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Vibration I can't seem to diagnose

turboneon

Well-known member
Joined
Apr 17, 2015
Messages
49
Location
greenville sc
newbie thread

Hello everyoneveryone! Fist off I've been living my gvr4 but I have put a new aluminum drive shaft, front axles and changed out my front motor mount and can not get this vibration I have gone. It only does it under mild acceleration and seems to be not near as bad at wide open throttle. I have attached the link to my thread in the newbie section but I can not seem to figure this out and I'd like to fix it myself rather than pay who knows what at a shop. If anyone has any input I'd greatly appreciate it!

Thanks !

Jake
 

marvinmadman

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Joined
Nov 10, 2003
Messages
2,355
Location
Lafayette, Louisiana
If the clutch is really slipping, I'd yank that thing out and install a good flywheel/clutch setup to rule that out and fix an existing issue at least.
 

turboneon

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Joined
Apr 17, 2015
Messages
49
Location
greenville sc
I think the main reason the clutch was slipping bad at first was because the car had been sitting for years without being ran. If I pull the Trans I'll probably rebuild it too because the synchros are bad. I guess my main scare is doing all that work and it still vibrates lol
 

marvinmadman

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Nov 10, 2003
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2,355
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Lafayette, Louisiana
I've gotten bad front axles before from a parts store. My damn DD b16 ef sedan would shake between 30-45 no matter what. After 3 axles I got a good pair.
 

strokin4dr

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Aug 30, 2005
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2,770
Location
Savannah, GA
Quoting turboneon:
I think the main reason the clutch was slipping bad at first was because the car had been sitting for years without being ran. If I pull the Trans I'll probably rebuild it too because the synchros are bad. I guess my main scare is doing all that work and it still vibrates lol



I don't see the problem with fixing known issues (slipping clutch and bad synchros) with the possibility of it still vibrating. Those things still need to be addressed anyway, so it would be the right path to getting the car back to where it should be anyway. Hopefully those fixes would help though. Good luck!
 

thomcasey

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Sep 24, 2014
Messages
907
Location
Indianapolis, IN
What king of mount/gromets are you using for the driveshaft/carrier bearings? Are they solid or stock?
 

marvinmadman

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Nov 10, 2003
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2,355
Location
Lafayette, Louisiana
Also, did the shop balance the whole driveshaft and correctly install the u joint snap shims?
 

gtluke

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Joined
Sep 16, 2001
Messages
4,210
Location
dirty jersey
I had an axle that would sometimes shift or something and have a bad vibration.
Make sure the jack shaft is bolted in properly with the correct spacers or AC bracket
Recently my front trans bolt worked it's way out and caused a strange vibration at highway speed.
 

turboneon

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Joined
Apr 17, 2015
Messages
49
Location
greenville sc
The ac bracket is still in tack. I'm assuming the jack shaft is the Trans to driver side front axle extension? Do you have any info on this because I was at a loss as to how to check anything on it.
 

marvinmadman

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Joined
Nov 10, 2003
Messages
2,355
Location
Lafayette, Louisiana
I'm interested in these spacers too. I don't have any and I don't remember what they look like. Last time I removed a half/jack/intermediate shaft was like 10 years ago. My memory isn't all that great with this piece /ubbthreads/images/graemlins/rofl.gif
 

marvinmadman

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Nov 10, 2003
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2,355
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Lafayette, Louisiana
Nevermind. I found the info. 1 spacer is only needed if you don't have the AC bracket installed. The bracket acts as a spacer.
 

turboneon

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Joined
Apr 17, 2015
Messages
49
Location
greenville sc
Anyone know if the intermediate shaft goes bad? Also can I get a new one? I'm so at a loss on this I'm ready to buy cheaper parts to try to get somewhere with this vibration
 

marvinmadman

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Nov 10, 2003
Messages
2,355
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Lafayette, Louisiana
Never seen one go bad. There's a bearing inside it though. Definitely can go bad and would cause a vibration.
 

MegaSuiter

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Joined
Dec 6, 2011
Messages
122
Location
Oscoda, MI
I have used a microphone system before to locate different noises around the car. the one I used had six microphones you can place wherever you want. If you can get your hands on one, try using it to maybe isolate the vibration. Maybe it'll make enough noise to pick it up on a mic?
 

turboneon

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Joined
Apr 17, 2015
Messages
49
Location
greenville sc
I have thought about that but most mechanics here just give up easy when there's a problem like this. I definitely don't want to invest in one but I will see if I can find someone who had one! Anyone know the intermediate shaft part number? Can't seem to find it anywhere.
 

FlyingEagle

Staff member
Joined
Mar 5, 2005
Messages
1,635
Location
THE Ottawa
Also, what is the brand of aluminum driveshaft ? DSS ?

Was it balanced/checked for balance as mentioned before?

It was bolted in but that means nothing, IF, it is still not balanced.

Do you have the original driveshaft setup?

Pop it in, and compare.
 
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