Low whining sound from undercarriage

[oldpro]

Pilot. Bushing mine did the same thing

[Ccmano]

Take it to Crossed Flags Performance in Magnolia if your close enough. There are not many good ZR-1 shops around, he’s the closest to you.

https://www.crossedflagsllc.com/

Steve Schroeder knows what he’s doing on these cars. I agree with the pilot bushing theory based on what I’ve read.
H

[ZR11974]

Old pro and ccmano, thank you for taking the time to respond. It's so great to have a forum like this available to a newbie, like me.
And, magnolia is only a few hours away. Next door, by texas standards.
I will definitely look them up!
Thanks again and take care out there!

[Dynomite]

Originally Posted by ZR11974

That last question was a dumb one. Let me go with, is it as involved as I imagine to repair?

The Pilot and Engine both rotate at same speed whenever Flywheel is Engaged with Transmission. It is only when depressing Clutch Pedal and shifting that the Pilot Bearing is spinning within the Flywheel/Crankshaft.

Some links related to the Pilot Bushing and repair.

TRANSMISSION
Post 35 - Pilot Bearing
Post 36 - ZR-1 Transmission Install and Lift Tricks
Post 37 - Vibration Issues Diagnosis
Post 38 - Throwout Bearings and Clutch Forks
Post 39 - C4 Beam Plates and Installation

[TX '90 ZR1]

I believe everyone is on the right diagnosis track.
There is also Corey Henderson in New Braunfels (Henderson Performance) that is well versed in the ZR-1/LT5.
That being said, Steve @ Crossed Flags is very highly regarded also.
Good Luck and hope to see you next year @ the BBQ??

[ZR11974]

Kenny,
Thanks for the input. I've already had the car to see Corey, but of course it wasn't making this sound when he did the initial once over for me. Corey is great, and I'll be reaching out to him first to get his thoughts. Really helpful, genuine guy.
I would love to come out to the bbq! Where it's the best place to get info about it?
Thanks again and take care.

Geoff
'90 #2591

[ZR11974]

Originally Posted by Dynomite

The Pilot and Engine both rotate at same speed whenever Flywheel is Engaged with Transmission. It is only when depressing Clutch Pedal and shifting that the Pilot Bearing is spinning within the Flywheel/Crankshaft.

Some links related to the Pilot Bushing and repair.

TRANSMISSION
Post 35 - Pilot Bearing
Post 36 - ZR-1 Transmission Install and Lift Tricks
Post 37 - Vibration Issues Diagnosis
Post 38 - Throwout Bearings and Clutch Forks
Post 39 - C4 Beam Plates and Installation

Dynomite,
Thanks so much for helping me start my research. I love learning more about these cars!
I appreciate your efforts, my friend.

Geoff
'90 #2591

[XfireZ51]

Originally Posted by ZR11974

DRMRUBY500ZR-1,

I think we may have a winner...it's loud enough to scare the dead. And, loud enough I always try to make it stop, because it makes my beauty sound like a beater!
Definitely comes and goes.
And, it could be described as a howling...not to be confused with the werewolves. This is louder. Haha.
I'm definitely going to do some researching as I think you've nailed it.
Did you do the job yourself, or have someone do it.
The ZF has to come out to get to it, correct?

I think its fun at times when u pull up to some late model “fast car”, and there u are with the motor rumbling and the ZF w SM flywheel is making noise like all ur rod bearings are failing.
And then the light turns green. 🤣🤣🤣

[TX '90 ZR1]

Geoff,
The BBQ is normally in the spring. Have not seen any details about next year's yet, but the info will be posted here on the forum when they set it up.
I went this past spring and saw a bunch of neat cars and met a bunch of really nice people!
My understanding it is always at Joe Cagianut's place in Cibolo. Not far at all for you.

[dredgeguy]

Originally Posted by XfireZ51

I think its fun at times when u pull up to some late model “fast car”, and there u are with the motor rumbling and the ZF w SM flywheel is making noise like all ur rod bearings are failing.
And then the light turns green. 🤣🤣🤣

You just made me burst out laughing...........great one!