HAMMER KNOCK!

JASonic · May 29th, 2007, 08:16 PM

I have a disturbing sound coming from my car. When Im driving in 3rd, if I let off the gas and coast, sometimes when it downshifts into second, it makes a "bang" sound. Like one kind of loud thump. Like a hammer tapping on a metal pipe is the best way to describe it.

It seems to be shifting fine and theres no other simptoms. Doesnt happen everytime either. It does happen more often when the AC is on.

Just like a bang when it catches 2nd gear.

Could this be a sign of doom for this car? It sounds like its coming from the back.

Any ideas on anything to check or watch out for????

stephen · May 29th, 2007, 08:19 PM

Check the drive shaft for a bad u-joint.

JASonic · May 29th, 2007, 08:27 PM

Shnikies! That sounds expensive and difficult.

Whats the u-joint do? why would it "knock" like that?

Juggalo_X · May 29th, 2007, 08:38 PM

u joints are cheap and i have a bad one too it does the old clunk when going from park to drive they are like 22 bux i have a new one just havnt had the time to pull the drive shaft and replace it.... its so simple a cave man could do it lmao!

JASonic · May 29th, 2007, 09:52 PM

jug- thats great news! Not your clunk but the fact that this confirms that maybe I can handle this.

Is it something I need to replace asap? Or can I leave it alone for awhile? Should I just take it easy on the thing until I can fix it?

How much would a mechanic charge?

SHIT! Sorry Im full of alot of questions... sorry.

chevy_killer · May 29th, 2007, 11:24 PM

Originally Posted by ja002gl

jug- thats great news! Not your clunk but the fact that this confirms that maybe I can handle this.

Is it something I need to replace asap? Or can I leave it alone for awhile? Should I just take it easy on the thing until I can fix it?

How much would a mechanic charge?

SHIT! Sorry Im full of alot of questions... sorry.

it wont take but mabe 30 min to replace them...but it might be your transmission...im just throwing it out there

JASonic · May 29th, 2007, 11:33 PM

this stuff is scary.... I need to have it checked out

chevy_killer · May 29th, 2007, 11:38 PM

im not sure on the transmission....im just taking a gander but...but more than likely its the u joints...they wont take but 15 min each to change out...all you got to do is take out 2 bolts pop the drive shaft out take the u joint out and put a new one in...and do the same for the back

PONYMAN · May 30th, 2007, 01:58 PM

U joints are quite cheap, but if lekft unattended, u joint failure can be real exspenive.
You can tear up your drive shaft & transmission.

May 29th, 2007, 08:16 PM	#1
JASonic The George Forman of Keepers Join Date: Feb 2007 Posts: 2,406 iTrader: 20 reviews	HAMMER KNOCK! I have a disturbing sound coming from my car. When Im driving in 3rd, if I let off the gas and coast, sometimes when it downshifts into second, it makes a "bang" sound. Like one kind of loud thump. Like a hammer tapping on a metal pipe is the best way to describe it. It seems to be shifting fine and theres no other simptoms. Doesnt happen everytime either. It does happen more often when the AC is on. Just like a bang when it catches 2nd gear. Could this be a sign of doom for this car? It sounds like its coming from the back. Any ideas on anything to check or watch out for????

May 29th, 2007, 11:38 PM	#8
chevy_killer Enthusiast 2009 v6 Mustang Join Date: Nov 2006 Location: Winter Haven Florida Posts: 947 iTrader: 0 reviews	im not sure on the transmission....im just taking a gander but...but more than likely its the u joints...they wont take but 15 min each to change out...all you got to do is take out 2 bolts pop the drive shaft out take the u joint out and put a new one in...and do the same for the back __________________ The LS1 was finally subjected to a paternity test, and it's daddy was to '03 Cobra

May 30th, 2007, 01:58 PM	#9
PONYMAN Regular Join Date: Feb 2007 Location: Houston \ Flatonia Texas Posts: 208 iTrader: 0 reviews	U joints are quite cheap, but if lekft unattended, u joint failure can be real exspenive. You can tear up your drive shaft & transmission. __________________ Have you driven a Ford lately ?

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May 29th, 2007, 08:19 PM	#2
stephen Hardcore Enthusiast Join Date: Feb 2007 Posts: 1,181 iTrader: 0 reviews	Check the drive shaft for a bad u-joint.

May 29th, 2007, 08:27 PM	#3
JASonic The George Forman of Keepers Join Date: Feb 2007 Posts: 2,406 iTrader: 20 reviews	Shnikies! That sounds expensive and difficult. Whats the u-joint do? why would it "knock" like that?

May 29th, 2007, 08:38 PM	#4
Juggalo_X I Post Entirely Way Too Much 2001 Mustang 232/CBR600 14+@Slow Join Date: Jan 2007 Location: South Western Ontario Posts: 6,688 iTrader: 0 reviews	u joints are cheap and i have a bad one too it does the old clunk when going from park to drive they are like 22 bux i have a new one just havnt had the time to pull the drive shaft and replace it.... its so simple a cave man could do it lmao!

May 29th, 2007, 09:52 PM	#5
JASonic The George Forman of Keepers Join Date: Feb 2007 Posts: 2,406 iTrader: 20 reviews	jug- thats great news! Not your clunk but the fact that this confirms that maybe I can handle this. Is it something I need to replace asap? Or can I leave it alone for awhile? Should I just take it easy on the thing until I can fix it? How much would a mechanic charge? SHIT! Sorry Im full of alot of questions... sorry.

May 29th, 2007, 11:33 PM	#7
JASonic The George Forman of Keepers Join Date: Feb 2007 Posts: 2,406 iTrader: 20 reviews	this stuff is scary.... I need to have it checked out

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