"Boing" - Noise when I Stop!

[mlgraham at bmi.net]

Well,  I put in a rebuilt front drivers side axle in my 86 5000 TQ, and
all of my vibration, horse power issues disapeared during my initial test 
drive of about four miles.

The next time I jumped into the car to drive it,  It started making
"Boing" noise like a large spring letting go every time I come to a
complete stop.  Also, the brake flashing triangle is now comming on.

Is this normal for a rebuilt front drive shaft? Does the axle need to be
aligned in some manor when its reassembled?  For the brake flashing
light, could I have knocked the sensor out of alignment?

Or could the braking/front suspension be moving which cause the original
axle to tear the front boot at the wheel, and this same
braking/suspension movement is now its starting to work on the new
rebuilt axle, which may cause it to fail?

Any assistance would be greatly appreciated before I climb back
underneath the car!

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