Factory LT1 Rear End Question
Thread Starter
Registered User
Joined: Sep 2010
Posts: 29
Likes: 0
From: Spring Hill, Florida
Factory LT1 Rear End Question Doing a complete tune up on the formula, need to know what weight gear oil goes in her rear.
75w-90
80w-90
75w-150
Just a few of the options I have at work. Also, switching from factory spec'd gears to aftermarket 3.73 ratio ring and pinion, does the weight stay the same? I was thinking it might go a notch thicker.
Thank you in advance.
75w-90
80w-90
75w-150
Just a few of the options I have at work. Also, switching from factory spec'd gears to aftermarket 3.73 ratio ring and pinion, does the weight stay the same? I was thinking it might go a notch thicker.
Thank you in advance.
Last edited by Xer0ta; Sep 8, 2010 at 09:59 PM.
TECH Veteran
Joined: Dec 2008
Posts: 4,147
Likes: 62
From: Little Rock, AR
Right from the owner's manual...
Limited-Slip Differential
To add lubricant when the level is low,
use Axle Lubricant (GM Part No.
105227 1 ) or SAE 80W-90 GL-5 gear
lubricant. To completely refill after
draining, add 4 ounces (1 18 ml) of
Limited-Slip Differential Additive
(GM Part No. 1052358). Then fill to the
bottom of the filler plug hole with Axle
Lubricant (GM Part No. 12345977) or
SAE 80W-90 GL-5 gear lubricant
To add lubricant when the level is low,
use Axle Lubricant (GM Part No.
105227 1 ) or SAE 80W-90 GL-5 gear
lubricant. To completely refill after
draining, add 4 ounces (1 18 ml) of
Limited-Slip Differential Additive
(GM Part No. 1052358). Then fill to the
bottom of the filler plug hole with Axle
Lubricant (GM Part No. 12345977) or
SAE 80W-90 GL-5 gear lubricant
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