3.42 swap for 3.73

[Leedall24]

Destroyed a G80 3.42 differential. It literally locked up at about 45mph skid hopping to a stop. No warning, except a loud howl and a loud metal to metal bang as I let off gas coming to a round about. Driveshaft and  snapped yoke laying on road. 
Ride: 2015 Silverado 1500 LTZ CREW.4WD. 35s. 6”.

GM dealer wants 7K to fix. WTF?!!

Plan: Find used complete rear axle and swap. 
Question: Can I put swap the destroyed 3.42 for 3.73? Will I need to change the front diff also? Should I go back to G80? I keep reading they are junk…..??

FYI: Just a shade tree mech here. Don’t know everything. 
Any advice appreciated. 

[Grumpy Bear]

Find a driveline shop and yes, the front diff will need regearing as well if you want to change ratios. That estimate is way out of line. Not of fan of the G80. Truetrac. That and a Yukon gear and bearings for just the rear is about $1.5-$2K. 

Edited 2 hours ago by Grumpy Bear