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| Moderated by: Greg Fletcher |
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| 75 jh rear diff and transmission | Rate Topic |
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| Posted: 12-03-2015 02:50 am |
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1st Post |
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Joenpate56 Member
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What oil is best for the diff and transmission. I don't believe either one has been changed since 1976. Any tips for draining and replacing the fluids? Thanks
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| Posted: 12-03-2015 08:48 pm |
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2nd Post |
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Frank Schwartz Member
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If it is a five speed 80-90 gear oil is proper for both the rear end AND the tranny. If a four speed, 20W50 for the gear box and 80-90 for the rear diff. DO NOT put 80-90 in the four speed gear box... As to filling ..the four speed gear box holds 3.1 pints and the five speed gear box holds 4.2 pints...the rear axle in both cases uses 3.1 pints...and the proper way to fill each is to the point where it flows out the fill opening..meaning it is full.
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| Posted: 12-03-2015 10:50 pm |
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3rd Post |
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Joenpate56 Member
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Thanks Frank I haven't looked but are there drain plugs on each
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| Posted: 12-04-2015 01:55 am |
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4th Post |
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Jensen Healey Super Moderator 
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There's no drain plug on the diff. I pumped the old oil out with a cheap gear lube pump for a quart bottle, about $8.
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| Posted: 12-04-2015 03:11 am |
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5th Post |
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Joenpate56 Member
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THANKS. I'll pick one up
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