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Old Jan 1st, 20, 02:01 AM   #1 (permalink)
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Unhappy Camaro Vibration ??

Having some Vibration in my 70 Camaro 383 stroker/3550 Tremec 5sp. which starts around 3000RPM .. then goes away when I reach 4000RPM...?? (strange) its just annoying, when I give it throttle, otherwise car goes great when I'm cruising..

Ive been reading lots of opinions, but not with my problem..??

any ideas folks..?

Thanks in advance..
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Old Jan 1st, 20, 03:43 AM   #2 (permalink)
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Re: Camaro Vibration ??

where does it seem to be? front, rear seat of your pants
it could be ANYTHING from a bad wheel bearing to a u joint
need more info
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Old Jan 1st, 20, 07:46 AM   #3 (permalink)
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Re: Camaro Vibration ??

3 to 4K in any gear or only in top gear? If in top gear, recreate the problem and quickly shift into neutral and see if it goes away when the rpmís drop. If so, the issue is with the engine. If not, itís with the trans or driveshaft, most probably the driveshaft.


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Old Jan 1st, 20, 10:20 PM   #4 (permalink)
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Re: Camaro Vibration ??

I will update soon with more info.... I looked under car and noticed DS had a sticker from 'Keisler engineering' Dynamic Balancing Certified..(Knoxfield TN) so I presume it is Balanced correctly.. do you think.?


Thanks for the replies guys.. cheers.
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Old Jan 2nd, 20, 05:23 AM   #5 (permalink)
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Re: Camaro Vibration ??

Is the car lowered? If it is I would suspect driveline angles. Tremec has an app for checking them if I remember right.

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Old Jan 2nd, 20, 11:58 AM   #6 (permalink)
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Re: Camaro Vibration ??

Here's a good info on drive line vibrations. Be sure to read the end
statement titled "Checking to see if you have got it correct".
https://www.hotrodhotline.com/md/htm..._harmonics.php
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Old Jan 2nd, 20, 02:32 PM   #7 (permalink)
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Re: Camaro Vibration ??

Neat article Al. I never heard about preload before.
I did see a car, with the same symptoms I think, that was claimed to have a driveshaft that was slightly too long. It got weird under acceleration. He took a cut off wheel to the slip yoke. not exactly my kind of fix.
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Old Jan 2nd, 20, 03:15 PM   #8 (permalink)
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Re: Camaro Vibration ??

Eliminate the obvious things first. Check your tires and make sure they are balanced. Then check u-joints. I suspect a U-joint or drive shaft as others have stated... and just because the driveline was certified as balanced doesn't mean it didn't throw a balancing weight since then.
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Old Jan 2nd, 20, 08:50 PM   #9 (permalink)
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Re: Camaro Vibration ??

Thanks for all the tech tips, I will keep up with developments and forward the results..


Camaro was originally lowered front and rear with 2" Hotchkis front springs and rear leaves were sagging.. I had to raise front with stock springs for Roadworthy(here) and raised rear with air shocks,,plus 2 new rear BFG tires .. car still looks level just higher..


This is all Ive done, but not sure if vibration was there originally..?? I had car imported fro USA.
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Old Jan 3rd, 20, 06:00 AM   #10 (permalink)
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Re: Camaro Vibration ??

While you're checking the simple stuff, make sure the u-bolt straps holding the u-joint caps to the pinion flanges aren't torqued too tight as this can cause the u-joint to bind. Should be torqued to about 17 lb-ft I think. Easiest way to do this is to tighten the nuts on the u-bolts until the lock washer just compresses and add 1/8 turn more.
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Old Jan 3rd, 20, 06:45 AM   #11 (permalink)
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Re: Camaro Vibration ??

If you raised the rear end two inches with air shocks you significantly changed your driveline angles. Time for some driveline angle measuring imho...

Don
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Old Jan 3rd, 20, 05:07 PM   #12 (permalink)
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Re: Camaro Vibration ??

Ive checked drive line angles.. with tremec app..car level.. from front crank pulley/DS/bottom horizontal diff yoke. All passed with 'Driveline Operating angle' reading 00.2
A bit more testing coming up..

will update more soon..
Cheers all.
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Old Jan 6th, 20, 01:36 AM   #13 (permalink)
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Re: Camaro Vibration ??

Just an update... weather has been bad haven't got car out yet, but did some checking underneath, checked D/S run-out but only diff end 0.010. And center 0.025.
Also noticed at Tranny, shaft uni had about 1+ inch clearance on passenger side hump, and heaps on Drivers side..? so I measured engine and found it a bit on an angle, like its twisted a bit..? is this normal.? or cause any issues with drive line vibration..?? Seems if engine/tranny mounts are all standard bolt up, this must be normal..? Can somebody check their own Camaro if they have a Tremec 5sp..?
Hope to get car out soon.
cheers talk soon.
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Old Jan 7th, 20, 12:06 AM   #14 (permalink)
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Re: Camaro Vibration ??

got car out today, after a plug lead repair.
I might still get tail-shaft checked to be safe... But I put the boot into it again, and really
any vibration that came up was minimal and doesnt last long, so it mught be just the engine power coming up... then smoothing out.. doesnt seem to vibrate in idle up to 4000rpm.

cheers all you guys. thanks for all the input, I will remember it all.
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