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Old September 24th, 2011, 05:51 PM   #1
HVYRTFT
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Default 04 1500 z71 g80

2004 Silverado 1500
Crew Cab
Z71 Pkg

Changed out rear diff fluids. Since this has the Z71 off road package which includes the G80 mechanical locking differential, does this require LSD additive? I am saying no, because it is mechanical and not clutches like a Ford LSD. Discuss.
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Old September 24th, 2011, 07:17 PM   #2
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it does have clutches inside the case. LSD additive is a good idea to put in.
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Old September 25th, 2011, 07:35 AM   #3
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IIRC, it's not necessary for an additive. Unlike the clutches in a "regular" LSD that get work every time you turn a corner - the clutches in a GovLock only engage once there is a 100 rpm difference between wheels.
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Old September 25th, 2011, 10:28 AM   #4
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Just put 75w140 in it and be done!!! It's not that much more than regular gear fluid!!
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Old September 25th, 2011, 05:01 PM   #5
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Quote:
Originally Posted by ScOoTeR View Post
IIRC, it's not necessary for an additive. Unlike the clutches in a "regular" LSD that get work every time you turn a corner - the clutches in a GovLock only engage once there is a 100 rpm difference between wheels.
this is true but without a friction modifier the clutches will not engage with enough force to cause wheel lock up. instead they will slip and eventually burn up.
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Old September 25th, 2011, 05:08 PM   #6
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I thought the gov lock was mechanical and not clutches.
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Old September 25th, 2011, 08:45 PM   #7
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I thought the gov lock was mechanical and not clutches.
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Last edited by Kodiak450r; September 25th, 2011 at 08:51 PM.
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