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Old 04-06-2013, 09:49 PM   #1
99_Sierra
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Join Date: Jul 2012
Location: tulsa oklahoma
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What rear gears do I have??

Alright guys my rear end started going out tonight on my way home. Have always wondered what gears I have in my rear end. So can somebody tell me where the code is that tells me what gears I've got. I have a 99 Sierra 1500 single cab z71 with a 5.3 it's a 10 bolt. There was a number on it that said 0747 if that helps anyone...

Thanks a lot guys, if you need anymore info let me know.
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Old 04-07-2013, 02:18 AM   #2
Sooner84
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Location: Moore, Oklahoma
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Re: What rear gears do I have??

Check the glove box for the RPO code. It probably has 3.73 rears which is code GT4.
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1984 chevy swb(1st truck, sold..)
2001 RCSB silverado, 5.3 with a little extra
2004 ECSB Silverado LT, 5.3 cam & bolt ons, 4l60e shift kit/stall, g80 & 3.73s

My first (1984 c10) Build
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Old 04-18-2013, 06:42 PM   #3
Benny-
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Re: What rear gears do I have??

GQ1 -- axle rear, std ratio
GT4 -- axle rear, 3.73 ratio
GT5 -- axle rear, 4.10 ratio
GU4 -- axle rear, 3.08 ratio
GU5 -- axle rear, 3.23 ratio
GU6 -- axle rear, 3.42 ratio
G80 -- axle rear, limited slip (positraction)
HC4 -- axle rear, 4.56 ratio
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