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Looking to change the oil in my front and rear end. Are there factory recomendation(I cant find them...) or will any work? What would you recommend for a 97 blazer/Jimmy. Also, when replacing it, should I just fill it up untill each axle is topped off with fluid coming from the filler?
 

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Differential/Final Drive Fluid Type Location Type Grade ° Celsius Viscosity Note
front - GL-5 ALL TEMPS 80W-90 503, T73
rear - GL-5 ALL TEMPS 80W-90 503, T73
rear controlled slip GL-5* ALL TEMPS 80W-90 T40
rear standard GL-5 ALL TEMPS 80W-90 T40
503: 80W-90 GL-5 is a synthetic lube; GM part no. 1052271.
T40: 1988-99 models Do not use synthetic lubricant in axles using RTV sealant. Synthetic lubricant will chemically attack RTV sealant. American Axle has only approved the use of Synthetic Lubricant 75W-90 GM part no. 12378261, as follows: a. All 8.6" rear axles are compatible. b. All 9.5" rear axles built before mid-February 1998 (RTV sealant used to seal cover pan) are not compatible c. All 9.5" rear axles built after mid-February 1998 (equipped W/ cover pan & gasket) are compatible. d. All 10.5" rear axles built prior to March 3, 1999 are compatible if axle shafthub RTV sealer is replaced W/ GM gasket part no. 327739.
T73: Do not add limited slip additive.



Hope this helps maybe someone else can decipher this for you.
 

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put your pinky in the filler hole,bend first joint,just the tip should touch oil
 
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