does a rear NEED the gm additive?
does a rear NEED the gm additive? I have to fill my spear 10 bolt with some fluid...75/90 I guess is the right weight, but does it REALLY need that gm additive...car sees like 50 miles a week..
Erik
Erik
Auburns and Eatons have clutches so you cant use synthetic oil, they get mineral oil with the additive to make the clutches happy.
Torsens have no clutches, so they get mineral oil or synthetic oil, no additive is needed. You can ad the additive to the torsens if they are noisy, its supposed to help take some noise out. GM actualy issues a bulliten on it for a torsen with a "rusty screw noise" same information is on torsens website
Torsens have no clutches, so they get mineral oil or synthetic oil, no additive is needed. You can ad the additive to the torsens if they are noisy, its supposed to help take some noise out. GM actualy issues a bulliten on it for a torsen with a "rusty screw noise" same information is on torsens website
for torsen : if installing new gears. put regular non-synthetic fluid in. than do full complete fluid change (meaning the rear diff. cover off, not just through the drain plug if you have one) at about 500-1000 miles. than put synthetic in. no need for additive if using sythetic.
if just changing fluid. take rear diff coer off. do a nice comlete clean change and use synthetic. no additve needed. especially whe using Royal Purple
if just changing fluid. take rear diff coer off. do a nice comlete clean change and use synthetic. no additve needed. especially whe using Royal Purple
Last edited by Crash00527; May 18, 2007 at 08:10 PM.
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The GU codes only refer to what gear ratio the car has.
As stated in the FAQ:
GU6 = Manual transmission cars only... 3.42 gears
GU5 = Automatic transmission with performance ratio... 3.23 gears
GU2 = Automatic transmission with 2.73 gears
Most cars of 98 vintage came with the Auburn differential. Most cars 99 and younger got the Torsen.
As stated in the FAQ:
GU6 = Manual transmission cars only... 3.42 gears
GU5 = Automatic transmission with performance ratio... 3.23 gears
GU2 = Automatic transmission with 2.73 gears
Most cars of 98 vintage came with the Auburn differential. Most cars 99 and younger got the Torsen.
Yeah thats what I was thinking. I dont think the torsens need it and the trutrac is just like the torsens. But will it hurt it, if you run the additive? before I knew I added it , on 2 services and it wa sjust fine.
i actually installed my back up 10 bolt today (8 hour job BTW)...added 2.5 quarts of Mobil 1 75/90...no additive..it said good for all diffs....itll do jus fine 
erik
erik
