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93 G20 Vibration/Drone/Clunking Sound #758091
March 19th 2020 7:40 am
March 19th 2020 7:40 am
Joined: Aug 2005
Posts: 20,464
Brooklyn Park, Maryland, USA
NateB Offline OP
Supreme Master
NateB  Offline OP
Supreme Master
Joined: Aug 2005
Posts: 20,464
Brooklyn Park, Maryland, USA
I'm getting a drone/vibration at highway speeds and also when I let up off the accelerator I can hear a clunking/knocking sound from underneath right below the front seats.

A little history. I had the rear diff rebuilt with new everything...axle bearings/seals and a 3.73 Dana True-Trac posi kit. All checks out good back there. Also had new u-joints installed, but then had a catastrophic failure of one of the u-joints on the highway. Had the van towed back to the shop that replaced the u-joints, but the damage was so severe they had to have a new driveshaft made. I've had the driveshaft checked twice and it's in balance.

I'm at a loss here...u-joints are tight, rear diff is good, driveshaft is in balance, but I have a sneaking suspicion that the bearing/bushing in the trans tailshaft is shot. I do believe the trans mount is fine as I had that replaced a couple of years ago.

Thoughts?


Nate Breece
--------------
2008 Dodge Caravan
1993 Chevy G20
Re: 93 G20 Vibration/Drone/Clunking Sound [Re: NateB] #758095
March 19th 2020 9:12 am
March 19th 2020 9:12 am
Joined: May 2018
Posts: 1,173
TN
Astrocreep66 Offline
old hand
Astrocreep66  Offline
old hand
Joined: May 2018
Posts: 1,173
TN
Which van? Sounds like tail shaft, I would start at torque converter bolts and work my way back being that it seems to be making noise at front seat area.. just my thoughts.


When in doubt..get the sawzall out..
Re: 93 G20 Vibration/Drone/Clunking Sound [Re: NateB] #758096
March 19th 2020 10:21 am
March 19th 2020 10:21 am
Joined: Sep 2005
Posts: 8,894
Hickory Flat, Jawga
CatFish Offline
carpal tunnel
CatFish  Offline
carpal tunnel
Joined: Sep 2005
Posts: 8,894
Hickory Flat, Jawga
Hey Nate!
You should check the tail shaft just to be sure but that may not be your problem.
The noise you're describing sounds like every True-Trac posi I've ever heard. They're known to snap/crackle/pop/clunk, especially at lower speeds and even going straight ahead. The hollow driveshaft transmits the sound to the front.

My2%.

Re: 93 G20 Vibration/Drone/Clunking Sound [Re: NateB] #758099
March 19th 2020 11:18 am
March 19th 2020 11:18 am
Joined: May 2018
Posts: 1,173
TN
Astrocreep66 Offline
old hand
Astrocreep66  Offline
old hand
Joined: May 2018
Posts: 1,173
TN
My 73 has a posi and was doing all kinds of knocking and clunking, I tried the left ,right, left hard steer no different, I found a receipt from the shop that serviced it it had standard 80/90 in it, got a couple small bottles of friction modifier no more noise. And yeah what Catfish said.😁


When in doubt..get the sawzall out..
Re: 93 G20 Vibration/Drone/Clunking Sound [Re: NateB] #758108
March 19th 2020 1:32 pm
March 19th 2020 1:32 pm
Joined: Jun 2010
Posts: 14,714
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 14,714
Van Diego California
I hear N feel the same thing in my 92 with posi …. I was told its the clutch paks in the rear slippin when turning.


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Re: 93 G20 Vibration/Drone/Clunking Sound [Re: NateB] #758135
March 19th 2020 9:54 pm
March 19th 2020 9:54 pm
Joined: Sep 2005
Posts: 8,894
Hickory Flat, Jawga
CatFish Offline
carpal tunnel
CatFish  Offline
carpal tunnel
Joined: Sep 2005
Posts: 8,894
Hickory Flat, Jawga
Dana True-Trac is a planetary gear system, very tough. And they can be noisy when they lock and unlock as there is, of course, clearance in all those gears between the axles. Not a bad thing, just takes some getting used to.....

Last edited by CatFish; March 19th 2020 9:55 pm.
Re: 93 G20 Vibration/Drone/Clunking Sound [Re: NateB] #758291
March 24th 2020 12:12 pm
March 24th 2020 12:12 pm
Joined: Aug 2005
Posts: 20,464
Brooklyn Park, Maryland, USA
NateB Offline OP
Supreme Master
NateB  Offline OP
Supreme Master
Joined: Aug 2005
Posts: 20,464
Brooklyn Park, Maryland, USA
Hmmmm. I'm running Amsoil synthetic lube 75W-140. Rear was rebuilt by a Jeep/4x4 specialty shop and that's the lube they use. Like Catfish said, no clutches but all gears. If that's the noise they make, then I'll live with it, but the vibration/drone has to be something different.


Nate Breece
--------------
2008 Dodge Caravan
1993 Chevy G20
Re: 93 G20 Vibration/Drone/Clunking Sound [Re: NateB] #758292
March 24th 2020 12:20 pm
March 24th 2020 12:20 pm
Joined: Aug 2005
Posts: 20,464
Brooklyn Park, Maryland, USA
NateB Offline OP
Supreme Master
NateB  Offline OP
Supreme Master
Joined: Aug 2005
Posts: 20,464
Brooklyn Park, Maryland, USA
I kinda wish now I would've had a stock rebuild done, but noooooooooo I had to get all fancy and sh*t. lol


Nate Breece
--------------
2008 Dodge Caravan
1993 Chevy G20
Re: 93 G20 Vibration/Drone/Clunking Sound [Re: NateB] #758305
March 24th 2020 4:51 pm
March 24th 2020 4:51 pm
Joined: May 2018
Posts: 1,173
TN
Astrocreep66 Offline
old hand
Astrocreep66  Offline
old hand
Joined: May 2018
Posts: 1,173
TN
I had a mini spool in my Astro.. count your blessings.lol


When in doubt..get the sawzall out..
Re: 93 G20 Vibration/Drone/Clunking Sound [Re: NateB] #758306
March 24th 2020 4:52 pm
March 24th 2020 4:52 pm
Joined: May 2018
Posts: 1,173
TN
Astrocreep66 Offline
old hand
Astrocreep66  Offline
old hand
Joined: May 2018
Posts: 1,173
TN
I had a mini spool in my Astro.. count your blessings.lol


When in doubt..get the sawzall out..

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