Christine

Hi Guys,

Does anyone know why a 89 'stang would vibrate only when it hits 3000rpm, like a vibration in the shifter area. I've taken it to 3 mechanics and none of them were able to tell me. Please Help!!

99saleen351r

In every gear or just one??Could be U joints.Is it the car shaking or the shifter or what????

Pure5.0

It could be many things contributing to the vibrations. I will list the things that I know could cause it to vibrate:

1. Motor mount/tranny mounts shot
2. Crank damper is bad
3. Crank could be walking
4. Poor running engine at that RPM causing a unbalanced condition (cause from fuel/electrical)
5. Bubble on any one (if not more) of your tires
6. Bent rear axle(s)
7. Driveshaft joints bad

There are other things too, but those are the only things that I find that could be the problem. I would check number 5 first, then 1, 2, and 6 next. The rest are rare.

P.S.I.cho

too add a number to pure 5.0

8) driveshaft is off balance

wafrodon

How bad is the vibration? If you are used to a FWD car or maybe just something less powerful or if it is just a new car for you it will feel different. I was used to driving a Honda 5 speed before I got my mustang and I was worried for a while because the shifter feels completely different but just like all RWD sports cars do. If the vibration is something very bad or just started to happen then it is probably something mentioned.

Grandmaster

mine does that exact same $hit at 4000 though. Mechanic told me it wwas the transmission mounts. makes sense it doesnt shake with the clutch pushed in.

Tims 88GT

mine dose the same thing it is most a 3k, but it is still their all the way to red line, i looked and i broke the right side motor mount, oops lol life goes on, but i would check mounts first, look at your motor mounts good they might look ok at the top but could be cracked up on the bottom.