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 Post subject: Drivetrain noise when in gear
PostPosted: Thu Oct 12, 2017 8:54 pm 
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I am smitten with my van

Joined: Wed May 18, 2016 4:01 pm
Posts: 27
It may have been there all along, but I'm guessing not. It's a very faint "whoop" "whoop" noise which is rpm dependent, and is--I think--coming from the middle or rear of the van. If I'm motoring along on a quiet night below highway speeds I can hear it, but it stops if I shift into neutral and coast at the same speed. I'm guessing this eliminates the tires, but I wonder if the drive shaft turns when I'm coasting with my foot off the gas? I haven't yet checked for play in the drive shaft.

2001 AWD stock Astro


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 Post subject: Re: Drivetrain noise when in gear
PostPosted: Fri Oct 13, 2017 1:59 pm 
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I sleep in my van

Joined: Wed Feb 01, 2012 8:10 pm
Posts: 386
Location: southeastern ct
It could be a multitude of things. First off, yes your driveshaft will be turning. If your wheels are turning your driveshaft is turning. It seems your noise is load dependent. As in engine torque applied to your drivetrain dependent. Engine torque will induce loads on u joints, transmission bearings and so on that may cause your noise but only when under load. Good luck

_________________
Captn. Crunch
"I don't beat my rig-I use it to it's maximum potential"
1994 Safari conversion (sold) and miss'n it!
1999 Safari SLE AWD
np236 transfer case
Torsen rear w/3.73's
2" body lift
S-10 rear leafs
Corvette servo

Coming soon
Torsen limited slip cast iron front diff
Skid plates
Rock rails

Coming later
5.7 vortec V-8


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 Post subject: Re: Drivetrain noise when in gear
PostPosted: Sat Oct 14, 2017 3:27 am 
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I am smitten with my van

Joined: Wed May 18, 2016 4:01 pm
Posts: 27
Thanks. Maybe I'll start with the wheel bearings. Also, is it ever done that one starts a vehicle on a lift, tires in the air, and puts it in gear and accelerates to locate sounds?


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 Post subject: Re: Drivetrain noise when in gear
PostPosted: Tue Oct 17, 2017 5:35 pm 
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I sleep in my van

Joined: Wed Feb 01, 2012 8:10 pm
Posts: 386
Location: southeastern ct
Yes you can run a vehicle on a lift. Make sure it’s set well, make sure there is someone competent in the cab and make sure you pay very close attention to your surroundings while under a vehicle with rotating parts.

_________________
Captn. Crunch
"I don't beat my rig-I use it to it's maximum potential"
1994 Safari conversion (sold) and miss'n it!
1999 Safari SLE AWD
np236 transfer case
Torsen rear w/3.73's
2" body lift
S-10 rear leafs
Corvette servo

Coming soon
Torsen limited slip cast iron front diff
Skid plates
Rock rails

Coming later
5.7 vortec V-8


Top
 Profile  
 
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