99 gmc yukon tranny vs transfer cage

Neci

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When going into reverse I heard a loud bang then my car stopped going into reverse. its as if the back tires are locked. you can push hard on the gas and it will move but it makes a loud noise and jumps backwards. So it shifts into reverse but doesn't want to move. it also makes the noise when you push it backwards even in nutral
when you go forwards it is ok until u get to 10-15 mph then it makes a whinning noise as well. The shop says its the tranny but won't guarantee that it is the tranny and if they are wrong they will stil me for rebuilding a tranny that never needed rebuilding and charge to rebuild the transfer case. any help would be truly appreciated.
 


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