# Rear Differential Fluid

**URL:** <https://forums.speedlife.net/t/rear-differential-fluid/174881>\
**Category:** PittSpeed Off Topic\
**Created:** [June 10, 2005, 6:26pm UTC](https://forums.speedlife.net/t/rear-differential-fluid/174881 "2005-06-10T18:26:42Z")\
**Posts on this page:** 12\
**Page:** 1

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**Author:** ![S10Blazed\_Si](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s10blazed_si/32/5983_2.png) [@S10Blazed\_Si](https://forums.speedlife.net/u/S10Blazed_Si)\
**Post date:** [June 10, 2005, 6:26pm UTC](https://forums.speedlife.net/t/rear-differential-fluid/174881/1 "2005-06-10T18:26:42Z")

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Is there any special kind out there that doesn’t cost an arm and a leg? I have to pull my cover off and figured while I am changing fluids I might as well put in some good stuff. Is there a such thing as good diff. fluid? I’m just un aware so I’m looking for advice. Thanks.

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**Author:** ![traydogg6969](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/traydogg6969/32/5999_2.png) [@traydogg6969](https://forums.speedlife.net/u/traydogg6969)\
**Post date:** [June 10, 2005, 6:29pm UTC](https://forums.speedlife.net/t/rear-differential-fluid/174881/2 "2005-06-10T18:29:34Z")

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redline

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**Author:** ![Pewter](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/pewter/32/5936_2.png) [@Pewter](https://forums.speedlife.net/u/Pewter)\
**Post date:** [June 10, 2005, 7:19pm UTC](https://forums.speedlife.net/t/rear-differential-fluid/174881/3 "2005-06-10T19:19:51Z")

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just use napa 80-90

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**Author:** ![GNocide](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gnocide/32/5947_2.png) [@GNocide](https://forums.speedlife.net/u/GNocide)\
**Post date:** [June 11, 2005, 5:02am UTC](https://forums.speedlife.net/t/rear-differential-fluid/174881/4 "2005-06-11T05:02:22Z")

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mobil 1 and use the gm rear diff additive or a good copy like k&w

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**Author:** ![Pewter](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/pewter/32/5936_2.png) [@Pewter](https://forums.speedlife.net/u/Pewter)\
**Post date:** [June 11, 2005, 6:18am UTC](https://forums.speedlife.net/t/rear-differential-fluid/174881/5 "2005-06-11T06:18:03Z")

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no^

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**Author:** ![S10Blazed\_Si](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s10blazed_si/32/5983_2.png) [@S10Blazed\_Si](https://forums.speedlife.net/u/S10Blazed_Si)\
**Post date:** [June 11, 2005, 7:03am UTC](https://forums.speedlife.net/t/rear-differential-fluid/174881/6 "2005-06-11T07:03:46Z")

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Do they sell these at AutoZone or something? I know Napa is probably only sold at Napa

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**Author:** ![Pewter](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/pewter/32/5936_2.png) [@Pewter](https://forums.speedlife.net/u/Pewter)\
**Post date:** [June 11, 2005, 7:26am UTC](https://forums.speedlife.net/t/rear-differential-fluid/174881/7 "2005-06-11T07:26:00Z")

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get the napa or gm

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**Author:** ![S10Blazed\_Si](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s10blazed_si/32/5983_2.png) [@S10Blazed\_Si](https://forums.speedlife.net/u/S10Blazed_Si)\
**Post date:** [June 11, 2005, 7:27am UTC](https://forums.speedlife.net/t/rear-differential-fluid/174881/8 "2005-06-11T07:27:39Z")

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cool, thanks. How much does a stock s-10 axle hold?

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**Author:** ![Pewter](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/pewter/32/5936_2.png) [@Pewter](https://forums.speedlife.net/u/Pewter)\
**Post date:** [June 11, 2005, 7:32am UTC](https://forums.speedlife.net/t/rear-differential-fluid/174881/9 "2005-06-11T07:32:06Z")

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2 1/2

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**Author:** ![S10Blazed\_Si](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s10blazed_si/32/5983_2.png) [@S10Blazed\_Si](https://forums.speedlife.net/u/S10Blazed_Si)\
**Post date:** [June 11, 2005, 7:36am UTC](https://forums.speedlife.net/t/rear-differential-fluid/174881/10 "2005-06-11T07:36:12Z")

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quarts?

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**Author:** ![Pewter](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/pewter/32/5936_2.png) [@Pewter](https://forums.speedlife.net/u/Pewter)\
**Post date:** [June 11, 2005, 7:50am UTC](https://forums.speedlife.net/t/rear-differential-fluid/174881/11 "2005-06-11T07:50:15Z")

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sorry,yes

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**Author:** ![PittsburghSvt](https://avatars.discourse-cdn.com/v4/letter/p/3da27b/32.png) [@PittsburghSvt](https://forums.speedlife.net/u/PittsburghSvt)\
**Post date:** [June 14, 2005, 2:34pm UTC](https://forums.speedlife.net/t/rear-differential-fluid/174881/12 "2005-06-14T14:34:36Z")

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85w145 with about 8oz of ford friction modifer works like a charm…