Well this is from the OWNERS MANUAL:
Recommended Fluids & Lubricants NOTE: Fluidsandlubricantsidentifiedbelowbyname,part number or specification may be obtained from your GM Dealer.
Engine Oil
I E n g i n e l a n t
HydraulicClutchSystem HydraulicBrakeSystems
CaIBbPlreaskrkeing rSSPteyoeswtreienmrg
FLUID/LUBRICANT
M; GoodwrenchMotor Oil orequivalentforAPIService SG )r SGiCE oftherecommendedviscosity.
ManualSteeringGear AutomaticTransmission
Manual Transmission:
a.5-SpeedwithLowGear 1 b. 5-SpeedwithouLtowGear
Differential:
a. Standard(Saginaw)Front andRearAxle
b.Locking TransferCase
I G a s - Strips Weather
ColumnShift,TransferCase ShiftLever,andPropellerShaft.
StuBdaFCllolurktch
iydraulic ClutchFluid (GM Part No. 12345347orequivalent).
lelco Supreme11 8 brake fluid (GMPartNo.1052535or lOT-3).
(2hassisgreasemeetingrequirements of NLGlGrade2, (2atagoryLBorGC-LB(GMPart No. 1052497).
(3iM PowerSteeringFluid(GMPart No. 1050017)or t2quivalentconforming to GM spec9985010.
3M Lubricant(GMPart No. 1052182)orequivalent. IEXRON@ IIE AutomaticTransmissionFluid(GMPart No.
1051 855).
a.CastrolCo Syntorq orequivalent(GMPart No. 12346074).
I b. StandardTransmissionFluid(GMPartNo.12345349). a.SAE-80W-90gearlubricant(GMPart No.1052271).
b. SAE-80W-90 gearlubricant(GMPartNo.1052271). DexronB IIE AutomaticTransmissionFluid(GMPart No.
12345881).
IL?asLineDe-leer(GMPart No. 1051516). I:Spray-ASqueek(GMPart No.1052277).
>hassisgreasemeetingrequirementsofNLGlGrade2, ;ategory LBorGC-LB (GM Part No. 1052497).
(zhassisgreasemeetingrequirements of NLGlGrade 2, (;ateaorv LBorGC-LB(GMPartNo.1052497).
(Continuednextpage) TO391
intifreezeconformingto GM-6038-M (GMPart No. 1052103). II
ilixture of waterandagoodqualityethyleneglycolbase
7-25
It would be a lot easier to read in the manual itself.. All I could was copy and paste - that’s just how it came out. We do not know the specific ‘type’ of differential that this particular vehicle has to be able to answer your question accurately. (*Limited slip* differentials take a specific lubricant)