and works fine. do you know how much a job like this cost. Is it possible to do it yourself. I've got a pretty good setup in my garage. I've got a hot rod I'm building, So tools and equipment are not an issue.

 

Don't try to rebuild your own tranny unless you already have a new one to use for when you f*** it up. The reason your car won't go into first when you're moving faster than about 4 mph is that Hondas have very narrow first gears, and thus they only have low-speed synchros on first gear to keep you from making a mistake. Also, why are you compression braking in the first place?