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vibration in rear end when turning... #737839
July 02nd 2018 5:37 pm
July 02nd 2018 5:37 pm
Joined: Dec 2017
Posts: 88
nebraska
J
jason159 Offline OP
journeyman
jason159  Offline OP
journeyman
J
Joined: Dec 2017
Posts: 88
nebraska
Hi fellas, my '75 Dodge B100 SWB started making light noise/rumble, and a vibration that is "felt" through the chassis, coming from right rear wheel, while only making left turns AND it must be in gear, more noticeable the faster I'm driving, anything over 30mph. It WONT make this rumble while in neutral as I'm zig-zagging/testing, going down the road, which IMO cancels out a wheel bearing maybe? My initial thoughts are rear end going bad or transmission bearings. I figured a wheel bearing would do it always, no matter the transmission gear, including neutral, but??? I have newer U joints and my driveshaft was balanced too. Wheels are balanced, tires are newer, lug nuts are tight. When this turning/pressure is on the right rear wheel , in gear, is when it's noticed the most. Any thoughts, I love to hear them. Thanks!


1975 Dodge B100 shorty. 318, 3/tree
Re: vibration in rear end when turning... [Re: jason159] #737842
July 02nd 2018 7:25 pm
July 02nd 2018 7:25 pm
Joined: Jan 2001
Posts: 2,263
East Brady, PA
M
Meanmachine Offline
veteran
Meanmachine  Offline
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M
Joined: Jan 2001
Posts: 2,263
East Brady, PA
Get a buddy to help you, jack up the rear tires off the ground and put it in gear and neutral and see if you can hear any rotation noises, while accelerating and braking.

Re: vibration in rear end when turning... [Re: Meanmachine] #737852
July 02nd 2018 9:09 pm
July 02nd 2018 9:09 pm
Joined: Dec 2017
Posts: 88
nebraska
J
jason159 Offline OP
journeyman
jason159  Offline OP
journeyman
J
Joined: Dec 2017
Posts: 88
nebraska
Originally Posted by Meanmachine
Get a buddy to help you, jack up the rear tires off the ground and put it in gear and neutral and see if you can hear any rotation noises, while accelerating and braking.

OK, will do thank you!


1975 Dodge B100 shorty. 318, 3/tree
Re: vibration in rear end when turning... [Re: jason159] #738064
July 10th 2018 12:33 am
July 10th 2018 12:33 am
Joined: Jul 2018
Posts: 5
Victoria, BC
I
islander Offline
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islander  Offline
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I
Joined: Jul 2018
Posts: 5
Victoria, BC
did you change the diff fluid recently? I had this problem and had to add a bottle of mopar friction modifier. I've got the locking diff, and I guess without the friction modifier it can't decide if it wants to lock or not. Just throw in half a bottle, and do some figure 8s around a parking lot until the noise disappears.

granted mine happened only at very low speed.

Re: vibration in rear end when turning... [Re: islander] #738109
July 10th 2018 8:45 pm
July 10th 2018 8:45 pm
Joined: Dec 2017
Posts: 88
nebraska
J
jason159 Offline OP
journeyman
jason159  Offline OP
journeyman
J
Joined: Dec 2017
Posts: 88
nebraska
Originally Posted by islander
did you change the diff fluid recently? I had this problem and had to add a bottle of mopar friction modifier. I've got the locking diff, and I guess without the friction modifier it can't decide if it wants to lock or not. Just throw in half a bottle, and do some figure 8s around a parking lot until the noise disappears.

granted mine happened only at very low speed.


Yes I've changed it, but I used good 'ol 80w90 gear oil. I don't think I have a locking diff, I guess I'm not sure though. I replaced the axle bearing and this did not fix my issue, darn it.


1975 Dodge B100 shorty. 318, 3/tree
Re: vibration in rear end when turning... [Re: jason159] #738132
July 11th 2018 10:28 am
July 11th 2018 10:28 am
Joined: Dec 2017
Posts: 88
nebraska
J
jason159 Offline OP
journeyman
jason159  Offline OP
journeyman
J
Joined: Dec 2017
Posts: 88
nebraska
So it's not the rear axle bearings, I replaced them. I'm now thinking the transmission bearings, not sure exactly which component, because It only makes the noise if it's in gear....worse when the throttle is applied, it can be felt going straight under acceleration and worse while turning left. Just annoying, lol


1975 Dodge B100 shorty. 318, 3/tree
Re: vibration in rear end when turning... [Re: jason159] #738173
July 11th 2018 7:55 pm
July 11th 2018 7:55 pm
Joined: Mar 2016
Posts: 335
Tucson,Az.
H
Hasan Ben Sobar Offline
enthusiast
Hasan Ben Sobar  Offline
enthusiast
H
Joined: Mar 2016
Posts: 335
Tucson,Az.
Turning rules out engine or trans. unless something isn't bolted down.


Tucson-it's a dry heat...like an oven
Re: vibration in rear end when turning... [Re: jason159] #738200
July 12th 2018 10:22 am
July 12th 2018 10:22 am
Joined: Nov 2016
Posts: 59
Cypress California
V
Vannible_Lecter Offline
journeyman
Vannible_Lecter  Offline
journeyman
V
Joined: Nov 2016
Posts: 59
Cypress California
pinion gear?

Re: vibration in rear end when turning... [Re: jason159] #738201
July 12th 2018 10:22 am
July 12th 2018 10:22 am
Joined: Nov 2016
Posts: 59
Cypress California
V
Vannible_Lecter Offline
journeyman
Vannible_Lecter  Offline
journeyman
V
Joined: Nov 2016
Posts: 59
Cypress California
pinion gear?

Re: vibration in rear end when turning... [Re: Vannible_Lecter] #738232
July 12th 2018 8:02 pm
July 12th 2018 8:02 pm
Joined: Dec 2017
Posts: 88
nebraska
J
jason159 Offline OP
journeyman
jason159  Offline OP
journeyman
J
Joined: Dec 2017
Posts: 88
nebraska
Originally Posted by Vannible_Lecter
pinion gear?

I've no experience yet with rear end parts but that's what I'm afraid of, lol.


1975 Dodge B100 shorty. 318, 3/tree

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