trying to find a clunking noise
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Joined: Apr 2003
Posts: 664
From: long island N.Y.
trying to find a clunking noise
ok ive been chasing down a clunking noise abut 2 months after i did my 12 bolt
symptoms: 1: very loud clunk/ bang when i nail the gas (any rpm any mph but not from a stop) sounds like its comming from the center or rear of car
2: clunking just when i go into O.D. in between 40- 50 but when i tap the brake while hitting the gas to get out of lock up, its gone. souds like its coming from the rear of the car
how long: the first symptom happend im guessing arond after i had my tranny built with a new 3200 stall converter.
the second symptom has been happening about 2 months after i had a moser 12 bolt installed before and after the trans was built ( i did the tranny after the 12 bolt)
what has been checked/ replaced: new poly trans mount, T/A mount, all bushings in rear to poly, new lakewood lca's, periodicly checking T/A mount on the 12 bolt, ls1 D/S w/ new u joints, new/ upgraded flexplate, exhaust is clearing everything too
what has NOT been checked/ replaced: motor mounts front end bushings shocks and springs, rear gears after or before install of 12 bolt
only thing i can think of is the backlash on the rear or slack on it but im not sure how to check it, its a moser 12 bolt 3:91 gears and a detroit true track diff 33 spline axles and upgraded 1350 series yoke
sorry for the long post but any help would be great
symptoms: 1: very loud clunk/ bang when i nail the gas (any rpm any mph but not from a stop) sounds like its comming from the center or rear of car
2: clunking just when i go into O.D. in between 40- 50 but when i tap the brake while hitting the gas to get out of lock up, its gone. souds like its coming from the rear of the car
how long: the first symptom happend im guessing arond after i had my tranny built with a new 3200 stall converter.
the second symptom has been happening about 2 months after i had a moser 12 bolt installed before and after the trans was built ( i did the tranny after the 12 bolt)
what has been checked/ replaced: new poly trans mount, T/A mount, all bushings in rear to poly, new lakewood lca's, periodicly checking T/A mount on the 12 bolt, ls1 D/S w/ new u joints, new/ upgraded flexplate, exhaust is clearing everything too
what has NOT been checked/ replaced: motor mounts front end bushings shocks and springs, rear gears after or before install of 12 bolt
only thing i can think of is the backlash on the rear or slack on it but im not sure how to check it, its a moser 12 bolt 3:91 gears and a detroit true track diff 33 spline axles and upgraded 1350 series yoke
sorry for the long post but any help would be great
Last edited by red 95 z28 lt1; Oct 8, 2006 at 02:44 AM.
Thread Starter
Registered User
Joined: Apr 2003
Posts: 664
From: long island N.Y.
Re: trying to find a clunking noise
update:
still getting the chatter but from doing reserch i think its the tcc. for some reason when i tap the brake in od it goes away, had my drive shaft shortened and its still the same, im also now getting the chatter at higher speeds (like 65- 75mph)but not as harsh. its harsh around 40 to 50mph to a point where its banging bad and shaking the whole car kind of like a broken mount, its more of a bad and violent chatter then clunking, also its not rpm related, my friend told me if i put the stock converter back in the car it may go away, but i was wondering if i can find this problem on a dyno with the pcm being programmed and checking all the sensors.
Please help i cant take it anymore, has anyone else had a problem like this with a 2800 or higher stall?
Thanks --frank--
still getting the chatter but from doing reserch i think its the tcc. for some reason when i tap the brake in od it goes away, had my drive shaft shortened and its still the same, im also now getting the chatter at higher speeds (like 65- 75mph)but not as harsh. its harsh around 40 to 50mph to a point where its banging bad and shaking the whole car kind of like a broken mount, its more of a bad and violent chatter then clunking, also its not rpm related, my friend told me if i put the stock converter back in the car it may go away, but i was wondering if i can find this problem on a dyno with the pcm being programmed and checking all the sensors.
Please help i cant take it anymore, has anyone else had a problem like this with a 2800 or higher stall?
Thanks --frank--
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