Clunking sound
#1
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Car: 1986 Camaro IROC-Z
Engine: 350 swap
Transmission: manual
Clunking sound
Hi all,
I have a irocz 1986 with a crate 350 engine with about 100 miles on it and recently rebuilt T5 manual transmission. When I am on low gear and speed about 10 mph, there is clunking sound, like metal to metal, right below the transmission area. It almost feels like the whole transmission and driveshaft are loose and hitting just about anything underneath. I was thinking the transmission mount was loose. I have not It take look at it yet as I would like to know how and where to start. Any suggestion is appreciated.
Thanks.
I have a irocz 1986 with a crate 350 engine with about 100 miles on it and recently rebuilt T5 manual transmission. When I am on low gear and speed about 10 mph, there is clunking sound, like metal to metal, right below the transmission area. It almost feels like the whole transmission and driveshaft are loose and hitting just about anything underneath. I was thinking the transmission mount was loose. I have not It take look at it yet as I would like to know how and where to start. Any suggestion is appreciated.
Thanks.
#2
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Car: 88GTA
Engine: 5.7TPI
Transmission: Auto
Axle/Gears: 3.27
Re: Clunking sound
transmission mount. Put it in gear and try to move forward with the Ebrake on. If you look at the engine and it looks like its gonna roll outta the engine bay(tipping forward, tailshaft raising up against tunnel), you have a bad mount. Check engine mounts too.
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Car: 1986 Camaro IROC-Z
Engine: 350 swap
Transmission: manual
Re: Clunking sound
Yeah, that's what I thought. can the transmission mount seen from underneath the car as well?
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Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: Clunking sound
Usually just looking at the rubber mount from underneath is not enough because the rubber tears away from the steel its mounted to not in half.
When there is pressure on it from the transmission it looks OK. You must place a jack under the trans pan with a large enough piece of wood on it so the jack will not punch through or bend the pan and jack it up a tiny bit and watch the mount. If you see it separate than replace it.
This is a VERY common problem and after tearing a few I went to a "poly mount" instead of rubber.
They are basically made for racing applications.
When there is pressure on it from the transmission it looks OK. You must place a jack under the trans pan with a large enough piece of wood on it so the jack will not punch through or bend the pan and jack it up a tiny bit and watch the mount. If you see it separate than replace it.
This is a VERY common problem and after tearing a few I went to a "poly mount" instead of rubber.
They are basically made for racing applications.
Last edited by Ron U.S.M.C.; 10-21-2017 at 07:40 PM.
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Car: 84 Z-28 Camaro
Engine: 383
Transmission: T-56
Axle/Gears: richmond 3.73, eaton posi
Re: Clunking sound
I second jacking up the back of the tran to check it, when they break the crack/separation is almost invisible unless pressure is applied to it, since you have a 5 speed you should be able to change it just by jacking the back of the trans up, you shouldn't need to remove the crossmember, also look into a poly mount, the ones from energy suspension have interlocking tabs inside of them to keep them from seperating
#11
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Car: 1986 Camaro IROC-Z
Engine: 350 swap
Transmission: manual
Re: Clunking sound
The transmission mounts were fine. Like shayne said, the torque arm bushing was not there. Apparently the previous owner tried to weld everything together.
I thought a follow up would be good.
I thought a follow up would be good.
#12
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Re: Clunking sound
Energy Suspension makes solid poly replacement bushings, just drill out the rivets on the clamshell mount (if the PO didn't already). Make sure to get the correct bushing for your mount, the "lips" on the torque arm can face either the driver side or passenger, resulting in a W or M shape, depending on how it's oriented.