Jim,
Don't be surprised if the rims have excessive run
out...that is if they're stock. I sold a guy a set of
4 rims with the promise to get him 4 good ones. We
ended up going through about 8 before we came up with
4....according to the Tire shop.
Also, check for broken belts in the tires. That can
cause all sorts of weird vibrations.
Lot's of other things to consider ie: u-joints, bad
rear hubs(wiped out bearings) and or bent flanges(part
that the wheels bolt to). Usually you'll notice that
type of things at all speeds though.
An out of balance tire will definitely cause
vibrations at certain speeds...that is it will be
noticeable at certain speeds.
Heck, make sure the nuts that secure the differential
are tight too.
Some things to think about
Todd Bermudez
CD198L
CF25768UO
--- Jim Farris <jfarris@troy.edu> wrote:
> My son brought his car (1973, unknown mileage,
> unknown driveline
> maintenance) home from school over the weekend and
> mentioned a vibration.
> Sure enough, between 2,500 and 3,000 RPMs in both
> third and fourth gear, the
> car starts to vibrate. Believing it might be
> universal joints, we jacked it
> up and checked the driveline. The universals felt
> "OK" with no real slop
> that you could feel in them. The differential had
> about the same amount of
> "looseness" as the other times we had checked. We
> found that the universal
> joints attaching the rear axles to the differential
> were loose enough to
> visually see the two adjoining metal plates turn
> independently (sounds bad,
> but you could just barely see that they were loose).
> We tightened all eight
> bolts. The vibration is pretty much the same.
> Thought we would have the
> wheel balance checked first, but I believe the
> vibration is drive line
> related.
>
> What do we need to look at next? What do we
> rebuild/replace first.
>
> Thanks in advance,
> Jim Farris
> Montgomery AL
>
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