From: Terry & Carolyn Welshans (welshans2@comcast.net)
Date: Fri Oct 14 2005 - 16:42:30 PDT
"Everette" said:
I have been told to never use engine as speed brake, crankshaft will not
stand it, and to be very careful in all wheel drive that if truck has a weak
point it is front axles,
=======================
You have that right.
I replaced more than a dozen under warranty in 1968-1969. The problem is
the air operated shift for the front drive shaft sticks due to torque
buildup in the drive line when turning or the front wheels slipping more or
less than the rear wheels. It locks in all wheel drive and when driven on a
hard surface road in that condition, it causes the front axle to wear out
the kingpin bearings, and that destroys the gears in the knuckle.
This truck has a kingpin that has a keyed gear at the top and bottom that
rotates with the axle. The axle from the differential meshes with the top
gear transferring power down to the bottom gear which meshes with the shaft
that drives the planetary gear in the wheel hub.
Once the bearings that hold the kingpin wears, the gears grind themselves to
metal filings.
Regards,
Terry Welshans
Homer Glen, Illinois
"Always do right- this will gratify some and astonish the rest. "
Mark Twain (1835-1910)
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