2002 GMC SIERRA 1500 STEPSIDE TRANSFER CASE

sc123

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What happens if I put a 4.8 transfer case in my gmc 1500 truck 2002 4x4 when it is a 5.3? Everyone says it’s okay but I’m not sure. My transmission is slipping, Is the gear ratio different between 4.8 & 5.3?
 
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