(ZF6) Non-Smooth Shifting...
Thread Starter
Team Owner
Joined: Aug 2000
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(ZF6) Non-Smooth Shifting...
My car isn't shifting too smooth. Its not a problem, I can get it into gear, but sometimes it won't let me go into first gear from a stop.
And while shifting it isn't as smooth as other cars i have driven.
Is this just the ZF6 or what? Is a tranny fluid change in order?
And while shifting it isn't as smooth as other cars i have driven.
Is this just the ZF6 or what? Is a tranny fluid change in order?
Race Director
Joined: Apr 2000
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From: Texas
Re: (ZF6) Non-Smooth Shifting... (Marty McFly)
Relative to not going into 1st...There's actually a blurb in the owner's manual about this, so what you're experiencing is probably normal. The ZF6 isn't exactly the smoothest in the world.
If it hasn't been done in the last year, I'd bleed the clutch fluid. It's basically brake fluid and changing it periodically doesn't hurt.
If it hasn't been done in the last year, I'd bleed the clutch fluid. It's basically brake fluid and changing it periodically doesn't hurt.
Safety Car
Joined: Aug 2002
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From: SANTA CRUZ CA
Re: (ZF6) Non-Smooth Shifting... (96GS#007)
Relative to not going into 1st...There's actually a blurb in the owner's manual about this...
Citing the blurb: "If you've come to a complete stop and it's hard to shift into 1, put the shift lever in N and let up on the clutch. Press the clutch pedal back down. Then shift in 1.
Safety Car
Joined: Aug 2002
Posts: 3,842
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From: SANTA CRUZ CA
Re: (ZF6) Non-Smooth Shifting... (Marty McFly)
Wonder why the Zf6 is like that?
Race Director
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From: Lake Wylie SC
Re: (ZF6) Non-Smooth Shifting... (92corvette)
WHat fixed mine was a fluid change using the correct GM part number fluid.
Made on heck of a difference.
Made on heck of a difference.
Thread Starter
Team Owner
Joined: Aug 2000
Posts: 28,015
Likes: 32
Re: (ZF6) Non-Smooth Shifting... (92corvette)
WHat fixed mine was a fluid change using the correct GM part number fluid.
Made on heck of a difference.
Made on heck of a difference.
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Burning Brakes
Joined: Nov 2000
Posts: 1,117
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From: DFW TX
Re: (ZF6) Non-Smooth Shifting... (Marty McFly)
I never go to the dealer. My local qwuick lube place did it for somewhere around $40. The lube is pretty expensive just to buy it, so it was a pretty good deal not to have to get under it myself.
JUST MAKE SURE THEY KNOW THE CORRECT FLUID.....
[Modified by 92corvette, 10:23 PM 5/4/2003]
[Modified by 92corvette, 10:25 PM 5/4/2003]
JUST MAKE SURE THEY KNOW THE CORRECT FLUID.....
[Modified by 92corvette, 10:23 PM 5/4/2003]
[Modified by 92corvette, 10:25 PM 5/4/2003]
Melting Slicks
Joined: Aug 2000
Posts: 2,618
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From: Overland Park KS
Re: (ZF6) Non-Smooth Shifting... (92corvette)
You're playing with fire!!!
Synchros for ZF $680
Labor for swapping them out $400
Shipping transmission to Standardtransmission.com $300
Finding out the tranny is probably okay and it's the hydralic clutch system which may only cost about $400 with labor (priceless).
Read my posts on my tranny and check your hydralic clutch system as you could have problems with your master or slave cylinder. Also, change your fluid in the tranny each year for cheap insurance...
Synchros for ZF $680
Labor for swapping them out $400
Shipping transmission to Standardtransmission.com $300
Finding out the tranny is probably okay and it's the hydralic clutch system which may only cost about $400 with labor (priceless).
Read my posts on my tranny and check your hydralic clutch system as you could have problems with your master or slave cylinder. Also, change your fluid in the tranny each year for cheap insurance...
Pro
Joined: Feb 2003
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From: anderson sc
Re: (ZF6) Non-Smooth Shifting... (KCvetteowner)
i heard that changing the fluid would make a good difference. how can i do it myself. draining is no prob, but how to get the fluid in teh gear box? can someone please describe in detail how this is done? i'd appreciate it alot. i know that those big ole gm oil bottles aint fittin up there. lol
Burning Brakes
Joined: Nov 2000
Posts: 1,117
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From: DFW TX
Re: (ZF6) Non-Smooth Shifting... (Clemson Vette)
For changing those types of fluids, I use a pump that screws onto the top of any oil/fluid type container. I got it from the 'boat' department of a walmart type store. It is made to put lower gear drive fluid in boats.
Team Owner
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From: OBAMA IS HITLER
Re: (ZF6) Non-Smooth Shifting... (Marty McFly)
Have your master & slave cylinders checked, it is very likely one (or possibly both) have a leak. If thats the case, replace both. Total cost $350 - 400 includes labor. I'm betting on one of the cylinders having a leak :yesnod:
Melting Slicks
Joined: Apr 2003
Posts: 2,150
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From: NS
Re: (ZF6) Non-Smooth Shifting... (96GS#007)
Relative to not going into 1st...There's actually a blurb in the owner's manual about this, so what you're experiencing is probably normal. The ZF6 isn't exactly the smoothest in the world.
My ZF6 shift smooth in all gears.
From the problem description it sure sounds like a hydraulic clutch problem. The clutch is not completely disengaging. Very harmful to the ZF6! I think I would first flush and change the fluid in the clutch system, making sure it's bled properly. If that doesn't fix it then it may be time to change the master/slave cylinder.
To test the hydraulic clutch system, from GM service manual: Run the engine, clutch pedal depressed, shift between 1st and reverse a few times. It should shift smoothly each time with little resistance.
Race Director
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From: Texas
Re: (ZF6) Non-Smooth Shifting... (Atok)
Relative to not going into 1st...There's actually a blurb in the owner's manual about this, so what you're experiencing is probably normal. The ZF6 isn't exactly the smoothest in the world.
I don't see this in my owner's manual, or my service manual?
I don't see this in my owner's manual, or my service manual?
The first time I read it was when I bought my 1990 L98 (sold). Since it was in the '90 Owner's Manual and it's in the '96 Owner's Manual, it's reasonable to expect it to be in the '91 through '95 manuals as well.
Safety Car
Joined: Oct 2002
Posts: 4,277
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From: Austin Texas
2018 C6 of Year Finalist
Re: (ZF6) Non-Smooth Shifting... (96GS#007)
My 96 has the same problem. Slave cylender was replaced about 1000 miles ago. What shoul I check? I have never had a problem getting it in gear.It is just not as smooth as my friends 2000 Vert.
