My car runs exellent except for the fact that when I power shift or shift fast at high RPM, the gears are notchy and wont shift properly.
I cannot afford or even have time for a transmission rebuild right now, but as far as I know the transmission fluid has never been changed.
The car was never raced or seriously abused when I bought it with the first owner being a woman =) and the second owner being a guy who hardly ever drove the car.
The car shifts very well if I drive normal, but is notchy when I power shift.
Anyway with this being said, will flushing my transmission fluid help the rough shifting? I know it wont "magically" cure my problem but, is it gonna help?
Ernesto

 

It certainly can't hurt to change the fluid! My tranny got significantly smoother when I changed mine... I used Neo Oil 75W90 HD in both the tranny and diff.

http://www.neosyntheticoil.com/gear_oil.html

You might as well get a gallon and do both the tranny and diff together.... as a gallon is the perfect volume.

 

if you cant afford to buy a tranny....you should probably stop abusing the one you have now. it will get worse.


....its always good to change the fluid....but i wouldnt count on it solving your issue....what clutch do you have?

 

+1, power shifting is extremely hard on the tranny and you shouldn't be doing it unless you're prepared to have it break at any given moment.

 

Well if it has problems now they can only continue to get worse. You can try changing the fluid, but in all I would start saving.

 

I do not abuse my transmission in case your wondering. I just like to bring the rpms up to about 4k when I shift or 4500k, but I certainly do not race all over the city. It feels notchy when I shift normal sometimes into 3rd gear, and 4th gear.
I have a stock clutch and it was replaced just before I bought the car. It really sucks that I cant shift at high rpm 6000, but for now all I want is for it to shift smooth if I drive normal/spirited city driving, not racing.

 

Is anyone else here confused??......POWER SHIFTING is ABUSE.

 

Ha, was wondering the same thing myself...

 

ok ok thats my fault, im NOT power shifting. Or maby I dont know what it means. All im doig is trying to shift at high rpm and the car will NOT do it period so I do not force it

 

if power shifting means that im not using the clutch to shift then I messed up, cause I AM usng the clutch. Maby this is a lil more clear?

 

I figured that is what you meant. Taking it up to redline in one gear and shifting fast into the next gear, using the clutch properly.

Just spend ~40-50 bucks and change the fluid, it can't really hurt.

 

alright im gonna do it! When I do decide to flush it, I will let everyone know the results. Thanks for the help

 

.....OK...lol...no problem...

....it is natural for a transmission to get increasingly dificult to shift as you rev higher....the synchronizers are what allow the tranny to even shift without gears being matched ....so i would say if the tranny is REALLY getting bad that would be the culprit....


-Jack

 

When shifting at high rpms it is normal to feel a little more resistance. But it should only mean that you can't shift as fast - just push gently into the gear and if the synchronizers are functioning properly it will go in without much force. It will just take a moment. More accurate rev matching definitely helps.

If your synchros aren't getting much bite, I suggest draining the gear oil and replacing with a GL-4 oil like Redline MT-90 or Amsoil MTG. Most gear oils are GL-5 nowadays, and most GL-5s make the synchros perform less efficiently. In fact some GL-5s will attack the synchros as cause more rapid wear. The right GL-4 should help the synchros get more bite.

If the gear oil doesn't help and you're shifting as you should, then you need to get the tranny looked at. Might need a rebuild.

Dave

 

I think that it's possible that the clutch is not releasing all the way. This makes the tranny work harder to match revs up on the gears, particularly at higher RPM.

I would start by replacing the trans fluid (it's good to do it anyhow!).

If that doesn't fix it, I would try to verify that the clutch is releasing fully. Keep in mind - it was just replaced, right? I wonder if it was not properly adjusted. If you stop the car and then slowly put it into first gear while holding the clutch down, does the car creep forwards?

Brian

 

Brian, you're right. This poster is the one who is decribing clutch hydraulic trouble in another thread. These are probably one and the same issue.

Dave

 

i am currently not driving the car, because the clutch pedal is going to the floor. It started sinking to the floor after I replaced the leaky clutch master cylinder( and bled the system of course)Im thinking the new master cylinder may have been a "shock" to the hydraulic system, and put a lot of stress on my slave cylinder, which MAY have cause it to go bad.When the system is bled, the pedal feels firm for a little while (10-15min) then sinks again to the floor

This may also be why the transmission is shifting rough.

 

A bad clutch system will absolutely cause rough shifts. Or prevent them entirely.