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Discussion Starter · #1 ·
Need some opinions here, and ideas if you have some.

Under VERY LIGHT throttle conditions, and just above 2000 rpm's, I have a loud rumble that I can feel through the pedals, shifter and seat. If I goose the throttle, it goes away until it drops back down to 2000rpms.

The trans was rebuilt last summer buy a local Vette/Chevy mechanic (or someone in his shop) and I also have a Yank 3500 stall converter.

I've noticed it in the past/last year with the A/C on. Within the last 2-3 weeks, it's become common place.

Checked the fluid level, when hot and on a level surf, looks fine and is just above half way in the area marked "hot". Fluid looks clean and doesn't smell burnt.

Any ideas, tips, tricks, things to look for?
 

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Discussion Starter · #6 ·
I'll have to check the motor and transmission mounts, thanks for the suggestion.

Jason Smith did the rebuild for me, but I'm not 100% sure if he did it for himself. He also did the 700R4 in my Jeep and that baby is nice and tight still.

I'm worried it maybe the torque converter.

Does anyone know how to tell if a TC is going bad?

The 6 speed swap may become a reality if the tranny shits the bed on me. Time to start saving.
 

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Discussion Starter · #7 ·
Jeff, it shifts fine. I'm starting to think something in my exhaust system has come loose or is loosening up. I'm hearing a metalic jingle from the back.

I'm wondering if the spring/hangers are loose.
 

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Discussion Starter · #9 ·
Update... I have a little more info that I noticed today. If I have the heat on, which I believe activates the a/c compressor, I get the vibration.

If the climate control is turned off, no vibes at all. My a/c works fine as does the heat so, I don't think the compressor is bad but who knows.

So, my question now is why does the load of the a/c compressor (if it's engaged when the heats on) cause a vibration just above 2000 rpms under no or light throttle conditions? I've even experienced it under deceleration.

I'm all ears if anyone has some ideas.
 

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Discussion Starter · #11 ·
HMMMMMM... you got me thinking now.

I have headers and all the brackets are still there, except for one. I left off the small support rod that goes behind the alternator.

I'm going to experiment this week and see if I can get the vibration to show up with the Vette in park. I may need the motor under a load for the vibe to show up, but I could get lucky.

Thanks Jeff, you have given me something to look into. I may get lucky and the support rod I left off could be the problem. :excited:
 

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Discussion Starter · #13 ·
VetteTech81 said:
Man.. this is a hard one to diagnoses from a desk.. LoL.. There are a lot of things that could probably cause this problem... Here is another question when did this vibration start happening.. right after the header install or soon after? otherwise I am thinking the missing brace might not be ther problem..

-Rick
The headers, trans and torque converter all went in at the same time. After everything was done, I would get the vibration, but only when the A/C was on.

About 2 weeks after I did all that work, the Vette went into the bodyshop for the rest of the summer.

Now, the vibrations became noticeable all the time in the last few months.

I'm going to look into the bracket because it could be a problem along with the only lead I have right now. I'm also going to check all the accesory brackets incase something is coming loose. But, if you have any ideas, I'm listening.
 

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Discussion Starter · #18 ·
MVR 155 said:
Tim,
When I put the longtubes on my vette I had to fabricate a spacer to get my AC brackets to work, while I had one of the brackets off I would also get some vibration when the AC was on, without the bracket(s) in place I would be certain this is the culprit to your problem as you described it.

Good Luck

Mike
Thanks Mike!:thumbsup:
 
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