I'm a smart ask sometimes. Dan's comment about vibrations at excessive speed reminded me of a post I sent to the LCML a few years ago (see below). Also, Dan at the time as long as it was daylight I was legal (Montana). There were several 40 series owners having a discussion about vibrations with Swampers, SOA, etc... at speeds of 75-80mph. Boy did I get the email. My favorite response was Mark Whatley's posted below. I guess I still don't have a handle on email/BBS punctuation.
Land Cruiser wrote:
>
> I have a slight vibration when at speed. When I'm
> doing between 90-95 mph. It almost feels like the
> clutch is slipping. But when I push the clutch in, it
> still vibrates. It also occurs between 40 and 45 miles
> an hour. It usually goes away at about 120mph. After
> I hit 120 I have to really pay attention so I don't
> notice the vibration anymore. Maybe I should just
> always drive that fast. Any ideas? I have OME
> suspension , 33x9.50 BFG All Terrains, 350TBI, Ranger
> Underdrive , otherwise stock driveline.
>
> =====
> Eric V. mailto:lcsixty@yahoo.com
> 85 FJ60 350TBI/Ranger Underdrive OME w/ Rancho 9000s
> TLCA 7328
http://www.angelfire.com/id/nwcruisers
> Mountain Home, ID
The vibration is caused by your guardian angels and every shred of
common sense, responsibility and sanity jumping ship and diving for
cover.
If you are really looking for a real answer, then consider that at
speeds of 90mph and above it will be just about impossible to damp out
the various vibrations of these kind of tires (never designed or
intended for high speeds), ANY wear in ujoints slip joints or pinion
bearings, any less than perfect balance of the shafts, or even inbalance
of the wheels/tires (I doubt that your tire shop tries to get 33 inch
All Terrains to rotate perfectly at speds of over 100mph.
The fact that it occurs and re-occurs at different speeds would led me
to suspect that you are experinceing a harmonic caused by imbalance of
tires (most likely), rather than worn joints or bearings.
The best solution... buy a sports car for highspeed travel, not a
station wagon on steroids.
Mark...
--
Mark Whatley
Owner, Cruisers Only, Wasilla Alaska
Mailto:cruiser@mtaonline.net
Technical Editor, Toyota Trails, TLCA
Mailto:techexchange@tlca.org