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#1
01-02-2006, 11:49 PM
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Changing fluids
I want to go ahead and change the fluids in Rear and front differential and the transfer case, what kind of oil to use ? For the engine and tranny I use Valvoline.
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My Truck: 2000 Silverado,, Z71 5.3 Ext. Cab, Long Bed Original motor + transmission! As of 3/21/14, I'm at 266,300+ miles! My wife's Truck: 2005 F150 Lariat CrewCab (Way nicer them my truck!) 
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#2
01-03-2006, 10:25 AM
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Re: Changing fluids
I've used Valvoline GEAR OIL before and had no problems. I'm sure you probably know, but I feel compelled to say anyway.....
Do not use regular oil in the differential, It is way to thin.....Any auto store will carry gear oil....
__________________
Some people see things as they are and say "Why?". I dream of things that never were and say "Why not."" -George Bernard Shaw "Mind over matter: If she doesn't mind, It doesn't matter" -Nineball 
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#3
01-06-2006, 04:11 PM
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I found out I can use Valvoline 75W90 Gear Oil for both front and rear differential but what do I use in the transfer case ?
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#4
01-06-2006, 10:36 PM
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Re: Changing fluids
If you have Autotrac 4x4 I would highly recommend GMs fluid specifically for that (available from the dealer). If you have a floor shifter, I have no idea... I would enlist the help of the owner's manual (assuming you still have it) or ask the dealer what to use.
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 2004 Chevy z71 BF Goodrich T/A KO 285/75/16s. Flowmaster 40 Series exhaust. K&N intake. Stull billet grille. F-150 torsion bar index keys. 800w stereo system.
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#5
01-07-2006, 09:02 AM
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Anyone know how to find out what rear differential i have ?
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#7
01-07-2006, 01:23 PM
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Re: Changing fluids
I would use Royal Purple. You can go to www.royalpurple.com to find a dealer closest to you. It is an excelent oil. A little pricey but worth it.
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#8
01-08-2006, 01:47 AM
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I have to agree with horse, when i do mine im going with royal purple, im just trying to find somewhere that carries it. Ive seen dyno tests done to where the trucks performace increased after all the fluids had been changed.
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   99 Z-71 5.3 liter. Jet stage 2, volant cool air intake, flowmaster 40 series, billet grill, clear corners, chrome bed rails, pioneer cd player, Infinity Kappa speakers, silverstars.http://www.cardomain.com/ride/2094079
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#9
01-10-2006, 12:39 AM
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What is this PRO code ? Only thing I see is the vin# Is there a way to see by looking at my rear axle to see wich one it is ? Only need toknow how much gear oil I need.
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#10
01-10-2006, 07:54 AM
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I put amsoil in mine, and it seems to be doing ok. As for the transfercase, if you have the autotrac, automatic 4x4 button on the dash then you have to use the blue fluid from gm, its expensive.
I used Severgear 75 -80w in front, and 75-140w in the rear. I wish I would have just used the lighter stuff in both. I think it was $9 a quart.
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#11
01-10-2006, 07:57 AM
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Re: Changing fluids
Here is a site that you can look up the types of oil.
http://www.amsoil.com/scripts/runisa...msoiloaf:index also I don't sell the product, I just use it. I have had very good results with it.
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