noise & vibration (1 Viewer)

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R

rem_7mmSTW

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Jun 28, 2004
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Thought I'd ask the gurus here.
My problem is noise and vibration.

Project:
73 Cruiser, 383 Stroker, TH350, NP205, linked / chopped Ford 9" 542 gears, locked mini spool, SOA, 35" Pro Comps, crazy HP...

I just got the motor back, slapped in, test ran and yanked the pinion out of the 3rd member:frown:
Changed gears to 542, mini-spool.
Before I blew the driveshaft, then pinion, I had some vibration, but now with the latest build, the vibration is worst than ever. Not as much noise & vibration during acceleration as with deceleration... and no noise and vibration until ~ 30 mph and higher. The higher the speed, the worse it gets..
I know this sounds typically like a ring & pinion mis-alignment, but I have suspicion of the np205.

Any ideas before I start tearing things down to try to diagnose?
Has anyone ever wittnessed an NP205 going bad? What are the symptoms?
 
you start wiggling driveshafts?

Did you get the DS balanced..

Are your angles good.


Why don't you take a pic ;)
 
Hey Mace, good to hear from you again.

Yes, the DS was balanced, although it did take a hit when I spun the pinion in two...
It's been back to Jess - Hi-Angle before I broke pinion for modification and re-balancing. I can't remember if the vibration was present before last re-work from HADL..
Wonder why it would fault mostly on deceleration?

thanks for the reply.
 
Here's some recent pics
Copy of DSCN0132.JPG
DSCN0130_1.JPG
DSCN0078_1.JPG
 
I'll get some better pics of the DS and angles.
 
better pics
DSCN0382.JPG
DSCN0380.JPG
 
???

Why the 4 link and leaf springs?

JR
 
JRFJ4- said:
Why the 4 link and leaf springs?

JR
Click to expand...

Floater kits (used in drag car racing). The leafs actually float on axle and allow arc travel action from linked systems.
 
looks like you driveshaft is out of phase....make sure the u joints line up
 
I would also say Drive shafts out of balance or as in the one picture, there is a red arrow sticker on the end of the drive shaft. YOu have to make SURE that the red arrows line up to meet each other or the shaft may not balance right.

I had the same deal on my high angle drive line. I took it apart to do some work, put it back together with the red arrows close but not exact and it shook like a paint mixer. Took it back apart and did it right and it worked great.
 
Thanks for all of the input.
I found the problem. It was indeed the DS. Unfortunately, I force found it and tore up some DS pieces. So now I'm researching an alternative solution for DS build...
I spoke to one guy that is offering a ~ 40deg angle solution accomplished with a 1.5 ton set-up, but for ~ $900. Anyone have suggestions or recomendations on an alternate (cheaper than $900) solution? Man, I already had $1100 in this one from HIDL ($650 for original build, and a $450 repair/rebuild). I know you have to pay to play, but I've already payed real $$, and tore it to pieces.
My angle is more than HIDL can accomplish with 1350 setup, and won't warranty a 1410 setup for road use. I don't rock crawl, the rig is a weekend warrior, tire smoking street cruiser with 573 dyno HP. On launch, the 4-link is holding the axle solid, but torque is therefore pushing up on the frame and raising the lift of the vehicle, therefore changing the DS angle a few deg. This in turn, is pushing the angle of the DS beyond it's capability.

thanks,
 
rem_7mmSTW said:
On launch, the 4-link is holding the axle solid, but torque is therefore pushing up on the frame and raising the lift of the vehicle, therefore changing the DS angle a few deg. This in turn, is pushing the angle of the DS beyond it's capability.
Click to expand...

So are you gonna fix that problem too?
 
camcruiser13 said:
ditch the leaves and go coils
Click to expand...

Ya, along with a high pinoin and move the lower links down a couple inches. Whats a high 9 worth? Bout what you have invested in the D/S already? You might get away with a simpler and cheaper D/S to go to a high 9.
 
FLYINGLOW said:
Ya, along with a high pinoin and move the lower links down a couple inches. Whats a high 9 worth? Bout what you have invested in the D/S already? You might get away with a simpler and cheaper D/S to go to a high 9.
Click to expand...

Last I checked ~ 2200 for a high 9.
But you're right, high 9 would have been a whole lot better. Hind sight is always 20/20... If I had to do it over, there'd be a whole lot of changes i.e. 14bolt, coil-overs, the list is long...

I did speak w/ HIDL today, gonna send mine in for another build w/ 1410 CV & flange to get up to 40deg.
 
rem_7mmSTW said:
Last I checked ~ 2200 for a high 9.
But you're right, high 9 would have been a whole lot better. Hind sight is always 20/20... If I had to do it over, there'd be a whole lot of changes i.e. 14bolt, coil-overs, the list is long...

I did speak w/ HIDL today, gonna send mine in for another build w/ 1410 CV & flange to get up to 40deg.
Click to expand...

OK, shows what I know about high 9's. You gotta do something to change your suspension issues or this will happen again. In one of your posts you say that when you launch the axle is solid, but the back of the truck lifts (antisquat) changing the angle. If the truck is lifting then the angle should actually get better. I think the links aren't mounted far enough apart (vertically) to hold the axle. I think you should have the lower links mounted lower, if not on the bottom of the axle tube. Fix it right or you will have to go through this again. Some of the other guys here know more about 4 links than me, but thats my $0.02.
 
camcruiser13 said:
ditch the leaves and go coils
Click to expand...

I've been thinking of doing just that for a while now.
What type of coil-overs are you-all using these days? Length is determined, but what rating / pre-load?
If I choose the treasure yard option, do you have knowledge on what set-up from what kind of vehicle would I look to salvage that would be most painless to adapt?
I could probably find a good discussion / argument on the topic if I search this sight...

thanks,
 
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