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rod · 05-07-2010, 01:09 PM

9" fords need extra gear lube. the front bearings do not oil as well in race conditions as in a street car. using a smooth spool actually makes matters worse as there is nothing to 'throw' oil up to the top tunnel which oils the front bearing.
some cases have a front plug [driver side] which can be checked for lube. some housing have a factory fill hole. if you have one of these type case/housing...then you may have to tip the car to one side to add extra lube. fill to 'normal' and then add, ad minimuuuun 1/2 pint if you have neither, then you most likely have a welded filler towards to the top. you will have to design a dip stick. something on the order of half way.
2 1/2 quarts is about right, unless you have a very narrow housing.
using a spool, you can use snythetic lube. which will help ET. if someone is using a ford trac-lok or some other type of clutch differential, DO NOT use snythetic lube or any additive which would normally used for street use.
also remember extra lube requires extra time to warm the lube to a good operating temp. thick lube costs ET.
rod

05-07-2010, 01:09 PM	#4
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 313 Likes: 0 Liked 20 Times in 15 Posts	Re: 9" Ford diff gear oil 9" fords need extra gear lube. the front bearings do not oil as well in race conditions as in a street car. using a smooth spool actually makes matters worse as there is nothing to 'throw' oil up to the top tunnel which oils the front bearing. some cases have a front plug [driver side] which can be checked for lube. some housing have a factory fill hole. if you have one of these type case/housing...then you may have to tip the car to one side to add extra lube. fill to 'normal' and then add, ad minimuuuun 1/2 pint if you have neither, then you most likely have a welded filler towards to the top. you will have to design a dip stick. something on the order of half way. 2 1/2 quarts is about right, unless you have a very narrow housing. using a spool, you can use snythetic lube. which will help ET. if someone is using a ford trac-lok or some other type of clutch differential, DO NOT use snythetic lube or any additive which would normally used for street use. also remember extra lube requires extra time to warm the lube to a good operating temp. thick lube costs ET. rod