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  #1  
Old 04-14-2008, 10:48 AM
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Default differential fluid

Hey Fellas I bought a used 2003 Silverado back in February so far it runs good it just has a few little things to fix. My question is the diffs. Can I run I run Mobil 1 gear fluid or should I get Chev's synthetic??
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2003 Silverado Ext. Cab 6.5 ft bed Z71 5.3L over 90,000 miles my goal is 200K
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Old 04-14-2008, 10:50 AM
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Default RE: differential fluid

Doesn't matter as long as it is the right weight and it is full synthetic. I used Mobil in the rear, Lucas on the front and Valvoline High Milelage stuff in the transfer case and transmission.
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99' Silverado 5.3 4X4
Modified Predator 93 tune: TQM @ 40%, injector slope bumped up 4 levels,
125 MPH top speed, 5500 RPM limit,
TBS, 180 thermostat, 4" CAI with 9x6" element,
Bypass and De screen performed,
AVG: 16 MPG City, 20 MPG Highway
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  #3  
Old 04-14-2008, 11:36 AM
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Default RE: differential fluid

Do you or does any one the correct weight to put in each differential and the transfer case I plan on draining the fluid in all three if these and putting in new.
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2003 Silverado Ext. Cab 6.5 ft bed Z71 5.3L over 90,000 miles my goal is 200K
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  #4  
Old 04-14-2008, 11:50 AM
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Default RE: differential fluid

Trans and transfer case is Dextron. Rear diff is 75W90 synthetic gear oil, and front I believe is the same but you do not need to use synthetic.
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99' Silverado 5.3 4X4
Modified Predator 93 tune: TQM @ 40%, injector slope bumped up 4 levels,
125 MPH top speed, 5500 RPM limit,
TBS, 180 thermostat, 4" CAI with 9x6" element,
Bypass and De screen performed,
AVG: 16 MPG City, 20 MPG Highway
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  #5  
Old 04-14-2008, 12:38 PM
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Default RE: differential fluid

Thanks for the info I appreciate it..
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2003 Silverado Ext. Cab 6.5 ft bed Z71 5.3L over 90,000 miles my goal is 200K
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  #6  
Old 04-14-2008, 01:21 PM
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Default RE: differential fluid

its gl5 (i think) that goes in the rear...any brand is ok,just make sure its approved.

and..ONLY the gm stuff is grape scented!
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  #7  
Old 04-14-2008, 07:43 PM
 
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Default RE: differential fluid

Argon - I have heard that there is a special fluid for the transfer case that you can only get from the dealer. Do you only recommend using the GM fluid and not any other aftermarket brand?
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  #8  
Old 04-15-2008, 04:54 AM
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Default RE: differential fluid

ok,the poop..it is illegal for a carmaker to say "use gm fluid..or exxon oil,etc"/..all they can do is set standards and say to ,meet it..

the rear end oil in a 99 and up is gl5 synthetic...as long as it meets that,its ok.

transfer case...they change those a lot...read your owners manual for specifics...there are probably 5 different cases for the 2008 model year...saome take atf...some synthetic.

so yes,i'd buy gm...not because its better...but because i'd know i was putting the correct stuff in
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  #9  
Old 04-15-2008, 07:46 AM
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Default RE: differential fluid

Find the model number for your transfer case and either look it up online or buy a service book. (Argon might be able to find it too). But there are around 3-4 different transfer cases I believe. Some require that "special stuff", others do not. My 99 takes plain old red stuff.
__________________
99' Silverado 5.3 4X4
Modified Predator 93 tune: TQM @ 40%, injector slope bumped up 4 levels,
125 MPH top speed, 5500 RPM limit,
TBS, 180 thermostat, 4" CAI with 9x6" element,
Bypass and De screen performed,
AVG: 16 MPG City, 20 MPG Highway
Reply With Quote
Old 04-15-2008, 07:46 AM
 
 
 
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2003, 2007, 99, avalanche, change, chevy, correct, differential, fluid, fluids, gl5, gm, oil, pickup, silverado, tundra

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