HELP!! BAD clunk from under the car!!!
#1
Junior Member
Thread Starter
Join Date: Dec 2002
Location: Medford, Oregon
Posts: 25
Likes: 0
Received 0 Likes
on
0 Posts
HELP!! BAD clunk from under the car!!!
Whenever I start from a dead stop there is a nasty clunk coming from under the car like something is hitting the floor HARD. I can feel it through the seat and steering wheel. only happens from a dead stop with half throttle or more. Does anybody have any ideas about what this is or how to fix it? It just started doing this yesterday. It feels like it's coming from just behind the seats uhnder the center console.
1990 pontiac firebird formula 305tbi 700r4
1990 pontiac firebird formula 305tbi 700r4
#2
Supreme Member
Probably a broken transmission mount. It takes about 30 minutes to fix and will cost you about $10 if you do it yourself. Couldn't cost more than $60 bucks for a shop to replace it.
Edit. Some people will tell you to put a polyurethane one in so it doesn't break in the future. Do a search to find out about it.
Edit. Some people will tell you to put a polyurethane one in so it doesn't break in the future. Do a search to find out about it.
#4
Senior Member
Join Date: Oct 2002
Location: Herrin IL
Posts: 694
Likes: 0
Received 0 Likes
on
0 Posts
Car: 98 Trans Am 85 Trans Am
Engine: LS1 Lg4
Transmission: 4L60E 700r4
Axle/Gears: 3.23 2.73
I have to say tranny mount as well I have replaced one on every thirdgen I have owned but all of them had well over 100k and it was the original round mount not the square replacemnts that I removed.
#5
Supreme Member
ur not an official thirdgen owner until u have the tranny mount go out and wonder what the heck that sound is, and replace it with an Energy Suspension mount only to be pissed off at the vibration.
welcome to the club! and Thirdgen.org
welcome to the club! and Thirdgen.org
#6
TGO Supporter
Trending Topics
#8
Senior Member
Join Date: Oct 2002
Location: Santa Ana CA
Posts: 980
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 GTA
Engine: 350 tPI
Transmission: 700r4
Axle/Gears: 342
That happened to me too a few months ago, after I was...uh... Anyway, is this a recurring problem, I mean, does it happen alot, or was it an age thing? (mostly newbie)
#9
TGO Supporter
julie, yes it's a problem that is going to happen over and over untill you replace it with a poly mount from ES. gm did everything they could to make sure the mounts break from time to time.
#10
Supreme Member
Join Date: Jul 1999
Location: Loveland, OH, US
Posts: 18,457
Likes: 0
Received 15 Likes
on
15 Posts
Car: 4
Engine: 6
Transmission: 5
That's not a BAD clunk, that's a GOOD clunk.
That stupid blob of spooge mount with no reinforcement always breaks. It's probably been broken for a long time, it just wasn't completely into 2 pieces like it is now, to where the trans and drive shaft hit the botom of the car.
Get an Energy Suspension poly one and never worry about it again.
That stupid blob of spooge mount with no reinforcement always breaks. It's probably been broken for a long time, it just wasn't completely into 2 pieces like it is now, to where the trans and drive shaft hit the botom of the car.
Get an Energy Suspension poly one and never worry about it again.
#11
Supreme Member
iTrader: (2)
Join Date: Jul 2001
Location: San Antonio, TX
Posts: 1,823
Likes: 0
Received 1 Like
on
1 Post
Car: 1988 IROC-Z
Engine: L98 (350 TPI)
Transmission: MD8 (700 R4) + 3.42 LS1 Rear
believe or not autozone now stocks alot of ES stuff. ie tranny mounts, motors mounts, and sway bar bushings.
#12
Supreme Member
Join Date: Sep 2002
Location: Toronto
Posts: 1,661
Likes: 0
Received 0 Likes
on
0 Posts
lol sucks hu just went through that on my car a week ago. i went and got the new mounts but when i brought it to the shop they where fine, its just the bolts where like half out thats holding the tranny, i would check that first.
#14
Supreme Member
iTrader: (1)
Join Date: Feb 2000
Location: Norfolk, VA. USA
Posts: 7,964
Likes: 0
Received 3 Likes
on
3 Posts
Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
I had the same problem with my 305 5 speed.
Took some friends for a ride and got on it and loud CLUNK from the bottom of the car and the shifter would move up and down about 2-4 inches.
Stock replacement from Advance Auto tore in half less than 500ft from my house.
Motor died shortly after.
Took some friends for a ride and got on it and loud CLUNK from the bottom of the car and the shifter would move up and down about 2-4 inches.
Stock replacement from Advance Auto tore in half less than 500ft from my house.
Motor died shortly after.
Thread
Thread Starter
Forum
Replies
Last Post
1992 Trans Am
Engine/Drivetrain/Suspension Parts for Sale
1
08-08-2015 08:16 PM