Scott Lemser
>>> JT McBride writes.
Hmmm. Regarding your tire size problem:
I have seen some interesting and thought provoking (NO THINKING)
replies concerning this gentlemens'' vibration woes. But it would
seem that everyone is overlooking the more obvious and probable
cause of his problem.
The 4wheel drive line is comprised of 3 propeller shafts, what
amounts to 2 transmissions and 2 differentials. I have had similar
problems with three different 4x4's of different makes and model
years. In all three cases, the problem was from the same area, and I
will relate this on to you, my peers.
You stated that you feel the vibe thru the seat, this virtually
eliminates any accessory attached directly to the front axle.
You also say that it does not do this in 2wd. This statement
eliminates tire balance, leaving only one area to concentrate on.
Since it is only noticeable in 4wd on a smooth surface, there must
be an imbalance in the Transfer Case.
However, because the operation of the 4wheel drive system almost
always amplifies drive train anomalies, it is possible that this
condition does exist at all times and has not become bad enough to
notice yet. With that in mind, locate a drive line / drive shaft shop and
have the drive shaft checked for balance. Most reputable shops will
also check for excessive play in the Pinion gear(Bearing) as well as
the correct wear pattern on the Ring and Pinion gears. If these are
not the problem, it is more than likely that the belt/chain/gears in the
Transfer Case have excessive play in them.
Whatever the cause, it is not going to go away. It will get worse over
time.
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