Formula/LS1

I'm pulling the axles on my 2001 Formula to put longer studs in them. My question which seems to have 50-50 yes and no's is what is best to use for gear lube, Synthetic or standard and what weight should I use. Also do I need to use a posi additive? I have 3.73's and tend to do a lot of drag racing with it and I drive it on the street also. Thanks.

neutron82

iTrader: (26)

if i'm correct auburn= non synthetic with additive, torsen= synthetic, no additive... 75/90 or 80/90 will work just fine

87gnx

iTrader: (3)

Amsoil 75/90=DONE

SOMbitch

iTrader: (8)

Yes on the additive if it is LSD no if it is Torsen. The book says Dino based fluid but I run Mobil1 Synth since it says on the bottle it is safe for LSD.

Confused now

ghardester

Yeah, I'm a little confused because the Torsen also comes in limited slip (LSD). The '01 Firebird I had with the performance package 3:42 gearing clearly states on the window sticker Torsen limited slip rear as a part of the performance option. I saved the window sticker.

I don't have the window sticker to my current '02 WS6 TA but it also has a
Torsen.

SOM02WS6

WHat high performance package are you talking about? All M6's got 3.42 all had the same diff, the only optional cars you could get different diffs in were the SS and Hawk, If you have a auto WS6 you have 3.23 gears and if its a M6 you have the same 3.42s that all others cars came with.. There was no special "performance package" for gears...

98 Auburn, 99-02 Torsen
M6 GU6 3.42 Standard
A4 GU2 2.73 Standard
A4 GU5 3.23 Optional (standard gear set with an SS/WS6/Firehawk)
28 Spline Axle 10 bolt rear end

mikedamageinc

iTrader: (49)

I think he's talking about the G80 locker, right? I've got that too and a planned rear axle service coming up soon so I'm wondering the same thing, fluid type and additive or not???

SOM02WS6

All the Ls1's if I am not mistaken came with the Gu80 LSD..

SOMbitch

iTrader: (8)

I have a g80 in my Z-71. It locks mechanically so no additive(friction modifier) is needed. The Torsen locks mechanically too so no additive needed.

The Auburn LSD uses clutches to get power to both rear wheels so the additive IS needed. I only use the GM stuff too ($7).

It is up to YOU whether to run synth or not. I have 42k running synth in mine.

I will admit it is getting noisy but that is from the MT/DR's It had a good amount of shavings on the plug when I changed it out a couple months ago

ghardester

The Firebird V6 '01 which was my previous car had an performance package that came with 3.42 Torsen LSD from the factory. That package also consists of dual outlet exhaust, uplevel steering and P235/55R16 touring tires.

You are correct that my current '02 WS6 Auto has 3.23 gearing from the factory

ghardester

Oh, and that '01 Firebird with the performance package 3.42's was a A-4 auto too. Damn low geared for the freeway. I'll scan the factory sticker for you later, got to go to work now.

SOM02WS6

Ya now it makes sense, you had the Y87 package..

Revo1

Packages? What's the verdict? SYN? This thread interests me, as I'm a new LS1 owner, and my fist oil change is comin up real quick...

Formula/LS1

Well, after not coming up with an agreement of the minds I went to Advanced Auto and Car Quest who both plugged in replacement lube and the verdict was SYNTHETIC 75/90 LS with a posi additive. So I went with that suggestion and purchased MOBIL 1 Syn. + Add. Thanks for the help, I appreciated all the feedback.

greezy

good choice. thats what the owners man says

ghardester

Didn't mean to get off subject for this thread but here is a link about the package and a door sticker, just in case anyone is interested.

Second or 3rd line;

http://www.lotpro.com/cars/2001/pont...rebird/options

This was my old car's door sticker, traded it for the TA.