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Discussion Starter · #1 ·
hey folks, first post so excuse th newbie stuff..
i have a 2010 GMC sierra Z71 SLE quadcab short bed. thats the stuff i do know lol

what about rear's?... tranny and transfer case?... tranny is a 6 speed auto

thanks for any help, i think the gears are 3:42?
 

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2017 Silverado LTZ Z71
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4,804 Posts
Open your glove box and look for the GT# code and tell us what it says.

Sent from my iPhone using Tapatalk
 

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Discussion Starter · #5 ·
ok i had 2 stickers in glove box, 1 is the service parts id with columns of letters and numbers mostly in groups of 3 the other is about camper load stuff... no where do i see at GT code, there is a GTin my serial number but other than that nothing.
 

· Supr Moderator AutoTech SS-Guru Mbr Extraordinaire
2015 High Country Duramax
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It won't be GT. It will be most likely GU6 which is 3.42.

But here are the codes to check anyway. Look for the ones that begin with "G"

GU4= 3.08
GU5= 3.23
GU6= 3.42
GT4= 3.73
GT5= 4.10
G80= LOCKING DIFF
 

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Discussion Starter · #8 ·
thanks i ran my vin through one of those decoder sights and got all the info except the gear ratio lol
i found ( in those many rows a GU6 and G80 beside it so im good thanks so much for the help. i figured either 3.42 or 3.73, wasnt sure about the locker though, i always thought it was the traction control kicking in and limiting the power till it locked up and got traction...

any special fluid to use in the rear for the locker?
 

· Supr Moderator AutoTech SS-Guru Mbr Extraordinaire
2015 High Country Duramax
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19,445 Posts
The traction control on these trucks makes them practically useless off road if you get stuck.

My father's 09 literally would not let the wheels spin when I got stuck in snow. I had it in 4 hi and foot to the floor and it would spin the wheels for a split second then cut all engine power so it was just idling. You can't even shut it fully off when you press and hold the button to "disable" stabilitrac and traction control. Only way is to put it in 4 lo or pull the fuse.

As for the oil, no, do not put any additives in there. It just takes regular 75w90 gear oil. You'll likely notice most of the name brand gear oils say limited slip on them. I've used mobile 1 and valvoline in several trucks with the G80 and haven't had any issues. As long as you don't add any more you'll be fine.
 
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