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#1
10-15-2007, 07:54 AM
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Changing Diff fluid
Can I just use RTV sealant if I change the diff fluid, or is a gasket needed? And what type or weight of fluid is needed? I want to go synthetic.
Thanks!!
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2001 5.3 LS Stock 6 channel Alpine 3566 Amp Jason Extreme Slam Camper Shell Michellin X-Radials 79K Miles 
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#2
10-15-2007, 10:47 AM
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Re: Changing Diff fluid
I replaced the gasket with a new one from NAPA and used Amsoil 75w-90 Severe gear lube with a bottle of diff lock additive. Check to see how much lube you need, mine needed just over two quarts. So I just bought 2 quarts and the bottle of diff lock additive and it was the perfect amount.
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2009 Z-71 ECSB 2007 Yamaha Grizzly 700 FI
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#3
10-15-2007, 10:50 AM
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Re: Changing Diff fluid
How do I know if I have limited slip? I have the tow package, and 3:73 gears I believe. 5.3v8
I do not see a tag on the diff.
__________________
2001 5.3 LS Stock 6 channel Alpine 3566 Amp Jason Extreme Slam Camper Shell Michellin X-Radials 79K Miles
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#4
10-15-2007, 11:45 AM
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Re: Changing Diff fluid
chancers are you don't, There are two ways to tell. The fun way: mash on the throttle and see if you can spin the tire. or the boring way: look up your VIN#. Not sure which Letter or code will tell which you have, but I am sure someone on here has the answer
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  2000 Silverado Z71, 5.3L, K&N GenII Air Intake, Y-pipe Exhaust (no muffler), Bosch Platnium +4 plugs, 242k miles and still running.
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#5
10-15-2007, 12:18 PM
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Re: Changing Diff fluid
You dont need to remove the diff cover to change the fluid, there is a drain plug that can be opened with a 1/4" drive socket extention. So there is no need for a gasket.
I use the weight recommeded in the owners manual. Synthetic.
__________________
2002 1500 Ext. Cab 4.8L 2wd. K&N FIPK, Cat Back Exhaust, Rancho RSX Shocks, Silverstar Headlights High & Low, Infinity Reference Door Speakers & 10" Dual Voice Coil Sub. 265/75/16 BFG AT/KO's, Spray-In Bed Liner, Hella FF75 Fog Lights, Hella FF75 Driving Lights.
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#6
10-15-2007, 12:25 PM
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Re: Changing Diff fluid
I like to remove the cover anyway, make sure there no debris in there. I just changed the wifes front and rear diff fluid on her jeep, and found some very fine metal in there.
Is there a place to lookup my vin and see what came with? Thanks
__________________
2001 5.3 LS Stock 6 channel Alpine 3566 Amp Jason Extreme Slam Camper Shell Michellin X-Radials 79K Miles
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#7
10-16-2007, 06:26 AM
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Re: Changing Diff fluid
On my truck there was no drain plug on my rear diff. So that doesn't apply to everyone. I also like taking the cover off just to get a look see at all the parts and make sure there are no surprises.
__________________
2009 Z-71 ECSB 2007 Yamaha Grizzly 700 FI
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