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Unread 11-13-2009   #1 (permalink)
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Default Vibration issues on 1987 Mustang 5.0

Hello everyone!
I'm having some vibration issues when accelerating hard and it worsens as the rpm's get higher. Most the vibration feels like it's coming thru the shifter and causes it to raddle. It seems to run smooth at normal driving. I had the drive shaft completely redone with a new yoke,universal joints and balanced. I even replaced the steel sleeve in the transmission tail housing. I welcome any suggestions!

Brandon
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Unread 11-14-2009   #2 (permalink)
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dumb question, but is your tranny good on fluid?
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Unread 11-14-2009   #3 (permalink)
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Yeah, It's full. I did install a B&M short shifter here recently and I'm not sure if that has something to do with it?
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Unread 11-14-2009   #4 (permalink)
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well did you start noticing the noise after you installed the shifter? Your T5 synchros or gears might be getting worn. How many miles on the transmission?
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Unread 11-14-2009   #5 (permalink)
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Just curious but how is your trans mount?
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Unread 11-14-2009   #6 (permalink)
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im having the same problem right now. rattle in the shifter and everything. i think its either something out of balance or a mount. the way mine feels i think its a balance problem. im gona try getting my harmonic balancer re-balanced. after i do a good check of my trans/motor mounts
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Unread 11-14-2009   #7 (permalink)
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this might be a dumb idea, but have you had your tires balanced? this sounds very much like what my brothers car was doing untill he had the tires balanced.
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Unread 11-14-2009   #8 (permalink)
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The tranny has around 100,000 on it and the mount is probably the original but it looks fine. I guess I could put a new one on and see what it does. As far as the tires, they should be fine. I don't recall it vibrating like that with the original shifter, but I'm not sure.
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Unread 11-15-2009   #9 (permalink)
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i had the same problem, drive shaft was replace with new aluminum, new joint, rear suspension was redone with southside, new trans and mounts and it still did the samething and then i sold the car, the rims/tires were balanced but it still vibrated at higher speeds. never figured out the problem.... sorry
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Unread 11-17-2009   #10 (permalink)
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Quote:
Originally Posted by Erjan View Post
i had the same problem, drive shaft was replace with new aluminum, new joint, rear suspension was redone with southside, new trans and mounts and it still did the samething and then i sold the car, the rims/tires were balanced but it still vibrated at higher speeds. never figured out the problem.... sorry
its has to be a balance problem somewhere. my guess being harmonic balancer or flywheel. but...

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this might be a dumb idea, but have you had your tires balanced? this sounds very much like what my brothers car was doing untill he had the tires balanced.
this makes me think because i do have a suspension problem in the front. feels like it might be a ball joint and if balancing the tires worked for your brother, this might be the source of the problem
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Unread 11-17-2009   #11 (permalink)
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have you checked play in your high millage rear-end.thats my vibration and its in shifter.
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Unread 11-18-2009   #12 (permalink)
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Quote:
Originally Posted by 95gts silver/bl View Post
have you checked play in your high millage rear-end.thats my vibration and its in shifter.
Not too many miles on my rear and it does it if I rev it in neutral
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Unread 11-18-2009   #13 (permalink)
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Sound like mounts if it does it in nuetral or shifter isnt fastened down tight. Or you shifted that new shifter hard and did something to the clutch but the clutch and harmonic should be a constant vibe worse w/ high rpms not normal off load.
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Unread 11-19-2009   #14 (permalink)
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mine is doing the same thing I just replaced my driveshaft and did a complete re-build of the front end and it still vibrates very badly when you get on it but will drive fine with normal accel. Mine goes away the second I push the clutch in I think it is time for a new clutch and flywheel set-up
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Unread 11-19-2009   #15 (permalink)
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Here is my (educated?) guess... I had the same problem after I installed my new 347, new FRP aluminum drive shaft, and new Centeforce clutch. This vibration that started at about 3000RPM. Drove me nuts. The engine parts were supposed to have been ballanced. However.... I took the engine back out and took all of the rotating parts to a different ballancing shop and spent the $200 bucks to have it done again. Wha La... no more vibrations. All this to say that I suspect that you have something out of ballance up front. Harmonic ballancers can cause this problem especially the ones that have a rubber isolation spacer. The outer ring slips, rotates out of positon, and causes the imballance. I would first of all replace the harmonic ballancer. You are not going to feel the vibration if is tires or any other moving part if you are sitting still in neutral. Hope this helps.
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