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Hey guys so when I first got my used foxbody it had a very bad highway vibration. Anything past 80 was actually quite alarming. I had the u-joints rebuilt and that took care of about 80% of it. Great! But still, while I am on the highway, ~60mph and up, the shifter vibrates quite a bit. You cannot see it but if you touch the shifter it's very noticeable. Eh, not a big deal, but now that I've been doing some long drives, the shifter bolts have started to loosen themselves and there's now a rattle under the shifter too (even after I tightened them back up). I think I may have broken something under there.
Now, aluminum drive shafts aren't thaat cheap so I did not want to get one unless I really thought that was it. I have heard that vibrations can hurt your trans/engine mounts and I don't want to do any slow damage too.
Anyone have any other guesses as to what it could be or how to diagnose it?
Thanks a ton
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If after that, have your driveshaft checked. May have lost a weight off it.
306 with all bolt ons, letter cam, ported E7's, T5 swap, full exhaust, 3:55's, 2" drop, and the worst paint you'll ever see or feel.
Dyno'd 300/316, 2745lbs-track scale
Best ET………12.4@108, 1.66 60ft on 8" ET Drags.
24 mpg (combined)
Okay well I went under there and pushed everything around, there is no up and down play in the diff pinion but the yolk in the tailshaft of the transmission knocks up and down about a 1 mm. If I made a video you could not see it move but you could hear the knock of it moving for example. I don't know if that is enough to make a vibration but it would make sense since the vibration is such a high frequency. How the heck do you replace that bearing??? Is it a huge job?
Drain the fluid , pull the drive shaft out and see if you can move the out put shaft around. My t45 is very similar to the t5 at the out put bearing and bushing, when I rebuilt it there was no play at all in the tail shaft, but a tiny bit may be acceptable.
There is a brass or bronze bushing in the tail shaft that supports the drive shaft yoke and it is likely worn out. There should be no play there at all once the drive shaft is installed.
There is a special tool that you can use to remove that bushing and install a new one. Look for tool "JT-0160A" with out it your stuck pulling the tail housing off the trans to get the bushing out. Eventually the trans will start leaking fluid past it. It sounds to me like that is your vibration.
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