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  #1  
Old July 11th, 2013, 07:47 PM
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Small or Big Problem

Noticed a rattling noise coming from the bottom of my Defender today... At first I thought it was coming from the exhaust, but it's coming from the front of the transmission... Is it hard to replace transmissions in NAS Defenders? We have several older Discoveries laying around... Could I retrofit one of the automatic transmissions from one of those?
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  #2  
Old July 11th, 2013, 07:56 PM
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Does it sound like a golf ball in a Tin can?
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Old July 11th, 2013, 07:56 PM
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Quote:
Originally Posted by WD90 View Post
Noticed a rattling noise coming from the bottom of my Defender today... At first I thought it was coming from the exhaust, but it's coming from the front of the transmission... Is it hard to replace transmissions in NAS Defenders? We have several older Discoveries laying around... Could I retrofit one of the automatic transmissions from one of those?
rattling could be so many things, why jump to most expensive so quickly? could be linkages, or cats, or heat shields, loose washers, etc
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  #4  
Old July 11th, 2013, 08:00 PM
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Just preparing for the worst... Service guys are going to check it out tomorrow. Just want to know some solutions ahead of time if the transmission is about to explode.

The sound is coming from the exhaust unfortunately... It's at the front of the transmission. Yes, sounds like a golf ball rattling in a can... No change in/out of gear
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  #5  
Old July 11th, 2013, 08:29 PM
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I am willing to bet it is the catalytic converter, mine is making the same noise, and I need to get it replaced. I am going to buy just the Y section needed and it runs around $400. I don't think the tranny would make that noise unless you were getting some other more serious symptoms.
Take something and bang on your converter under your driver side, might move that loose piece around enough to stop some noise.
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  #6  
Old July 11th, 2013, 08:46 PM
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trannies make a knocking, not a rattling sound when going bad.

sounds like you have a classic bad cat. if i were you, I wouldn't tell the mechanic a thing other than you hear rattling. I'm sure he would love to sell you a tranny replacement if you opened the door for him.
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  #7  
Old July 11th, 2013, 09:10 PM
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I hope you're right... They're my service guys, so they better be good to me!
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  #8  
Old July 11th, 2013, 09:16 PM
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if the cat is bad, you can bang on the cat and hear it rattling inside where the matrix has come apart. You should also be smelling the rotten eggs by now.
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  #9  
Old July 11th, 2013, 09:36 PM
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No smell yet, but I'll beat it with a hammer tomorrow and see what happens
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  #10  
Old July 12th, 2013, 09:47 AM
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William Skidmore
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Bad cats can also make your engine get hotter over time.
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  #11  
Old July 12th, 2013, 10:04 AM
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The guys are telling me that it's the cats... I have a guy up the road that will straight pipe it for about $50.00...
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  #12  
Old July 12th, 2013, 10:45 AM
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Why not get a new y pipe? They don't like running without cats.
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  #13  
Old July 12th, 2013, 10:52 AM
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Cut them out and have magnaflows installed.
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  #14  
Old July 12th, 2013, 11:01 AM
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The 3.9 runs great without cats.
You may not like the extra rumble or hollow tone it produces.

The easy method is to just drop the y-pipe cut open the cats and clean out all the filter/honeycomb material.
You'll probably find yours is alread broken into pieces.

The more involved method is to remove the cats and weld in straight pipe(which cuts down on the resonance).

Determine first if this is the source of your noise.
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  #15  
Old July 12th, 2013, 11:37 AM
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Quote:
Originally Posted by Nomar View Post
The 3.9 runs great without cats.
You may not like the extra rumble or hollow tone it produces.

The easy method is to just drop the y-pipe cut open the cats and clean out all the filter/honeycomb material.
You'll probably find yours is alread broken into pieces.

The more involved method is to remove the cats and weld in straight pipe(which cuts down on the resonance).

Determine first if this is the source of your noise.
My service manager is 99.9% sure that it's the drivers side cat...

The PO had a Flowmaster muffler installed, and it already has a growl... I'm curious to see how it sounds without the cats. I am worried how the engine will perform without them... guess we'll find out.
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  #16  
Old July 12th, 2013, 11:44 AM
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A thermal IR gun will confirm the blocked cat in 30 seconds. Measure the inlet and exit temps of both cats to compare.
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  #17  
Old July 12th, 2013, 12:37 PM
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Not having those cats via straight piping it can be a problem in some states with emissions inspections (not in NC, but some places).
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  #18  
Old September 4th, 2013, 10:46 PM
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John Oates
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I cut out my cats and it runs fine, but you're right...I barely squeaked by inspection this year
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  #19  
Old September 5th, 2013, 08:29 AM
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Doug Crowther
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Quote:
Originally Posted by WD90 View Post
My service manager is 99.9% sure that it's the drivers side cat...

The PO had a Flowmaster muffler installed, and it already has a growl... I'm curious to see how it sounds without the cats. I am worried how the engine will perform without them... guess we'll find out.
worried how the engine will perform without cats ? The engine will perform much better, its the environment that the cats protect not the truck.
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  #20  
Old September 5th, 2013, 10:20 AM
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If you happen to get busted by the inspector then you'll have to replace it properly anyhow. If a state trooper just happens to be around at that time you could be looking at serious $$$ penalties. The EPA and DOT love busting on this stuff. Seriously, it's just an anemic LR 3.9 so gutting the cats isn't going to make huge power gains. You can replace with a new y-pipe which should increase exhaust flow by default. Alternately, you could fit aftermarket small hi-flow cats to decrease backpressure. Fix it right and be done with it.
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