Rythmic thump after hard acceleration
Fleet Mechanic
Joined: Jul 2010
Posts: 1,753
Likes: 34
From: Los Angeles, Ca.
Typical signs that your Rockwell Retroencabulator took a dump. Just google the part name and it should become very clear what you need to do.
But in case it's not that; does the noise start right from 0 MPH as you're accelerating or is there a specific speed where it starts? Does it go away above a certain speed? Does it go away when you let off the power regardless of speed? Meh, forget all that. It's the retroencabulator and your truck is done, drop it off at my house and I'll get you an uber to the airport.
Damn, my 4th rum & coke evaporated again. Or maybe 5th? Regardless, it's time to refill.
But in case it's not that; does the noise start right from 0 MPH as you're accelerating or is there a specific speed where it starts? Does it go away above a certain speed? Does it go away when you let off the power regardless of speed? Meh, forget all that. It's the retroencabulator and your truck is done, drop it off at my house and I'll get you an uber to the airport.
Damn, my 4th rum & coke evaporated again. Or maybe 5th? Regardless, it's time to refill.
Thread Starter
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FTE Chapter Leader
Joined: Jan 2005
Posts: 13,110
Likes: 4,715
From: Henderson, NV
'88 E-350, actually it's only the E99s that came with the Retroencabulator. The 2000s and up came with the Turboencabulator which had all sheetmetal removed from the design. In any case, my Turboencabulator has been removed for weight savings.
The noise does not occur until I hit 30mph. It is pretty consistent in this respect. It occurs whenever engine torque is applied to the rear wheels up to 60mph which is as fast as I dared to go one time. The noise goes away immediately when engine torque is relieved at any speed.
A stiff drink sounds good about now.
The noise does not occur until I hit 30mph. It is pretty consistent in this respect. It occurs whenever engine torque is applied to the rear wheels up to 60mph which is as fast as I dared to go one time. The noise goes away immediately when engine torque is relieved at any speed.
A stiff drink sounds good about now.
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,351
Likes: 5,945
From: Lake Hartwell, GA
What about the down pipe hitting the firewall, transmission, heat shield just as the exhaust goes horizontal?
I say this because it would be very difficult to detect when the truck is sitting still because it would look like there is clearance. Put torque to the engine and the down pipe would move and flex differently than the rest of the exhaust, engine and what not. Although, I would guess this would happen at all speeds, but I have seen stranger problems when dealing with tactical communications equipment that I still have zero explanation for.
I say this because it would be very difficult to detect when the truck is sitting still because it would look like there is clearance. Put torque to the engine and the down pipe would move and flex differently than the rest of the exhaust, engine and what not. Although, I would guess this would happen at all speeds, but I have seen stranger problems when dealing with tactical communications equipment that I still have zero explanation for.
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FTE Chapter Leader
Joined: Jan 2005
Posts: 13,110
Likes: 4,715
From: Henderson, NV
Yup, checked that. I had my wife step on the brakes hard while torqueing the driveline in Drive as a watched the downpipe flex. No contact was made. You do NOT want to know where I was positioned to make this observation with the truck in Drive.
Lead Driver
Joined: Jul 2003
Posts: 7,404
Likes: 52
From: Wheatland, Mo
Have someone give you a hand for the safety side of it but put the truck up on 4 jack stands, heavy ones, and run the truck in low speeds. If you still hear the thumping maybe you can get it pinpointed from the outside walking around it.
Sometimes tough to tell from inside the cab. I had an odd sound that I swear was on the front driver's side until I had someone else drive and I went from window to window to narrow down the location.
Or maybe take it to a speed shop and use their dyno for the same reason.
Sometimes tough to tell from inside the cab. I had an odd sound that I swear was on the front driver's side until I had someone else drive and I went from window to window to narrow down the location.
Or maybe take it to a speed shop and use their dyno for the same reason.
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FTE Chapter Leader
Joined: Jan 2005
Posts: 13,110
Likes: 4,715
From: Henderson, NV
This isn't the first time I have broken a ring and pinion. I had a shop put the TrueTrac with a new ring and pinion in the last time. I'm going to do it myself this time to make sure it gets done right.