Vibration After 4.10 Install, Is This Normal?

[2to3threE]

i just got my 4.10's installed, put about 200 city miles on it, drove for a bit then let it cool down, numerous times... Never got on it, i shift around 2800 most of the time, a few times i went to 3400 but never hammered it or got on it hard...


on the highway, anything below 65mph is good, anything over 85mph is good...

between 65mph & 85mph there is a vibration...its like timed every 1 second it phases in and out quickly...like this...

wuhmm....wuhmm...wuhm....wuhm...but i cant hardly hear and whine, or whisling for gear noise, or grinding....i feel it right below my BUTT....in the seat...

is it gears, or is it pinion angle? my car is lowered 2 inchs on h&r supersports but it never did this with the factory 3.55 gears...

i got ALL bearings and everything replced during the install...i bought the 80 dollar motive bearing kit with it from american muscle...

also running royal purple 75w140...

please help, thanks!

 

[Kuro!]

Was the bearing preload set correctly?

 

[Liberty911]

If there was no vibration prior to the gear switch, I would suggest taking a good look at the bolts holding the DS on. Make sure they are torqued properly and they are all there. The pinion angle would not change from a proper gear switch. Also, if you had a panhard bar/brace (if you have one) or other suspension removed during the gear install, you may want to jack up the rear, place some load on the suspension, and loosen and tighten the panhard bar/brace to ensure it was not tightened without the suspension loaded. Another option is that the DS is slightly out of balance because of how it was aligned when installed. You may want to unbolting the drive shaft, turning it a quarter and bolt it back up.

 

[AJ]

Was it shimmed properly

 

[UltraKla$$ic]

Sounds like a DS issue to me.

 

[Genius]

It's in your driveshaft or pinion angle!
A bad gear install would be constant noise or wine.
Do as Liberty911 said check your D/S bolts and rotate the shaft
1/4 turn and test drive repeat if necessary until it's smooth...
Keep in mind your D/S is spinning faster at any given speed now.
This can amplifie poor pinion angle due to your lowered springs...
But it really just sounds like your D/S is out of phase?
Gene

 

[2to3threE]

If there was no vibration prior to the gear switch, I would suggest taking a good look at the bolts holding the DS on. Make sure they are torqued properly and they are all there. The pinion angle would not change from a proper gear switch. Also, if you had a panhard bar/brace (if you have one) or other suspension removed during the gear install, you may want to jack up the rear, place some load on the suspension, and loosen and tighten the panhard bar/brace to ensure it was not tightened without the suspension loaded. Another option is that the DS is slightly out of balance because of how it was aligned when installed. You may want to unbolting the drive shaft, turning it a quarter and bolt it back up.

i watched him replace everything, he spent 4 hrs on it...dont know if he marked the driveshaft prior to removal thoguh...

he put panhard bar back on and used a prybar to move the rear end to the left a little and then fully tightend the panhard bar...

this is incorrect right?

what should i do then...

Was it shimmed properly

i hope so, he has been doing gears only for 15 years..

Sounds like a DS issue to me.

i think the same...

 

[2to3threE]

It's in your driveshaft or pinion angle!
A bad gear install would be constant noise or wine.
Do as Liberty911 said check your D/S bolts and rotate the shaft
1/4 turn and test drive repeat if necessary until it's smooth...
Keep in mind your D/S is spinning faster at any given speed now.
This can amplifie poor pinion angle due to your lowered springs...
But it really just sounds like your D/S is out of phase?
Gene

thanks man!

off topic:gas milage on highway is horrible, i could drive 80 miles, @ 80mph, and do it for 10-11 bucks....today it cost 13....

 

[s8v4o]

........ You may want to unbolting the drive shaft, turning it a quarter and bolt it back up.

+1, I would try this first.

 

[UrbanRedneck]

Like others said, there are a few reasons you could be having a driveshaft vibration now. One being if he didn't reinstall the shaft in the same position he removed it in. Also, the driveshaft is now spinning faster at any speed, so you may have a vibration due to driveshaft imbalance or pinion angle that you just never noticed before because of the higher speed it would have occured at. This happened to me, after 4.10 install I had a driveshaft vibration above 80 MPH. Axle Exchange driveshaft fixed it though.

 

[2to3threE]

Like others said, there are a few reasons you could be having a driveshaft vibration now. One being if he didn't reinstall the shaft in the same position he removed it in. Also, the driveshaft is now spinning faster at any speed, so you may have a vibration due to driveshaft imbalance or pinion angle that you just never noticed before because of the higher speed it would have occured at. This happened to me, after 4.10 install I had a driveshaft vibration above 80 MPH. Axle Exchange driveshaft fixed it though.

yea but with the 355 gears I have driven @ 100mph steady with no vibration...

that's about 85mph with 410

 

[2to3threE]

it seems that the vibrations have toned down by themself, is this normal?

also i checked the driveshaft and he marked the driveshaft with a white line...

what should i do now?

 

[killr3v]

Panic.

 

[2to3threE]

Panic.

and why am i doing this?

 

[dysan]

Calm before the storm!!!!

 

[1127stang]

I would definitely still focus on the DS.
Did he remove the shaft or seperate the two pieces? Mine vibrated like hell around 30 mph, sounded like driving over a rumble strip. I found out the trans had been out under warranty, and I suspect something had been disturbed to cause an out of balance or out of phase condition. I got Ford to buy me a new DS, which fixed the issue.......

 

[hopesmasher]

man im just about to pick up some 4.10's but this post is making me re-think.

 

[yellowjohn1]

man im just about to pick up some 4.10's but this post is making me re-think.

If you let threads like this change your mind about doing a mod, you may as well just not get in to mods at all. For just about any mod out there from cats to superchargers, there is a story from someone who has had bad problems. It's just a risk you take. Just research the parts before you buy and if you have someone else install, research them really well to lower your chance of something like this happening to you. You always have that chance of something bad happening though anytime you put new parts on your car.

 

[killr3v]

Sounds like install error. Probably didn't hook up the driveshaft correctly.

 

[iwaxmyjimmy]

Sounds like install error. Probably didn't hook up the driveshaft correctly.

Its what happens when you get bad gear set/ or someone didn't torque all the ring gear bolts down to 77 lbs and the tolerances are more than .004" variance in the hopefully 4 places they checked the backlash.