Whomp Whomp Whomp noise?

Tony 69

Well-Known Member
Local time
5:41 PM
Joined
Jan 6, 2022
Messages
92
Reaction score
60
Location
North Carolina
So what exactly do you mean? I hear your statement but can’t come to a conclusion
 

Cranky

Banned Henchman #27
Staff member
FBBO Gold Member
Local time
4:41 PM
Joined
Dec 4, 2009
Messages
29,017
Reaction score
30,633
Location
Down southeast Taxas
So what exactly do you mean? I hear your statement but can’t come to a conclusion
Lets say you are cruising at 3000 rpm in high gear doing 60 mph. Down shift to 2nd but keep your speed at 60. The drive shaft will still be turning 3000 rpm but the engine will now be around 5200. The output shaft of the transmission will still be at 3000 and the input shaft of the trans will be at 5200 if there's no slip in the converter or clutch. The transmission dictates engine rpm. Does that make better sense?
 

Big Bad Dad

FBBO Gold Member
FBBO Gold Member
Local time
5:41 PM
Joined
Jun 11, 2011
Messages
4,265
Reaction score
8,537
Location
Fincastle, Va.
This does not concern you? >"It moves up and down a little but I can’t measure it. "
I would think it shouldn't have any movement there. Sounds like your bushing is worn out. The new seal is flexible...
 

kiwigtx

Henchman #4
Staff member
FBBO Gold Member
Local time
11:41 AM
Joined
Jun 12, 2012
Messages
28,781
Reaction score
67,025
Location
NZ - just short of the South Pole
And (before everyone goes nuts) the ties are old. Embarrassing 2011. The car sat a long time.
I'm still leaning towards flat spots on the tires.....that happens to me if I don't move my truck for several months at a time......problem goes away after a good blast down the road.
 

Cranky

Banned Henchman #27
Staff member
FBBO Gold Member
Local time
4:41 PM
Joined
Dec 4, 2009
Messages
29,017
Reaction score
30,633
Location
Down southeast Taxas
I'm still leaning towards flat spots on the tires.....that happens to me if I don't move my truck for several months at a time......problem goes away after a good blast down the road.
I used to get flat spots on my old 3/4 ton truck when it sat for a bit but at 60 mph it was more like a shake, rattle and roll thing but more shaking and rattles than rolling lol. Man, I hated those tires.
 

sam dupont

Well-Known Member
Local time
3:41 PM
Joined
Nov 9, 2020
Messages
1,666
Reaction score
2,500
Location
USA
Get new tires and shocks. I know it's not the shocks, but new tires and shocks makes them ride nice again. Whomp might be your warning. Tire failure at highway speeds can be bad, even in the rear.
This does not concern you? >"It moves up and down a little but I can’t measure it. "
I would think it shouldn't have any movement there. Sounds like your bushing is worn out. The new seal is flexible...
I was looking for a leaky seal as a sign of a worn bushing and didn't think about it being new. I wonder if there is some fluid trapped inside of that new seal.
 

Tony 69

Well-Known Member
Local time
5:41 PM
Joined
Jan 6, 2022
Messages
92
Reaction score
60
Location
North Carolina
Hmm I know 3 beers didn’t get me this dumb. Still thinking about it. I see what Cranky says now. But if the noise is 60-80 in third, why not 40-50 in second or 30-20 in first?
 

Tony 69

Well-Known Member
Local time
5:41 PM
Joined
Jan 6, 2022
Messages
92
Reaction score
60
Location
North Carolina
Ok
The plan is tires first. How will a taller tire affect my car? Besides the speedometer? Where do you buy them?
 

69Bee

FBBO Gold Member
FBBO Gold Member
Local time
3:41 PM
Joined
Nov 17, 2009
Messages
3,973
Reaction score
3,732
Location
Whetstone, AZ
IMG_1036 (2).jpg
 

Virg464

Well-Known Member
Local time
5:41 PM
Joined
Jun 17, 2021
Messages
279
Reaction score
143
Location
Mid Michigan
Hi members. I’m sure describing a noise on a post isn’t going to go to well but I will try anyway. I have a whomp whomp noise between 60-80. It doesn’t change “that much” whether on/off the throttle. But it gets loud and very rhythmic. Almost sounds like something is going to break. There is no vibration, just whomp whomp whomp. As far as I can tell everything is tight. New u joints and a yoke too that was worn out. No tail shaft seal leaking. Can my engine cause this? I have an oe balancer but don’t know about the internals of the engine. I see some 440 were externally balanced and some not.
Should I try a fluidamper balancer. It’s an expensive guess. Unfortunately the noise kinda fills the car so I’m not sure where it’s coming from. Thanks for your suggestions.
I've never experienced it, but was told that if you run an internal bal damper on a external bal engine it will shake so bad you might not even be able to drive it. So, there's that.
 

Photon440

FBBO Gold Member
FBBO Gold Member
Local time
2:41 PM
Joined
Mar 14, 2012
Messages
14,233
Reaction score
19,059
Location
Surrey, B.C. Canada
Hi members. I’m sure describing a noise on a post isn’t going to go to well but I will try anyway. I have a whomp whomp noise between 60-80. It doesn’t change “that much” whether on/off the throttle. But it gets loud and very rhythmic. Almost sounds like something is going to break. There is no vibration, just whomp whomp whomp. As far as I can tell everything is tight. New u joints and a yoke too that was worn out. No tail shaft seal leaking. Can my engine cause this? I have an oe balancer but don’t know about the internals of the engine. I see some 440 were externally balanced and some not.
Should I try a fluidamper balancer. It’s an expensive guess. Unfortunately the noise kinda fills the car so I’m not sure where it’s coming from. Thanks for your suggestions.
While the car is displaying these symptoms, try putting the transmission in neutral with no throttle. If the noise persists, it isn't the engine.
 

Cranky

Banned Henchman #27
Staff member
FBBO Gold Member
Local time
4:41 PM
Joined
Dec 4, 2009
Messages
29,017
Reaction score
30,633
Location
Down southeast Taxas
Hmm I know 3 beers didn’t get me this dumb. Still thinking about it. I see what Cranky says now. But if the noise is 60-80 in third, why not 40-50 in second or 30-20 in first?
If it was to do that it would make me look at the engine for the vibration or noise....
 

Cranky

Banned Henchman #27
Staff member
FBBO Gold Member
Local time
4:41 PM
Joined
Dec 4, 2009
Messages
29,017
Reaction score
30,633
Location
Down southeast Taxas
I've never experienced it, but was told that if you run an internal bal damper on a external bal engine it will shake so bad you might not even be able to drive it. So, there's that.
I've never done that before but did put a 360 converter on a 318 one time. I was able to drive the car but it sure shook pretty good. Wouldn't think a balancer would make it shake any worse than that converter did lol
 

PlymCrazy

FBBO Gold Member
FBBO Gold Member
Local time
5:41 PM
Joined
Mar 19, 2021
Messages
1,334
Reaction score
2,811
Location
Western NY
Flat spots on my tires after sitting for a few months I can feel, not just hear. Takes a few miles to drive it out of them. My Firestone F70-14 redlines are the biggest culprits. My BFGs seem to be immune to flat spots…so far.
 

SlinktRR

Well-Known Member
Local time
5:41 PM
Joined
Aug 27, 2012
Messages
1,278
Reaction score
673
Location
Dallas TX
Check your rear axle bearings. That happened to me last year, whomp whomp sounded like the driveshaft was going to come up through the floorpan. It was the drivers side bearing. Hard to pinpoint by sound.
 
Top