Pulsating noise under load.. Driveline, exhaust?
10-25-2018, 03:51 PM
#1
1st Gear Member
Thread Starter
Join Date: Dec 2012
Location: MA
Posts: 113
Pulsating noise under load.. Driveline, exhaust?
Hey guys, I've got a situation with my stang thats driving me nuts.. Especially while cruising on the highway. I have a 4.0, mated to a rebuilt TR3650 with a GT aluminum driveshaft and 8.8 rear end.. Borla dual exhaust
As the title says, I have a "driveline" noise that pulsates/drones whenever I am on the gas, no matter the gear... Pop the trans in neutral, and the noise vanishes. Its easier to hear the noise at speeds above 30+ mph and around 2k-ish RPM's
I feel like it might be the exhaust, because its super loud under load and much quieter without one (just revving in neutral, even at highway speeds).. TIA!!!
As the title says, I have a "driveline" noise that pulsates/drones whenever I am on the gas, no matter the gear... Pop the trans in neutral, and the noise vanishes. Its easier to hear the noise at speeds above 30+ mph and around 2k-ish RPM's
I feel like it might be the exhaust, because its super loud under load and much quieter without one (just revving in neutral, even at highway speeds).. TIA!!!
10-25-2018, 04:55 PM
#2
Banned
Join Date: Jan 2018
Location: Pennsylvania
Posts: 2,327
I get noises like that even with my automatic, and yep, pop it in neutral and it goes
away. When the A/C is on, idle in gear, the thing growls. When the A/C kicks off, it
stops. If I ease it forward wile it's growling, it pulsates, and I mean, like, EASE
as in granny crawl forward. If I put it in "2" it lowers a little... Never heard a car
do that before, growl like that...
away. When the A/C is on, idle in gear, the thing growls. When the A/C kicks off, it
stops. If I ease it forward wile it's growling, it pulsates, and I mean, like, EASE
as in granny crawl forward. If I put it in "2" it lowers a little... Never heard a car
do that before, growl like that...
10-25-2018, 07:47 PM
#3
1st Gear Member
Thread Starter
Join Date: Dec 2012
Location: MA
Posts: 113
I get noises like that even with my automatic, and yep, pop it in neutral and it goes
away. When the A/C is on, idle in gear, the thing growls. When the A/C kicks off, it
stops. If I ease it forward wile it's growling, it pulsates, and I mean, like, EASE
as in granny crawl forward. If I put it in "2" it lowers a little... Never heard a car
do that before, growl like that...
away. When the A/C is on, idle in gear, the thing growls. When the A/C kicks off, it
stops. If I ease it forward wile it's growling, it pulsates, and I mean, like, EASE
as in granny crawl forward. If I put it in "2" it lowers a little... Never heard a car
do that before, growl like that...
10-26-2018, 03:51 AM
#5
Banned
Join Date: Jan 2018
Location: Pennsylvania
Posts: 2,327
No, sorry, I have a V6 Auto, and it makes that growling noise, and it is being generated
by the motor. As I said, when the A/C is on, it's much worse at idle. Also, in fact, it got
worse when I put new plugs in. Performs better, but growls, and only at idle in gear
with the A/C on, since there is a "load" on the motor. When I accelerate, it will hit
around 1100-1200 RPM and growl, then stop once it gets above that, so it's a quick
growl. Only under load, does it do that... My son even told me when he drove it
for the first time he was like "Dad, your car growls.." I said yeah, I know...
I am going to check the motor mounts, and trans mount when I can.
Also, FYI, that manual trans you have is notorious for noise, you can look that up, it's
actually quite common.
It's not the diff, and I changed the oil last month, and what I took out was clean, so I
did not really have to.
by the motor. As I said, when the A/C is on, it's much worse at idle. Also, in fact, it got
worse when I put new plugs in. Performs better, but growls, and only at idle in gear
with the A/C on, since there is a "load" on the motor. When I accelerate, it will hit
around 1100-1200 RPM and growl, then stop once it gets above that, so it's a quick
growl. Only under load, does it do that... My son even told me when he drove it
for the first time he was like "Dad, your car growls.." I said yeah, I know...
I am going to check the motor mounts, and trans mount when I can.
Also, FYI, that manual trans you have is notorious for noise, you can look that up, it's
actually quite common.
It's not the diff, and I changed the oil last month, and what I took out was clean, so I
did not really have to.
10-26-2018, 02:04 PM
#8
1st Gear Member
Thread Starter
Join Date: Dec 2012
Location: MA
Posts: 113
The pulleys/A/C definitely arent related to the problem I am having.. I feel like its driveline related or exhaust.. Because its so drony and loud in the back of the car under load.
10-26-2018, 02:08 PM
#9
1st Gear Member
Thread Starter
Join Date: Dec 2012
Location: MA
Posts: 113
No, sorry, I have a V6 Auto, and it makes that growling noise, and it is being generated
by the motor. As I said, when the A/C is on, it's much worse at idle. Also, in fact, it got
worse when I put new plugs in. Performs better, but growls, and only at idle in gear
with the A/C on, since there is a "load" on the motor. When I accelerate, it will hit
around 1100-1200 RPM and growl, then stop once it gets above that, so it's a quick
growl. Only under load, does it do that... My son even told me when he drove it
for the first time he was like "Dad, your car growls.." I said yeah, I know...
I am going to check the motor mounts, and trans mount when I can.
Also, FYI, that manual trans you have is notorious for noise, you can look that up, it's
actually quite common.
It's not the diff, and I changed the oil last month, and what I took out was clean, so I
did not really have to.
by the motor. As I said, when the A/C is on, it's much worse at idle. Also, in fact, it got
worse when I put new plugs in. Performs better, but growls, and only at idle in gear
with the A/C on, since there is a "load" on the motor. When I accelerate, it will hit
around 1100-1200 RPM and growl, then stop once it gets above that, so it's a quick
growl. Only under load, does it do that... My son even told me when he drove it
for the first time he was like "Dad, your car growls.." I said yeah, I know...
I am going to check the motor mounts, and trans mount when I can.
Also, FYI, that manual trans you have is notorious for noise, you can look that up, it's
actually quite common.
It's not the diff, and I changed the oil last month, and what I took out was clean, so I
did not really have to.
I know all about the TR3650 being noisy... I just didnt think it would carry into the driveline while driving it..?
