Shift grinding

[marteeni]

I have a 2K convertible with 6spd and would like to know if there is an adjustment for the clutch? When I shift from 2nd to 3rd, 4th to 6th, or 5th to 6th, I get a grinding noise. It started with just the 4th to 6th shift, but now it is doing on the above shifts as well. Ideas anyone??

 

[c4c5specialist]

Hi there,
There is a shifter adjustment.
There is no clutch adjustment needed, as this is NOT happening in every gear.
A sidebar is have you ever changed the fluid in your transmission????
Allthebest, c4c5

 

[Patrick]

Paul, at what interval should you change the transmission fluid on a manual?

-Patrick

 

[c4c5specialist]

HI there,
It really depends on how you drive.
Drivers who are not really hard drivers may not need to change it at all.
Otherwise, I usually suggest every 3 years/30k if you like to drive hard.
Allthebest, c4c5

 

[Patrick]

Thanks for that bit of advice, Paul. I was initially surprized when I read your response recommending a change of the manual transmission fluid because the owners manual (and yes, I actually read it :L) did not recommend changing the fluid in an M6 at all.

While I don't drive my Z06 "hard" on a regular basis, I do enjoy the occasional "blow the carbon out" run. I also have no idea how the previous owner ran it for the year he had it. So to be on the safe side, I think I'll plan on a fluid change next spring/summer. That'll be about when I hit the 30,000 mark.


-Patrick

 

[marteeni]

I have been reading some other posts and it seems that replacing the trans fluid with Redline ATF takes care of this gear grinding problem. I've also read about some issues with the shift fork being aluminum and bending. My Vette has about 43000 miles on it so it probably is time to replace the oil. Also, yes it only grinds when going into 3rd and 6th.

 

[jcs712]

I have been reading some other posts and it seems that replacing the trans fluid with Redline ATF takes care of this gear grinding problem. I've also read about some issues with the shift fork being aluminum and bending. My Vette has about 43000 miles on it so it probably is time to replace the oil. Also, yes it only grinds when going into 3rd and 6th.

I agree and recommend you change the fluid and go with a high quality synthetic. I just put the Red Line D4 trans fluid into mine. I have low mileage on my car but wanted to put the syn in to avoid any problems down the road. I understand the synthetic has some properties to better prevent synchro wear and in some cases help in situations where synchro wear has already occured. I am sure C4C5 has something else to say on this subject.

Some other possibilities you may want to check into are Mobil 1 synthetic trans fluid and BG Synchro Shift fluid. I have heard these do a great job as well. Make sure you get a fluid that meets the specifications called for by GM. Good Luck.

 

[SleepieAce]

How much fluid is required when you change it? This is the first I'd heard of a need for it in a manual transmission, but I'm sure mine needs it. I'm not the easiest driver. Also, are these fluids you mention available at parts stores?

 

[jcs712]

How much fluid is required when you change it? This is the first I'd heard of a need for it in a manual transmission, but I'm sure mine needs it. I'm not the easiest driver. Also, are these fluids you mention available at parts stores?

Sleepie - You will need some clarification on this but I recall purchasing 4 containers of the Red Line D4 Trans Fluid from West Coast Corvettes. I read a post in the Archives about this product on the Corvette Forum. I cannot recall if the containers were quarts or pints. Check your owners manual.

For the BG product, you can only get it through professional shops. Go to www.bgfindashop.com to find a retailer in your area.

You may be able to find the Mobil 1 synthetic trans product at most local parts stores.

Do not be alarmed at the price of this stuff. It is not cheap. I think I paid about $7.45 per quart for the Red Line product.

 

[DDLS3]

SleepieAce

According to the GM service manual your 99 6-speed would require 4.1 quarts of Dextron III automatic transmission fluid.

 

[Patrick]

SleepieAce

According to the GM service manual your 99 6-speed would require 4.1 quarts of Dextron III automatic transmission fluid.

DDLS1,
Is this the same amount of transmission fluid required for a manual transmission? Sleepie Ace, like myself, has an M6 transmission. According to the owner's manual, under "normal" driving (emphasis on "normal"), there is no reason to change the transmission fluid on a manual at all.

What C4C5Specialist indicated is that if you have a manual, and your driving habits are anything other than "normal," you will need to change the fluid at 30,000 or so miles. What I need to find out is if the volume of transmission fluid is the same for a manual as an automatic.


-Patrick

 

[SleepieAce]

Thanks for the info so far. 4 quarts seems about right. When I was last under there I noticed the tranny didn't have a real big housing.

 

[c4c5specialist]

HI there,
No, the automatic can take up to 4 quarts if your only dropping the pan.
If you intend on flushing the entire transmission, then you may use as many as 14.
As for the Redline D4ATF, there are a few reasons why this may help the shifting condition in an manual transmission.
First, it will help the wear because it is synthetic.
Second, the frictional modifiers will also help slow the syncronizers down at a faster rate, to assist in shifting.
Allthebest, c4c5

 

[DDLS3]

As for the Redline D4ATF, there are a few reasons why this may help the shifting condition in an manual transmission.
First, it will help the wear because it is synthetic.
Second, the frictional modifiers will also help slow the syncronizers down at a faster rate, to assist in shifting.
Allthebest, c4c5

So what fluid would you reccomend? My 99 FRC has 42k on it. The tranny shifts fine. It just seems after 5 years of operation that it would be money well spent changing the transmission fluid. I really don't want to affect the way it shifts or have a seal start leaking. Dextron III or Redine D4ATF?

 

[SleepieAce]

So the manual tranny will take about 14 quarts on a complete flush?

 

[marteeni]

The manual tranny takes 4.5 quarts, period.

 

[DRTH VTR]

HI there,
No, the automatic can take up to 4 quarts if your only dropping the pan.
If you intend on flushing the entire transmission, then you may use as many as 14.Allthebest, c4c5

We seem to be talking about 2 things here: 4 quarts for the manual, more for the automatic

 

[Patrick]

I'd say, we're talking about four things: Quantity of transmission fluid for a drain and refill (Automatic and Manual) vs. quantity of transmission fluid for a complete flush of the system (Automatic and Manual.)


-Patrick

 

[c4c5specialist]

HI there,
First, automatics take the 14 quarts on a flush, not the manual, sorry about that.
Second, if you are having no problems, simply install fresh Dexron 3.
Allthebest, c4c5