oil to use for Diff
#2
Supreme Member
iTrader: (2)
Join Date: Apr 2000
Location: Huntsville AL
Posts: 3,938
Received 97 Likes
on
62 Posts
Car: 88GTA
Engine: 5.7TPI
Transmission: Auto
Axle/Gears: 3.27
Re: oil to use for Diff
Use a 90w gear oil. Most have the additive for the Limited Slip already in it. If I recall somewhere, there was a bulletin out where it didn't need the additive. I've been using it for years with no problem.
Maybe somebody can chime in about it. It may be personal preference to use or not to use.
Maybe somebody can chime in about it. It may be personal preference to use or not to use.
#3
Re: oil to use for Diff
You can try the 80W90 oil without the bottle of additive and see if it works. If the rear end pops and jerks when turning tight corners then you will need to add a bottle of the GM limited slip oil additive.
#4
Supreme Member
iTrader: (1)
Join Date: Sep 2005
Posts: 26,051
Received 1,672 Likes
on
1,269 Posts
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: oil to use for Diff
9-bolt doesn't need additive; its clutches are metal. Not subject to the effects that organic clutch materials are.
Generally, that rear is not real picky about fluid.
I agree that most anything in about a 90 weight oil is fine. Stay away from the heavy stuff like the 75W-140 and such as that. From yer generic parts store 85W-90 in a 5-gallon bucket to synthetic, all of it is fine. My personal preference is Mobil1 75W-90 but there's plenty of others that will work well too.
Generally, that rear is not real picky about fluid.
I agree that most anything in about a 90 weight oil is fine. Stay away from the heavy stuff like the 75W-140 and such as that. From yer generic parts store 85W-90 in a 5-gallon bucket to synthetic, all of it is fine. My personal preference is Mobil1 75W-90 but there's plenty of others that will work well too.
#5
Member
Thread Starter
Join Date: Jan 2009
Location: North Carolina
Posts: 289
Likes: 0
Received 0 Likes
on
0 Posts
Car: Pontiac 89 GTA
Engine: 350 TPI 5.7L V8
Re: oil to use for Diff
Hi and thanks for the Info:
I bought this for mine. Will it hurt anything if I add the GM additive?
I bought this for mine. Will it hurt anything if I add the GM additive?
Thread
Thread Starter
Forum
Replies
Last Post
Hotrodboba400
Firebirds for Sale
3
12-10-2019 07:07 PM
tyeo098
Tech / General Engine
38
11-30-2015 06:27 PM
rudolphschenker
Transmissions and Drivetrain
1
09-04-2015 02:41 AM