9" Ford Question - Third Member Install - Vintage Mustang Forums

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post #1 of 17 (permalink) Old 05-09-2017, 09:25 PM Thread Starter
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9" Ford Question - Third Member Install

Hi All,

I am assembling my 9" axle for the 67 project, and had a question about the 3rd member install. This is a new axle housing and differential from John's Nine Inch Factory, so it's got zero miles on it and has not been together yet. The question I have is whether to use any RTV sealer when I drop in the differential. I have a Fel-Pro gasket and it fits very snugly over the lugs on the differential housing. I called John's tech support and they said if the gasket fits tightly over the lugs, I should be good without any RTV.

I'd rather not use any RTV if I can avoid that smeary mess of a product. However, I also don't want to have a brand new axle that drips 80/90 on the driveway.

What say you, axle experts? Also, is there a magic gasket better than fel-pro that will seal 100% without any RTV?

-- Mike

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post #2 of 17 (permalink) Old 05-09-2017, 09:27 PM
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I've always used nothing but a Felpro gasket and I've never had a leak. Ford actually used a copper crush washer under each nut in addition to the gasket.
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post #3 of 17 (permalink) Old 05-09-2017, 09:34 PM Thread Starter
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I've always used nothing but a Felpro gasket and I've never had a leak. Ford actually used a copper crush washer under each nut in addition to the gasket.
Thanks for the feedback - I have the hardware install kit that includes the crush washers as well.

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post #4 of 17 (permalink) Old 05-09-2017, 09:50 PM
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I used the Right Stuff and no copper washers .
The washers can be a pain to remove .

68 302-4V w/1.84",1.54" ported , Comp XE268H , 2200 rpm Hughes converter, 3.25 9" w/10x2.5" shoes , MSD box/distrib , RPM intake , 670 Holley , cross flow aluminum radiator , Granada discs......


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post #5 of 17 (permalink) Old 05-09-2017, 10:40 PM
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I have a Currie crate 9", the instructions recommend the gasket and RTV....so I complied
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post #6 of 17 (permalink) Old 05-10-2017, 07:14 AM
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I use silicone, no gasket, no crush washers.

To each his own.

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post #7 of 17 (permalink) Old 05-10-2017, 08:07 AM
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I used the crush washers, Felpro gasket and a skim coat of RTV rated for rear axle lube. The lower bolts around the case below the pinion can be a b***h to torque down, I had to use an offset extension and a torque conversion chart to get the torque values correct on those lower bolts.

John

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post #8 of 17 (permalink) Old 05-10-2017, 08:33 AM
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I have a Currie crate 9", the instructions recommend the gasket and RTV....so I complied
Same here- Currie rear and used schmoo and no paper, no washers. Typically I run a narrow bead around the housing inside the studs, then a small 'loop' around each stud, wait a minute or two, then drop in the chunk. If you used too much schmoo or the ooze bothers you, you can lick your finger and smooth it out, then squirt some color on it after it's dried. Always worked this way for me..
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post #9 of 17 (permalink) Old 05-10-2017, 10:55 PM
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Dont use Right Stuff if you think you may want to remove it.

I just use a gasket.
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post #10 of 17 (permalink) Old 05-12-2017, 05:33 PM Thread Starter
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Thanks everyone - since there are several with gasket-only success I am going to go that route.

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post #11 of 17 (permalink) Old 05-14-2017, 08:54 PM
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File Type: jpg rear2.jpg (71.6 KB, 20 views)
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post #12 of 17 (permalink) Old 05-14-2017, 08:56 PM
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I have a Currie crate 9", the instructions recommend the gasket and RTV....so I complied
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post #13 of 17 (permalink) Old 05-16-2017, 06:43 PM Thread Starter
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Looks great! What rear suspension are you running? I am running a RC Motorsports 4 link.

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post #14 of 17 (permalink) Old 05-16-2017, 07:04 PM
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Gasket ,
Silicone has a bad habit of getting into the bearings.

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post #15 of 17 (permalink) Old 05-17-2017, 08:05 PM
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Just make sure your mating surfaces are clean..

Most leaks I see come from failure to clean both the housing and the third member..

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