Competition Drive shaft angles...w/carrier

[jwilliams3]

I recently had problems with 1st and 2nd gear take off vibration.

I narrowed it down the the driveshaft angle aft of the carrier unit (too much downward angle).



Well I installed about . 5" worth of stock above the carrier unit and this has almost aligned both shafts together.

There is still about a couple degrees of downward angle after the carrier housing.



All take off vibration is gone.



My question: Can the shafts be aligned too perfectly? or should I have a certain amount of downward angle to allow for upward articulation of the rear axle?? (ie sledpulling, heavy loads etc. ?)



?????

Thanks for the help!

 

[drrhoades]

You need to have some angle between the driveshafts so that the needle bearings in the u-joint bearing cups can spin. If you have no angle at all then the needle bearings may flat spot from not moving.

 

[RacinDuallie]

I had problems with the bearing between the two shafts- (split shaft rear driveshaft)

I kept on going thru them. The fix for me was to remove the weakest link in the chain-

Eliminate the 2pc. rear driveshaft- Had a 1 pc. one made 4" dia. - and was Dynamically Balanced- Larger ( 2 sizes up from stock) U-Joints.



Fixed My problems ever since. Just a Thought.

 

[TractorNut]

jw. . I'm glad you posted this. . and I have been thinking of what to try on my truck. . Seems to have the same problem... kind of a roar. . vibration through the truck when taking off with a load. . I never really noticed it. . because its always been there. . until other people started mentioning it... I have replaced the rubber in the carrier. . but not the bearing. . looks like I due for another center U joint...

RD. . do U think it was the one piece shaft that make it better or the fact that it was balanced better??? Any dissadvantages to the one peice shaft. . other than its a mile long???

Thanks

Bryan

 

[Sled Puller]

I have had plenty of driveshafts that a U-joint is straight, and they don't wear any faster than the ones with angle??



Was there a lift kit involved? Double check make sure your yokes are lined up.

There is a degree that they need to be at. Danged if I can remember it!

 

[jwilliams3]

Stock lift.

 

[RacinDuallie]

jw. . I'm glad you posted this. . and I have been thinking of what to try on my truck. . Seems to have the same problem... kind of a roar. . vibration through the truck when taking off with a load. . I never really noticed it. . because its always been there. . until other people started mentioning it... I have replaced the rubber in the carrier. . but not the bearing. . looks like I due for another center U joint...

RD. . do U think it was the one piece shaft that make it better or the fact that it was balanced better??? Any dissadvantages to the one peice shaft. . other than its a mile long???

Thanks

Bryan

TractorNut-

After I got rid of that 2pc. set up for a 1pc. all vibrations and problems dissappered!! I went thru 5 center joint assemblies and had enough of it.



Take out the weakest link.

 

[SRadke]

I had the launch shudder when heavily loaded. It was a pinion/driveline angle problem. Now with my lift and 4-link I've spaced the carrier down 1", rolled the pinion up a bit, and all the vibes are gone. It seems these things are really sensitive to driveline angles.



-Scott

 

[RacinDuallie]

Had the launch shudders, the highway vibrations, howling- all gone since!

 

[TractorNut]

Thanks guys. . I"m going to try shimming the transmission down and the carrier first... one piece shaft lastly...

Bryan

 

[jwilliams3]

Just go for the carrier.

The angle on my truck would not have benefited from the transmission being lowered.

The bad point was clearly the carrier being to high.

 

[RacinDuallie]

one piece shaft lastly...

Bryan

I tried everything and the only thing THAT WORKED for me was 1pc. shaft- specify it Dynamically Presision Balanced- It's been problem free!

 

[TractorNut]

Well. . its not like I'm out anything by making the shims. . Only take a few mins to cut and drill... but I'll be looking at the one piece shaft. . after I get the front end lined up. . (waiting on my 03 track bar kit. . )

On the one piece shaft. . I'm guessing you used the stock front yoke??? Just curious to what you up graded the U joints too... .

Bryan

 

[Beast2B]

try the shims, keep them as small as possible, too much will kill your t-case u-joint... i went thru 2 in several months. it's the pinion climbing under loaded acceleration, right? mine was. i went to a CV rear shaft with the carrier in the stock location. no stress on the first (t-case) u-joint because it's back inline with carrier, cv directly behind the carrier and slip joint at the back with the pinion just lower than straight with the driveshaft. High Angle Driveline ( www.highangledriveline.com ) in Paradise, CA (common with rock crawlers), ask for Jesse.

 

[RacinDuallie]

So it's been a few days now how did you make out?

 

[TractorNut]

Well. . I haven't made out...

Ran into some other problems with one of my other projects... but I should at least get a shim made today or tomorrow...



#ad


Just a little hole... that's looking from the water jacket into the cylinder. . This is an antique puller I am building. . that happend on the first run on the dyno... :{

Bryan

 

[SRadke]

Ouch! Is it lined? Looks like it may be from the picture. Hope you can get that straightened out without a new block.



-Scott

 

[RacinDuallie]

Ouch! Is it lined? Looks like it may be from the picture. Hope you can get that straightened out without a new block.



-Scott

OOOOOOOOFFF!!! That Sucks!! :{

Let us know what you do to solve your driveline woes. Seems to be a common problem.

 

[TractorNut]

No sleaves... but there will be... That hole is 1. 25-1. 50 long... (I'm just hoping the rods and crank are Ok. . ) I'll get those dang shims made... and reply...

Bryan

 

[RacinDuallie]

So it's been a few days now how did you make out?

So it's been a few more days now how's it goin? or not?