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Old 04-16-2018, 03:42 PM   #1
ACII
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Replace u-joint with CV joint ??

Hello together..

since my LS1 / 4l60e swap into my 51 chevy pickup....do i have a Vibration between 65 to 80 mph...
So far i read hours for hours about pinion angle etc. etc. and tried some alignments without satisfying results...

Therefore i am thinking just to replace the sensitive U-Joints with some CV-Joints.. but so far i did not find any thread in the www to such a Replacement...

Would be great if u can give some Feedback , if an Installation of CV-Joints at a drive shaft is possible ??

Hope to hear from you soon

Thanks
Achim
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Old 04-16-2018, 05:04 PM   #2
Bigdav160
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Re: Replace u-joint with CV joint ??

Sure.

Denny's driveshaft carries all the parts. Make sure you get the proper weld-in yoke for your tube and make sure to weld the yoke in phase.

I've done it.
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Old 04-17-2018, 01:48 AM   #3
ACII
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Re: Replace u-joint with CV joint ??

thanks for ur quick response..

Do u may have a picture of the installed CVs ???

Thanks a lot
Achim



Quote:
Originally Posted by Bigdav160 View Post
Sure.

Denny's driveshaft carries all the parts. Make sure you get the proper weld-in yoke for your tube and make sure to weld the yoke in phase.

I've done it.
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Old 04-17-2018, 12:25 PM   #4
DieselSJ
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Re: Replace u-joint with CV joint ??

Angles...

With u-joints, you want the angle at the trans and the angle at the pinion to match. So if your driveshaft has a 5 degree down at the trans end, you want a 5 degree up at the pinion end. Basically you want the output shaft of the trans and the pinion shaft to be parallel with each other. Also true for side-to-side where you want the angles to match between the trans and the pinion. If you really want to get technical, you actually can run the pinion 2-3 degrees down from where you want it to compensate for torque while you are moving.

With a CV, you want the pinion to point directly at the tailshaft of the trans. There should be 0 degree difference between the pinion angle and the driveshaft angle.
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Old 04-17-2018, 04:25 PM   #5
ACII
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Re: Replace u-joint with CV joint ??

Hy

thanks for the Information..

to put the rear axle to the same line / angle than the drive shaft shouldnt be a Problem ... i do have a 4-link Setup

Would you recommend a double cardan slip yoke ? i want to stay with a one Piece drive shaft....

Are these double cardan Joints are less sensitive against vibrations etc. ??

thanks
Achim





Quote:
Originally Posted by DieselSJ View Post
Angles...

With u-joints, you want the angle at the trans and the angle at the pinion to match. So if your driveshaft has a 5 degree down at the trans end, you want a 5 degree up at the pinion end. Basically you want the output shaft of the trans and the pinion shaft to be parallel with each other. Also true for side-to-side where you want the angles to match between the trans and the pinion. If you really want to get technical, you actually can run the pinion 2-3 degrees down from where you want it to compensate for torque while you are moving.

With a CV, you want the pinion to point directly at the tailshaft of the trans. There should be 0 degree difference between the pinion angle and the driveshaft angle.
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Old 04-17-2018, 05:16 PM   #6
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Re: Replace u-joint with CV joint ??

Quote:
Originally Posted by DieselSJ View Post
Angles...

With u-joints...Basically you want the output shaft of the trans and the pinion shaft to be parallel with each other. Also true for side-to-side where you want the angles to match between the trans and pinion.
So parallel but offset?
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Old 04-17-2018, 08:16 PM   #7
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Re: Replace u-joint with CV joint ??

They don't have to be offset.

Double cardan joints are common on 4x4's where angle is extreme enough that it would wear a regular pair of joints out quickly.

They were also used on Cadillacs in the 60's and 70's to minimize vibration.

I built some shafts for a buddies Ford Bronco Cummins conversion. He hasn't complained. Sorry no pictures.
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Old 04-18-2018, 12:47 AM   #8
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Re: Replace u-joint with CV joint ??

Quote:
Originally Posted by SunSoaked View Post
So parallel but offset?
Yes. Rarely will they be in line with each other.

U-joint-


CV -
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Old 04-18-2018, 12:52 AM   #9
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Re: Replace u-joint with CV joint ??

Quote:
Originally Posted by ACII View Post
Hy

thanks for the Information..

to put the rear axle to the same line / angle than the drive shaft shouldnt be a Problem ... i do have a 4-link Setup

Would you recommend a double cardan slip yoke ? i want to stay with a one Piece drive shaft....

Are these double cardan Joints are less sensitive against vibrations etc. ??

thanks
Achim

Slip-yoke all depends on your transmission. There has to be slip somewhere. If you have a slip yoke output on your trans then that is where the slip goes. if your trans has a fixed output, then the slip will be built into the shaft. **TYPICALLY** a CV will be used with a fixed output and use a slip on the shaft. Actually, I have never seen a CV used with a slip type trans output.
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