1995 ZR1 Transmission Really Stiff...Sometimes

[RichieDMD]

I have had my ZR1 for about a year now and I drive it occasionally. I have noticed that some days the transmission is super stiff. It seems to be more in the morning when I'm leaving the house and on my way to work so I just chalked it up to being cold. I don't live far from work so I don't think it even fully warms up in the morning.

But some days it's worse than others. Planning on driving the car this week I have left it out over night. Yesterday I drove it and it was a little hard shifting in the morning (I find that on the way to work I often get a little grind noise going into 3rd). But this morning it was even worse. It was so stiff I couldn't even get it into reverse to back it out of the driveway. Using both hands I couldn't seem to get it in gear. After a minute or two of struggling with it I put it back into first and shut it off...I drove my 2002 Camaro to work instead. It was a little hard to get it back into first but not bad.

I understand that high performance cars from this era tend to have challenging transmissions when cold...but it seems some days this is more than that. Any thoughts?

Car has 38K miles on it.

Thanks.

[DRM500RUBYZR-1]

Something is amiss.
It should not be anywhere near as difficult as oyu have described.

Two suggestions.

First take it to a shop that will drain and refill the transmission with the correct lubricant. Mobil 1 or Amsoil are considered to be ideal for the ZF trans.

Second, make sure that your clutch fluid is both clean and more importantly full.

Once both of those have been done, if your effort is not greatly reduced then the transmission may have a mechanical issue.

That eliminates the simple easily correctable causes.
Good luck and keep us posted of your progress.
:cheers:
Marty

[WARP TEN]

I have had my ZR1 for about a year now and I drive it occasionally. I have noticed that some days the transmission is super stiff. It seems to be more in the morning when I'm leaving the house and on my way to work so I just chalked it up to being cold. I don't live far from work so I don't think it even fully warms up in the morning.....

Boy that sounds a lot like me when I get up in the morning! --Bob

[RichieDMD]

Something is amiss.
It should not be anywhere near as difficult as oyu have described.

Two suggestions.

First take it to a shop that will drain and refill the transmission with the correct lubricant. Mobil 1 or Amsoil are considered to be ideal for the ZF trans.

Second, make sure that your clutch fluid is both clean and more importantly full.

Once both of those have been done, if your effort is not greatly reduced then the transmission may have a mechanical issue.

That eliminates the simple easily correctable causes.
Good luck and keep us posted of your progress.
:cheers:
Marty
The fluid recommendations here call for a Castrol 10/60. Before I call around I want to make sure I'm verifying the proper oil. What should I tell them?

https://www.zr1netregistry.com/Information/TechNet/FluidRecommendations.aspx

[DRM500RUBYZR-1]

The Castrol is fine as well!
:cheers:
Marty

[viper107]

car should shift like butter,do not force the shifter! its either got a tired clutch or a internal worn part or parts if the fluid change doesnt fix it

[lfalzarano]

Check your clutch fluid level under the ECM. If the transmission fluid hasn?t been changed, get it done.


Sent from my iPhone using ZR-1 Net Registry (http://r.tapatalk.com/byo?rid=90383)

[RichieDMD]

Thanks for the advice everyone. I will get the fluid done ASAP.

[RichieDMD]

So I called around to a few shops today to find a place to go (everyone is super busy right now). One of the people I spoke with asked me if I had a hard time putting it in reverse when the car was shut off. I admitted I hadn't tried.

When I got home today I decided to move cars around and put the ZR-1 back in the garage for now as I won't be driving it the rest of the week. Before starting it, I tried to put it into reverse and it was easy. I then moved it back to first gear, started the car, and tried to go into reverse. I was able to get it into gear but it was much more difficult.

The person I spoke with must have had a reason for asking me this...but I'm not overly knowledgeable with transmissions. What would this indicate (if anything)?

[secondchance]

So I called around to a few shops today to find a place to go (everyone is super busy right now). One of the people I spoke with asked me if I had a hard time putting it in reverse when the car was shut off. I admitted I hadn't tried.

When I got home today I decided to move cars around and put the ZR-1 back in the garage for now as I won't be driving it the rest of the week. Before starting it, I tried to put it into reverse and it was easy. I then moved it back to first gear, started the car, and tried to go into reverse. I was able to get it into gear but it was much more difficult.

The person I spoke with must have had a reason for asking me this...but I'm not overly knowledgeable with transmissions. What would this indicate (if anything)?

Possibly, clutch not disengaging completely.

[DRM500RUBYZR-1]

Something is amiss.
It should not be anywhere near as difficult as oyu have described.

Two suggestions.

First take it to a shop that will drain and refill the transmission with the correct lubricant. Mobil 1 or Amsoil are considered to be ideal for the ZF trans.

Second, make sure that your clutch fluid is both clean and more importantly full.

Once both of those have been done, if your effort is not greatly reduced then the transmission may have a mechanical issue.

That eliminates the simple easily correctable causes.
Good luck and keep us posted of your progress.
:cheers:
Marty

Check that clutch fluid level.
:cheers:
Marty

[Young1]

Flush out that forgotten black nasty clutch fluid. Drain and fill trans with this. 18392
Mine noticibly shifted smoother after removing factory fill at 38k miles.

[Dynomite]

Just for information.......I had a 91' Black Label Rebuilt by ZFdoc for my 95'.
He added a short shifter :thumbsup::thumbsup:

It now shifts almost like an automatic :cheers::handshak:

That is not a good comparison but you know what I mean :):dancing

https://cimg7.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x600-1/80-353a8770_2463_4a3d_bd53_860920b2b618_1__215baaf45f a8310b57b69078bd80040f5003d62d.jpg