1967 Chevelle LS2 swap drivetrain vibration - Chevelle Tech
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post #1 of 10 (permalink) Old Jul 2nd, 19, 3:21 PM Thread Starter
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1967 Chevelle LS2 swap drivetrain vibration

I have a new to me in 1967 Chevelle with a LS2 swap. I bought the car with the swap complete but it currently has a bad driveline vibration. Drivetrain is a new LS2/4l80e crate engine with 110 miles on combination. The swap was done with energy suspension mounts. Am I better to address the engine location, or get adjustable rear control arms and set drive angles? The car is pretty low so guess that has effected drive angles as well?
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post #2 of 10 (permalink) Old Jul 2nd, 19, 3:59 PM
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Re: 1967 Chevelle LS2 swap drivetrain vibration

more details on nature of vibration needed ....
And eliminate motor by bringing rpm up in neutral while still to vibration speed

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post #3 of 10 (permalink) Old Jul 2nd, 19, 4:12 PM
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Re: 1967 Chevelle LS2 swap drivetrain vibration

My original driveshaft that got shortened and rebalanced at 2500 shaft RPM still vibrated obnoxiously. I eventually got an all new driveshaft . . . Problem solved.

Rick

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post #4 of 10 (permalink) Old Jul 2nd, 19, 4:16 PM Thread Starter
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The vibrations definitely not in the motor, it’s definitely in the driveline. No vibration in neutral coasting down road, or upon Increasing rpm in neutral. The swap was done using energy suspension mounts but you can definitely tell if the motor is pitched downwards at trans end.
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post #5 of 10 (permalink) Old Aug 12th, 19, 6:52 PM
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Re: 1967 Chevelle LS2 swap drivetrain vibration

Iím having the same problem with my '66 .. First time on the road last Thursday....
More like a shake than a vibration.... Only does it under acceleration.....
360 hp bbc, Tremec 5 speed and clutch assembly, shortened and balanced drive shaft ....

1966 Black/Red SS coupe .....
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post #6 of 10 (permalink) Old Aug 13th, 19, 12:09 PM
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Re: 1967 Chevelle LS2 swap drivetrain vibration

Get your protractors out and measure the angles. Should have a slight downward rake on engine ( -3) , and slight upward rake on pinion (+3). ES poly mounts dont cause vibrations, incorrect assembly or bad shaft does.

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post #7 of 10 (permalink) Old Aug 13th, 19, 12:24 PM
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Re: 1967 Chevelle LS2 swap drivetrain vibration

You don't even need a protractor...use your smart phone and this HANDY ap...
TREMEC Toolbox App
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post #8 of 10 (permalink) Old Aug 14th, 19, 9:27 AM
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Re: 1967 Chevelle LS2 swap drivetrain vibration

Quote:
Originally Posted by BillsCamino View Post
You don't even need a protractor...use your smart phone and this HANDY ap...
TREMEC Toolbox App
Man, I've tried using that app 100 times, but unfortunately wasn't able to make it work. I've got an android phone with buttons on the side, problem #1, but the bigger problem is the pitch sensor in the phone. You could move the phone slightly and get any angle you wanted. My drivetrain is so jacked up it's comical, yet I could get all greens on the app.

CDN67, I feel you man, been through the same rodeo.

First thing is free. Jack the rear of your car up, put it in drive, then get down and watch your driveshaft. Make sure it's straight, true, and there is NO visible wiggle.

Second is the life sucking chore of measuring your driveline angles and going crazy trying to find 2 or 3 pieces of well meant advice on the net that matches up AND makes sense.

Here's what I did, it worked for me, I have almost 10k miles on my swap and 0 vibration up to 120mph with poly engine, trans, and solid rear bushings.

Purchase this angle finder: https://www.homedepot.com/p/Johnson-...B&gclsrc=aw.ds

What I found to work for our wild angles was measuring engine angle, driveshaft angle, and rear end angle, doing some math, and finding the working angle of everything involved. You're getting ready to hear about u-joint bind, angle velocities, etc etc. Plug your ears.

Use this as your guide: https://www.drivelinesnw.com/part-tr...ngle-problems/

Get your working angles as close to one another / cancelling out as possible, and go for a drive. I used Speedway Motors adjustable uppers on my rear (there are better versions out there) to get my driveline angles set and had to put spacers on the trans mount / trans crossmember.

Good luck!
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*Jeff*

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post #9 of 10 (permalink) Old Aug 14th, 19, 10:01 AM
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Re: 1967 Chevelle LS2 swap drivetrain vibration

App works great for me...iPhone 10...you can use ANY side of your phone.
Just used this last week to set pinion angle on an LS powered, Alston chassis, '56 Nomad.
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post #10 of 10 (permalink) Old Aug 16th, 19, 1:35 AM
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Re: 1967 Chevelle LS2 swap drivetrain vibration

I can feel for you, I had the same thing after a T56 swap. Mine turned out to be 3 problems, the first one was the driveshaft. After the one shop screwing up 2 of them I found a driveshaft from a Roush Cobra of all things that worked perfect and I might beefy unit at that. Got it balanced some place else but there was still some vibration. Second was the stupid Edelbrock performer that was causing a bunch issues (lean spikes) in 6th gear, I replaced it with a Holley HP carb and the car was a ton better. Third I replaced the rear tires and now it all gone car is smooth as glass at 80 mph in 6th. Funny thing was my old 60'd bubble balancer did a better job than the fancy big buck spin balance that the shop used and I watched both get done with 000 on the machine. Make sure your driveshaft angles are right with this as that alone can cause a ton of trouble also.
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