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1990 GMC 1500 Pickup Question: How do I find out which rear diff to get? No tag in glovebox to check

 

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IanOdie, 5.7L V8, Woodbury, NJ, July 15, 2014, 11:35
 Rookie

Replacing the whole rear on my truck, and I need to know what rear differential to get. Unfortunately, my glove box was broken and taken out a few years ago, so it's just an open space to look at wires. Also the drive shaft is locked up, so I can't just spin the tires, and watch the shaft to figure it out. Any suggestions?

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