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73-87chevytrucks.com
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73-87 Chevy _ GMC Trucks
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Engine/Drivetrain
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Rear Drivelines, Drive Axles and Gearing
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12 bolt rear end...what kind of gear lube to use? :)
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Topic: 12 bolt rear end...what kind of gear lube to use? :) (Read 12014 times)
GUITAR1989
Registered Users
Posts: 198
12 bolt rear end...what kind of gear lube to use? :)
«
on:
February 03, 2011, 11:04:14 PM »
Hey guys I need to change the fluid in my trucks rear end
I was just wondering what kind of gear lubricant to use. The rear end is a GM 12 bolt. Thanks for your time
Shayne
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SAATR
Newbie
Posts: 22
Re: 12 bolt rear end...what kind of gear lube to use? :)
«
Reply #1 on:
February 03, 2011, 11:30:21 PM »
Likely a 75w90 or an 80w90. I like Royal Purple and Valvoline Durablend, both have served me well in the past. If you have a clutch type posi, be sure to put some limited slip additive in first to prevent it from chattering.
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Grim 82
Senior Member
Posts: 1651
Re: 12 bolt rear end...what kind of gear lube to use? :)
«
Reply #2 on:
February 04, 2011, 12:04:40 AM »
+1
80w90. I've been using synthetic Valvoline on my last few trucks with good results. If you have a performance diff figure out what you have and use the oil or additive you need for that application.
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Give a man a gun, and he might rob a bank. Give a man a bank, and he might rob the world.
GUITAR1989
Registered Users
Posts: 198
Re: 12 bolt rear end...what kind of gear lube to use? :)
«
Reply #3 on:
February 04, 2011, 12:14:14 AM »
nice thanks guys. I think what my truck has is called open differential..When I have the rear jacked up I can spin a wheel and the other one doesnt move. Does that need an additive?
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Grim 82
Senior Member
Posts: 1651
Re: 12 bolt rear end...what kind of gear lube to use? :)
«
Reply #4 on:
February 04, 2011, 12:56:19 AM »
You
probably
have a stock open diff, so you can just use a conventional oil. Pop the cover and if it has all kinds of gadgets in there take a pic and we can tell you if it's something different.
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Give a man a gun, and he might rob a bank. Give a man a bank, and he might rob the world.
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73-87chevytrucks.com
»
73-87 Chevy _ GMC Trucks
»
Engine/Drivetrain
»
Rear Drivelines, Drive Axles and Gearing
»
12 bolt rear end...what kind of gear lube to use? :)