1996 GM 1500 4x4 transfer case

Canada
October 12, 2006 5:38pm CST
my transfer case is spitting out of gear in reverse,but only in 2 wheel high and 4 wheel high...I have had it in the shop and they can't find out what it is..they even replaced it and it is still doing it...what could it be....any info would be great...Thankyou in advance Paul.
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