Vibration, help please ?
Thread Starter
Joined: Mar 2010
Posts: 16
From: quebec
OK, it's a high frequency, intermittent (cycling) resonance to be a touch technical. Hmmm... One thing jumping out at me is something making contact that normally shouldn't, ie, exhaust on the frame, rear trans mount grounded out, engine mount collapsed. I can't rule out pinion bearings and such, but it's rare that anything from the driveshaft back will come and go at 4-5 seconds. Check mounts and exhaust and get back to us. Let's don't play that "Looks OK" business, we need to put some pressure on the mounts and really check them. Really, you just described the classic collapsed trans mount.
2nd Gear Member
Joined: Apr 2009
Posts: 446
From: Texas
No need to take it off. Put a prybar between the trans and crossmember. If you can lift the trans enough to "drop it" with a slight clunk, it's bad. If it just "mushes" back into place after only allowing you to lift it 1/4 to 1/2 inch, it's good. You can do similar with engine mounts, but it's much easier to check them with a helper watching the engine for movement while torquing the engine in forward and reverse gears. If you can load the engine up while holding the brakes and only get the aircleaner nut (point of reference) to move an inch or less, the mounts are likely good.
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ccdguy
5.0L (1979-1995) Mustang
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Sep 19, 2015 05:20 PM
