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Old 02-02-2014, 08:36 PM
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75 camaro 10 bolt

I have a 75 10 bolt 3.08 in my 76 f/bird and would like to change the fluid again . Type and amount of gear oil ? Thanks
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Old 02-03-2014, 06:15 AM
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If you have a standard differential then use 80W90 gear oil. If you have a limited slip differential then use the same oil with one bottle of GM limited slip oil additive. Do not use any other brand except the GM oil additive. Don't use the crap that the auto parts stores sell. About 2 quarts of oil. Get 3 in case you spill some.
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Old 02-03-2014, 06:21 AM
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Yep, It's a posi , Thanks
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Old 02-03-2014, 05:36 PM
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Did that chea ea ea p stuff one time years ago on a poss in a station wagon many years ago. Couldn't Get it right and had to redo the hole rear the right way. What a mess.
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Old 02-03-2014, 08:07 PM
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I'll pick up some of the GM posi lube for sure but does the lube have to be 80/90 ? Will anything like a 80/140 do or a synthetic ? I put this diff. in and have ran it for 1 season 2-3,000 mi. at the most but I would like to put a better grade in now and leave it for awhile . Thanks
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Old 02-04-2014, 06:01 AM
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Today's oil is better than what was available years ago. The film strength of the newer 80W90 is probably as good as what 90W140 was years ago. I't my opinion that the 80W90 is plenty good and causes less power loss due to easier flow of the oil. Use the heavy oil if you want, but I don't think it's needed. If you use a 75W90 synthetic then I recommend Amsoil or Mobile 1.
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Old 02-20-2014, 07:51 AM
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I picked up some LUCAS diff lube and a bottle of GM posi additive but the LUCAS says it has the additive in it so would the GM additive also be TO MUCH ??? Thanks
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Old 02-20-2014, 02:05 PM
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I've never used any of that oil that says it has the additive without having to put the GM additive in it anyway. Amsoil Severe Gear is the only oil I ever used that was any good without the additive. You can try it for a few weeks without the additive to see how it works and put in the additive later if it needs it.
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Old 02-20-2014, 02:45 PM
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I thought that I'd ad the posi additive along with the other but I wasn't sure what it would do if to much was in it . Thanks
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Old 02-20-2014, 04:42 PM
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The additive allows the clutches to slip smother. Too much additive could allow them to slip when you don't want them to.
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