Help, tranny noise on WOT

cchris1109 · 12-31-2005, 06:10 PM

ok I will be brief. 94 LT1 Trans Am Auto

at full throttle my car will clunk *like the sound of one running over a rock and hitting the car* and it only occurs during full throttle.

checked tranny fluid, and added a quart, it looks fine, full

car has been sitting for a while so i dunno...

it was running fine yesterday no idea what is up with it...

hopefully nothing expensive and just low on fluid *god i hope so*

thinking it could be the clutch in the tranny, cant handle high revs higher performance shifting and also if i do it hard enough, i can smell a burning smell

oneBADDz · 12-31-2005, 06:59 PM

Transmission mount?

cchris1109 · 12-31-2005, 07:00 PM

it could be,

i put abuot 7 gallons of 87 in it today *the car is new to me*

and i put in a full tank of 91 yesterday *been driving it around a lot*

couldd be that it was knocking and retarding timing but i could feel it underneith me,

guess time will tell eh?

and it has been sitting for like a month or longer, could be old tranny mount, u joints

oneBADDz · 12-31-2005, 07:14 PM

LT1 autos are notorious for the tranny mount, I'd look there first. I wouldn't blame the gas

dexcool · 01-01-2006, 02:48 AM

If its not the mount, slip that drive shaft out and check your ujoints, it could also be some rust on the yoke hanging up, so be sure and emory cloth the rust off and lube the outside and the internal splines before reinstalling it, failing that i'd park it on an alignment rack or over an oil pit and have someone load it up with a second person underneith try and isolate where the noise is coming from. this way if its in the suspension or something goofy, the suspension is at driving height. Whats about your exhaust system? could it be hitting something when the driveline rocks?

cchris1109 · 01-01-2006, 11:40 PM

pretty sure now its the u joints

am goign to autozone tomorrow and try and fix it

crimking · 01-04-2006, 10:24 PM

Hey Chris, what was the final solution?

cchris1109 · 01-05-2006, 08:51 AM

tranny mount was in 2 pieces haha

oneBADDz · 01-05-2006, 10:01 AM

Sweeeeeeeeeet! I win, and you got out with minimal work and for under 20 bucks

cchris1109 · 01-05-2006, 10:02 AM

lol yeah you win now im doing al ot of this

12-31-2005, 06:10 PM	#1
cchris1109 Junior Member Join Date: Dec 2005 Age: 24 Posts: 18	Help, tranny noise on WOT ok I will be brief. 94 LT1 Trans Am Auto at full throttle my car will clunk like the sound of one running over a rock and hitting the car and it only occurs during full throttle. checked tranny fluid, and added a quart, it looks fine, full car has been sitting for a while so i dunno... it was running fine yesterday no idea what is up with it... hopefully nothing expensive and just low on fluid god i hope so thinking it could be the clutch in the tranny, cant handle high revs higher performance shifting and also if i do it hard enough, i can smell a burning smell Last edited by cchris1109; 12-31-2005 at 06:15 PM.

01-04-2006, 10:24 PM	#7
crimking Junior Member Join Date: Jan 2006 Location: Justin, TX Age: 33 Posts: 19 2002 Z28 Sunset Orange	Having the same problem. Hey Chris, what was the final solution?

12-31-2005, 06:59 PM	#2
oneBADDz SUPREME member-oderator Join Date: Nov 2005 Location: Lost in Texas Age: 27 Posts: 2,682 99 B4C Custom Slate Blue	Transmission mount?

12-31-2005, 07:00 PM	#3
cchris1109 Junior Member Join Date: Dec 2005 Age: 24 Posts: 18	it could be, i put abuot 7 gallons of 87 in it today the car is new to me and i put in a full tank of 91 yesterday been driving it around a lot couldd be that it was knocking and retarding timing but i could feel it underneith me, guess time will tell eh? and it has been sitting for like a month or longer, could be old tranny mount, u joints

12-31-2005, 07:14 PM	#4
oneBADDz SUPREME member-oderator Join Date: Nov 2005 Location: Lost in Texas Age: 27 Posts: 2,682 99 B4C Custom Slate Blue	LT1 autos are notorious for the tranny mount, I'd look there first. I wouldn't blame the gas

01-01-2006, 02:48 AM	#5
dexcool Junior Member Join Date: Jan 2006 Location: Canada Age: 37 Posts: 18 2002 ss black	If its not the mount, slip that drive shaft out and check your ujoints, it could also be some rust on the yoke hanging up, so be sure and emory cloth the rust off and lube the outside and the internal splines before reinstalling it, failing that i'd park it on an alignment rack or over an oil pit and have someone load it up with a second person underneith try and isolate where the noise is coming from. this way if its in the suspension or something goofy, the suspension is at driving height. Whats about your exhaust system? could it be hitting something when the driveline rocks?

01-01-2006, 11:40 PM	#6
cchris1109 Junior Member Join Date: Dec 2005 Age: 24 Posts: 18	pretty sure now its the u joints am goign to autozone tomorrow and try and fix it

01-05-2006, 08:51 AM	#8
cchris1109 Junior Member Join Date: Dec 2005 Age: 24 Posts: 18	tranny mount was in 2 pieces haha

01-05-2006, 10:01 AM	#9
oneBADDz SUPREME member-oderator Join Date: Nov 2005 Location: Lost in Texas Age: 27 Posts: 2,682 99 B4C Custom Slate Blue	Sweeeeeeeeeet! I win, and you got out with minimal work and for under 20 bucks

01-05-2006, 10:02 AM	#10
cchris1109 Junior Member Join Date: Dec 2005 Age: 24 Posts: 18	lol yeah you win now im doing al ot of this