What are the symptoms of a slipping x-fer case chain?

[waggin'ear]

During normal operation my wag seems to running fine (360, 727, NP219). However, when i accelerate quickly from a dead stop (which i think equates to the highest torque on the drivetrain?) i hear a noise that i would imagine that a slipping chain would have (having never heard one i could be FOS). It is similar to a gear grind, but lower pitched and it has a "hollow" or echoing quality (i'm not sure if this echo effect is just because the noise is coming from under the truck). it is worst when i am in 4lo, but has happened in all positions. Are there other things that could have these symptoms. diveshaft/differential, suspension?

thanks in advance

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adam
'82 wag ltd, 152k
360 AMC, 2vl, NP219, 727
stock, down to the original radio (w/cassette player!)

[porkchop]

When mine was slipping it would make a load popping sound. It was easy to tell what it was.

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'67/'79 Wagoneer mix
"Red"
Check it out!

Mods, Mods, and more Mods! The end is no where in sight, but I am sure I am closer to the fork in the road.