skibum9199

Hey all, worried about my tranny..

When shifting from 1st to 2nd gear at 6000 or above I get gears grinding, so what gives? When I first got the car it never ground... after a while it ground at 7000.... then at 6500.... now 6000. Anything I can do?



~Jesse

relvinnian

...2 things it could be. Clutch throw out bearing is not releasing fully or fast enough, or you have a burnt sychronizer. Usually if the TOB is fucked you'll feel it in all gears, but not always. You may try draining your tranny and refilling the fluid. Usually when you grind in 1 particular gear it's a burned synchro, which requires a rebuilt tranny.

How old is your clutch? Do you feel any wierd grinding or pressure in the clutch petal? Does it make any noise when you depress the clutch? Will the RPMs STICK or INCREASE, when you depress the clutch @ high RPMs? Any of these could indicate a bad TOB or bent clutch fork.

Try to replace the tranny fluid and retest. If the above things don't happen you have a synchro which is slowly burning out. Eventually it will always grind into second, unless you do a speed specific rev-match.

-Brian

skibum9199

Ok, here goes... A while ago, my i thought my clutch was making funny noises, but it turned out to be the TOB. Worried i was f*ing stuff up., i stopped driving it and started saving up for a new one... Time passes, i still dont have money and say what the heck, i want to drive my car.. I drive it, it makes no strange noises. More time passes, noise comes back, stop driving it, etc... you get the idea From what i've been told, my clutch is fine, my throwout bearing is garbage, i have a leak somewhere in my clutch hydrolics(sp?), and my shift rails are very worn/loose. My mechanic friend said the tob wasnt going to hurt anything more than it already has, so just ignore the noise.. The leak we have been searching for, but havent yet found.. The system was bleeded about 2 weeks ago, but i think i may have a leak such that air is being sucked in. This friend also mentioned that my shifter is horribly sloppy, and he described to me some type of rails that the shifter pulls/pushes to move the tranny forks. Now, i dont understand that last part, but can anyone confirm it? Thanks!


~Jesse

skibum9199

and tranny oil change is my next project... hopefully in the next week-2 weeks. What kind of oil do ya'll recomend? Redline? Royal purple? Mobil? Amsol?


:o Jesse

snoopster76

If I'm wrong, somebody can correct me, their should be three rails in the tranny. The first on works first and second gears, the second one works the third and fourth gears and the last works the fifth and reverse gears. When you push the stick left and forward the fork on the first rail slides a gear into place between the front of the tranny and the tail shaft gears, so on and so forth for the rest of the gears except reverse, where there is an extra gear to reverse the tail shaft, which in turn reverses the rear end. If it grinds in one gear, it should be a sycro, is it extra hard to get into second down shifting? I had a problem get a vehicle into second and first once, then it wouldn't go at all, just third, fourth and revese. Then the only reverse. The drift pin that hold the fork to the rod sheared and when I was trying to get it into first, the fork jammed into the second rod, not allowing me to get it into third or fourth. Just a LONG thought. Good Luck!!!

skibum9199

Actually, yeah, downshifting into 2nd can be hard most of the time... I have to rev it a little to get it to go. On a side note, my car wont go into 1st unless im doing less than like 3 mph... any connection here?


~Jesse

snoopster76

Most first gears aren't syncred so can't put it in doing like twenty five and rip yourself in half with the seat belt, much like 4wd truck won't let you put it in four low without stopping. If you rev it to put it into gear on downshifting then I would say it is syncro. By reveing you are trying to find that happy rpm where the gears mesh together.

Thaniel

Your syncros are worn.

I had the same problem with the down shifting. Rebult my trans and no more problem.

skibum9199

Thats what I was afraid of... how much did your rebuild run you, and is this something that me and my retired mechanic friend could undertake?

~Jesse

relvinnian

Rebuilding a transmission is nuts! There are so many different gears, bearing, seals, blah blah, and most of them look exactly the same. If you plan on rebuilding make sure you have bags and labels for everything. Make sure you have a good idea of the layout of the transmission, and good schematic to work from. I can't wait to rebuild mine this winter

-Brian

Thaniel

If you are good with wrenches then rebuilding will be no problem. There are lots of parts but they are basically the same ones over and over (one set for each gear). The parts didn't cost me much 2 or 3 hundred.

Obviously make sure to note how everything comes apart. I wrote on the gears with marker. Worked good. Also be very careful prying the staked portion of the lock nuts on the shafts. Be sure to lock the trans in reverse and 1st when removing them. Carefully make all measurements and make sure all syncro surfaces mate well and seal surfaces are smooth (lots of time with emery paper).

It is actually pretty neat.

Spawn

It's probably the second gear syncro. A tranny rebuild. It shouldn't cost a whole lot to get it rebuilt if that is the problem. I would drain the tranny fluid and refill it. You never know it could be somethin simple.

Mykl

I shift into first at 25+ all the time, I don't know what ya'll's problem is. Actually, I double clutch on downshifts so I can do that without destroying anything.

My second gear synro is shot too, but it isn't from hard downshifts, it's from constant runs to redline in first gear and fast upshifting without double clutching. Now when I shift from first to second at redline I have to double clutch or shift real slow so the gears speed up enough to mesh the cogs.

Time for a rebuild.

skibum9199

I guess i'll just be double clutching for a while then... and change the tranny fluid. Other than that, looks like no drag racing for a while...


~Jesse