PDA

View Full Version : possible gearbox problem...

wheresmylicense
08-22-2005, 10:59 AM
i have a manual 97 civic, and lately it's been acting sort of weird. whenever i go to shift into third gear and it's above about 4000 rpms, it sort of grinds through the gears, making that sound it makes when you try to force a shift. only difference is it doesn't put up too much resistance and it slips right in.

kind of difficult to explain, but i was wondering if any of you have had or have heard of the same issue. maybe the syncronizing mechanism isn't working right?
ebpda9
08-22-2005, 11:52 AM
maybe your clutch is starting to go.
AzCivic
08-22-2005, 11:54 AM
sometimes worn engine mounts can cause a shifting problem, but if you try gm's synchromesh FM and it goes away then yeah its probably the synchro's.
pdiggitydogg
08-22-2005, 12:11 PM
Originally posted by AzCivic
sometimes worn engine mounts can cause a shifting problem, but if you try gm's synchromesh FM and it goes away then yeah its probably the synchro's.

My thoughts exactly
JDMFantasy2k
08-22-2005, 05:18 PM
god bless synchromesh FM
wheresmylicense
08-22-2005, 10:26 PM
can someone explain syncromesh fm?
JDMFantasy2k
08-23-2005, 04:37 PM
gm makes two versions of their synchromesh tranny fluid, a regular version, and a friction modified version. You want the friction modified version. I guess it just has a better "healing effect". But it takes time (like a week or two) and it usually doesn't come cheap. The GM dealer wanted to charge me like 11.50 a fucking quart and i talked him down to 10 ;) Well worth the cash though. Any GM dealer should have it. If you need to, search for it on honda tech for the part number
pdiggitydogg
08-23-2005, 05:58 PM
Its a synchro bandaid - coats them and magically makes the grinding (slight grinding) go away after around 100miles.
In no way does it fix the problem and in no way do I know how it really works
JDMFantasy2k
08-23-2005, 06:10 PM
yeah i forgot to say that
AzCivic
08-23-2005, 08:02 PM
fixed my grinding problem almost immediatly in my civic, and worked the whole time I had that tranny in the car. its called a "band-aid" but i really haven't heard of anyone who has used it and had their grind come back. the only time i did hear of a grind come back it turned out they werent using the FM.
wheresmylicense
08-24-2005, 10:55 AM
awesome, thanks a lot... i'm going to have to check that out now...