camaroboy14

iTrader: (8)

So what fluid should I use? I also added the additive and some royal purple and my rear is making a whine noise well under slight acceleration .. Also makes a lil noise when I make sharp turns , now my question is , is it the fluid I am using ? Or is it my rear ? This all started when I first changed my fluid to royal purple.. I only used royal purple because that's all they had on base :/ .. Please any advice would be awesome !! Thanks !!

speedfreak2685

iTrader: (12)

It's the fluid. My buddy changed his with Royal Purple and his did the same thing. Switched back to Auto Zone brand 80/90 and was quiet again. What diff do you have in it?

blue98Z

iTrader: (29)

What's the mileage on the rear?

Depending on the posi you may not need the additive. It can cause the posi to slip too much and this could be your noise in the turns. I never used the additive with royal purple with my auburn and it never gave me any problems. Under light acceleration it could simply be the pinion bearings but to know for sure you should check all the specs i.e proper torque, back lash, bearing life etc.

camaroboy14

iTrader: (8)

Car has 42k miles and yeah before when I had my rear end rebuilt (bearings) I forgot what fluid I used but it was not this loud and I know it was not royal purple .. My car is a 02 ss how can I find out what exactly I have in my rear? I have 373 motive gears and a trick flow girdle .. What fluid should I use? And will I need the additive ? Please let me know because I do not feel comfortable using my car making that noise :/ **** bothers me big time ..

speedfreak2685

iTrader: (12)

You would have to just open it up and look. I use 80/90 in mine. You need lsd additive if it is a clutch unit. If it is a gear unit like a trutrac ect you wont need additive.

camaroboy14

iTrader: (8)

Ok .. I will check it out.. What brand of fluid ? Sorry I have to order it from base so I need the info .. Because on base all they got is RP:/

speedfreak2685

iTrader: (12)

I use Valvoline but any conventional gear oil should be fine.

camaroboy14

iTrader: (8)

Gotcha , thanks .. And 80/90 will work?

bwkmaro

x2 valvoline syn blend, great stuff royal purple way over rated i personally wont use it in anything

speedfreak2685

iTrader: (12)

That's what I use. Most manufacturers will tell you just to use conventional and that's what I have always used. Good luck.

Ruthless909

iTrader: (19)

Conventional FTW!!!


Tis what I used on my 99 Z28






No problems.

216StealthSS

I use royal purple in my diff (stock 10-bolt), royal purple has the LSD additive in it already and not needed. conventional oil or synthetic oil needs the additive. my rear has been howling since the so called "rebuild" this guy ripped me off for. so i couldnt tell you if it was oil or not. but its in there and still whining away! we will see when i put new tires on if the diff hold up or not. i would say its not the oil though IMO. hard to find someone who actually knows diff specs and knows how to build them.

whytryz28

iTrader: (28)

Reg gear oil with additive, no need for that fancy stuff.

kyoytey1693

iTrader: (7)

I changed mine to synthetic when I installed the T/A cover with the supports and now it makes noise. Car has about 80k on it. I used the additive as well. I think it is due to the syn being a lighter fluid. I dont really think it is an issue but I could be wrong on that.

roy

Camaroboy ,
You have a couple options:
1.Go to Trost or ATU and look for gear oil there (Liquid Moly, Valvoline etc)
2. Opel dealer that services GM products.

It is a little more expensive but it is on hand .
FWIW the factory fill on the axle is syn gear oil.

If your German is not that good just be polite and ask in english.

camaroboy14

iTrader: (8)

Thanks everyone..
Hey Roy, Opel dealerships have the fluid? Yeah I hate ordering my additive through eBay costs almost 30$ for just that haha .. I was just gonna have a family member or a friend get the stuff state side and ship it .. But have them wrap it like crazy .. Idk ..

roy

That is Opel dealers that sell American cars. The ones that sell American cars have the GM logo on their sign and show room will have a couple of GM cars in it.

NVUSZ28

iTrader: (5)

Drive it down to Schweinfurt, and I'll check it out for you, if need be.

camaroboy14

iTrader: (8)

Hey z28 do you got that 10sec z28? The one at bittburg ? And I would but your almost 4 hours away :/

camaroboy14

iTrader: (8)

http://www.autozone.com/autozone/acc...ier=25555_0_0_

That one? Or

This one ?
http://www.autozone.com/autozone/acc...er=232566_0_0_