Vibrations Part 3 Driveline angles

Still fighting vibrations, so dialed in my driveline angles.

Unfortunately, found some bad news!

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[musclebone]

Yup! I can see the wobble. That axle is bent. Years I ago I was gonna replace my stock 10-bolt 8.2 with a aftermarket 12-bolt rear-end, but I changed my mind because I do not drag race at the track. I installed a eaton posi with 3.36 gears and left the stock axles. The rear end performs flawless. No noise, no clunking, and floats down the highway smooth. I hope that you can figure out your issue 🙂

[KINGRG]

This video is old now but, I just wanted to say that the howling is a direct result of changing upper and or lower control arms from rubber bushings to poly or spherical (which are incredibly louder than poly). I myself removed the original UCA’s and LCA’s on my Mustang (factory rubber bushings) and also removed the diff housing bushings (also rubber) and changed it all out with spherical parts from BMR.

On the first test drive after the install of the aforementioned parts, at around 15 mph I thought I blew my diff. I had a loud harmonic howling coming from the rear of the car which resonated throughout the body of the interior. I was confused.. The 2nd thing I noticed was metal on metal clunking when turning.. After parking the car and jumping on several forums I learned something. And well, guess what? This is the exact nature of spherical bushings. Anytime you replace a rubber part in the drivetrain with a metal counterpart (or even poly) you introduce a tremendous amount of noise and resonance into the body of the car.

Take it from me, there’s a give and take with every modification. However you have to find YOUR happy medium and that all is subjective to the individual. I wanted to launch and hook better (which I do with spherical bushings) but it came at the cost of a quiet ride with no howling.

Happy modding.

[fasterthanyou]

I think you need a backlash adjustment… a small shim in the pinion gear to bring it a hair closer to the ring gear should take up that slack

[roberttrapizona]

Wow this is disturbing to see, I bought a Moser almost 9 months ago but have not driven the car was waiting for other parts to come in, I should be on the road soon hope I don't have this be following to see what happens, good luck with your fix.

[thethrottlecracker]

Good video, thanks. I have a V8 swapped Supra with 2 peice shaft, and IRS. I'll check the angles that can actually be adjusted.

[MrGsxr]

I"m 64 years old and been around hot rods and drag racing most of my life. Ran a 5 second drag bike that I spent untold gobs of money on. I finally figured it out. You will never cruze the miracle mile.... stop spending all that money and time building cars to empress people. Most people now a days dont even notice a muscle car drive by them. Save that cash up for when you get old. Your gonna need it some day if things go south and you cant work any more or get put out of a job .

[johnkemple]

I think the axle is bent and the axle housing..This may be why the axle is bent yet again..

[UnapologeticAmerican]

I'm fighting a vibration issue in my 67 Mustang. Driv8ng me up a wall trying to figure it out. Thanks for saying what ap you used to check your angles. I down loaded it. Will check mine tomorrow.

[quickboat]

I went with Moser also. Used the 33 spline and TruTrack. Can you swap from side to side and see if the wobble follows the axle?

[brocksutliff]

I’m having a severe vibration at 70mph and above. Mine is a dragNdrive car that I’ve just got put back together and it’s unbearable to drive. But after seeing this, I’m going to check to see if one of my 35 spline moser axles is bent. I have a procharged ls making a thousand wheel horse and its still a factory 12 bolt housing that’s been braced but I know I need a more stout rearend to really get after it safely. Thanks for making this video

[bluedog]

A lot of codswallop. Measure the up or downward angle of the motor/transmission and the up or down angle of the pinion. These angles should be parallel. I.E, if motor is 3 degees down, the pinion should be 3 degrees up. It aint rocket science.

[Rusty-Oleum]

sounds like its time for a different housing manufacturer, dutchman, mark williams, or currie for a 9in

[brenna]

I'm not sure where you are with your Vibrations now ? You sure spent sometime with the video I feel YOUR PAIN !!! ill been thou all of it .... and still not completely gone.... /// I also has a 70 SS LS 6 in the 70's no Vibrations problems , ,, Did you say that you were getting whining noise ?? ( FYI ) many the gears are not set up correctly OR if the gears are not OEM gears they whin even if they are set-up perfect because they are not cut correctly ...

[GPXironczech]

Funny ive been fighting the SAME EXACT issue for some years now. 10 bolt with moser axles. This is second set I've put in it and still same shit

[HemiDartGT]

I feel your pain, the joys of hot rodding...

[osdmike]

Check if the drive shaft is bent. I bought a brand new Tremec 5-speed kit, including a brand new drive shaft. After installation I had vibrations. It turned out that the drive shaft was slightly bent. I had the drive shaft straighten and balanced, then the vibrations stopped.

[isaacisrael]

Hey bud I don’t know if you got it figured out yet but I’m watching and it seems like that ring gear tooth is chipped and the backlash is a bit loose the tooth on the gear seems to be getting hotter than normal as well I could be wrong but heat will deform metal and been a set that needs to work together if it’s not working together it’s gone cause problems

[Druze_Tito]

What Frankenstein vehicle is that with so many elementary problems?

[colinrosenthal]

Good to see you got some of the driveline vibes out. As for the axle, I would do 3 things. Cheque how straight the shot is from the axle bearing to the female spline in the Detroit. You could do it with a laser cartridge from a rifle and an adapter made on a lathe or some other kind of laser level. Check check the straightness of the female spline in the Detroit itself. Maybe you can spin it on a stand and see if it wobbles too. If both of those are near perfect then you likely need a different housing. Maybe the housing has a crack in the bearing area that you can’t see but opens up and deflects when torque is applied.

[zl]

That does suck.. Hope you figure it out. I was thinking about going with a Moser 12 bolt for my 68 if I ever decided to build a big block for it. I think I will just go to an s60 and pray I don't have to go through something like this.