Driveline Vibration

[money pit]

My Barracuda was originally a slant six. I replaced the engine (360), 727 trans, new driveshaft, 8 3/4 rear end and heavy duty leaf springs. I have a vibration above 55 mph. I was wondering if my pinion angle is off. Where is the best place to measure the pinion angle? I watched a number of YouTube videos and they all seem to measure them differently. The vibration seems to be coming from the driveshaft or rear end. Thanks

 

[Challenger RTA]

Took a drive shaft of once and put back on and had a vibration.Did a rocket science move.turned the shaft 180 in the yoke. had no problem after that.Don't know why or how but it worked.

 

[moparlifer]

My Barracuda was originally a slant six. I replaced the engine (360), 727 trans, new driveshaft, 8 3/4 rear end and heavy duty leaf springs. I have a vibration above 55 mph. I was wondering if my pinion angle is off. Where is the best place to measure the pinion angle? I watched a number of YouTube videos and they all seem to measure them differently. The vibration seems to be coming from the driveshaft or rear end. Thanks

i believe the top of the axle where the pinion snubber bolts is horizontally aligned with the input shaft. unbolt the snubber and put the angle-finder on the flat.

 

[Chryco Psycho]

This should help

 

[moparleo]

Moparts on the Web - Main Index

 

[money pit]

This should help

Took a drive shaft of once and put back on and had a vibration.Did a rocket science move.turned the shaft 180 in the yoke. had no problem after that.Don't know why or how but it worked.

I just watched the video Chryco Psycho sent. It explains why turning your driveshaft 180 deg solved your problem. Thanks.

 

[money pit]

This should help

Great video, thanks. It really helped.

 

[money pit]

Moparts on the Web - Main Index

Thanks. This is a very good article. Very helpful.

 

[money pit]

Great video, thanks. It really helped.

I checked all the angles. Everything looks okay. Maybe the engine has a vibration that's transmitted to the driveshaft. I talked to my mechanic. He said to rev the engine and see if there's a vibration. There is a vibration. He then said to put a floor jack under the oil pan with a piece of wood and slightly lift the engine. The vibration is reduced but is still there. The motor mounts are about 2 yrs old but may need to be replaced. Is there anything else I need to look for? I heard the 360 is externally balanced. Are there weights on the torque converter? Or is it balanced with the harmonic balancer? Thanks

 

[heminut]

I heard the 360 is externally balanced. Are there weights on the torque converter? Or is it balanced with the harmonic balancer? Thanks

Harmonic balancer and flexplate.

 

[money pit]

Harmonic balancer and flexplate.

If you have weights on the torque converter, do you need a flex plate with weights?

 

[Adam]

If you have weights on the torque converter, do you need a flex plate with weights?

No, it’s one or the other… but be aware magnum and LA 360 balancers, flexplates, and converters are not interchangeable; they will bolt on but are balanced differently.

You can use a weighted flexplate with a neutral balance converter and vice versa.. also some aftermarket balanced flex plates like the B&M don’t have a weight but remove a piece from the other side to create an offset weight.

B&M 10236 B&M Flexplates | Summit Racing

Free Shipping - B&M Flexplates with qualifying orders of $109. Shop Flexplates at Summit Racing.

www.summitracing.com

 

[Challenger RTA]

That's what I was thinking.Also check rear end and suspension.bad tire it could be any thing wheel wheel bearing. you have to go through a process of elimination. Transmission mount motor mount,alignment.Bad u joint or needs grease,bad saddle.

 

[money pit]

No, it’s one or the other… but be aware magnum and LA 360 balancers, flexplates, and converters are not interchangeable; they will bolt on but are balanced differently.

You can use a weighted flexplate with a neutral balance converter and vice versa.. also some aftermarket balanced flex plates like the B&M don’t have a weight but remove a piece from the other side to create an offset weight.

B&M 10236 B&M Flexplates | Summit Racing

Free Shipping - B&M Flexplates with qualifying orders of $109. Shop Flexplates at Summit Racing.

www.summitracing.com

I'm going to take a look at the torque converter to see if there are weights. I think the torque converter was original to the trans. Thanks,

 

[money pit]

That's what I was thinking.Also check rear end and suspension.bad tire it could be any thing wheel wheel bearing. you have to go through a process of elimination. Transmission mount motor mount,alignment.Bad u joint or needs grease,bad saddle.

I've checked the pinion angle, the tires, and the motor mounts. I'm going to check the driveshaft. It's a new driveshaft and U joints. I'm going to check the torque converter to see if there are weights. Thanks

 

[Adam]

I checked all the angles. Everything looks okay. Maybe the engine has a vibration that's transmitted to the driveshaft. I talked to my mechanic. He said to rev the engine and see if there's a vibration. There is a vibration. He then said to put a floor jack under the oil pan with a piece of wood and slightly lift the engine. The vibration is reduced but is still there. The motor mounts are about 2 yrs old but may need to be replaced. Is there anything else I need to look for? I heard the 360 is externally balanced. Are there weights on the torque converter? Or is it balanced with the harmonic balancer? Thanks

If you have a vibration when reving the engine while parked then I don’t think it has anything to do with the driveshaft.

 

[Bug Guy]

Hey have you checked your u joint at the rear end might be bad?

 

[cuda joe]

to tell if it;s in the drive train ;drive the car in second gear at the same rpm as when you have the problem also i had chrome wheel lugs that bottomed out just as the wheel tightened viberated at 90 mph

 

[money pit]

If you have a vibration when reving the engine while parked then I don’t think it has anything to do with the driveshaft.

I'm going to change the motor mounts and go from there.

 

[money pit]

Hey have you checked your u joint at the rear end might be bad?

The drive shaft and u joints have about 250 miles on it. I pulled the driveshaft and it seems okay. Thanks.