Cracked 9" 3rd member

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Dec 26, 2012 | 04:20 PM

tylerbailey1

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Cracked 9" 3rd member

Hey Guys,
I've got a cracked third member housing and I'm looking at getting it replaced with one from a junk yard.
Will any 9" third member housing work? Or do I need to know my bearing size?

1977 F-150 4x4

Dec 26, 2012 | 04:32 PM

HIO Silver

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From: NorCal

Confusion reigns with your terminology

Just call it an 9-inch axle housing.. not a 3rd member which refers to the pumpkin.

No, not any axle housing will work.. spring pads, shock mounts,etc can be different dimensions.. measure/verify perch to perch, OAL, etc...... get a housing out of a Dentside and verify your bearing size to reduce the likelihood of not getting the right one.

Dec 26, 2012 | 05:21 PM

NumberDummy

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From: Simi Valley, CA

1973 9's use the large ball type axle bearing, as do some 1974/79's. Some 1974/79's 9's have a tapered roller bearing/seal combination.

1974/79: There's no way to know which bearing type it has, an axleshaft has to be pulled to find out.

Dec 26, 2012 | 05:58 PM

tylerbailey1

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Its the actual third member (pumpkin) that is cracked, not my axle housing. I've got a locker in it that I am planning on keeping and putting in a new one.
I guess what I'm wanting to know is will my ring and pinion swap over without any problems into any new empty pumpkin??

Sorry for the confusion

Dec 26, 2012 | 06:11 PM

HIO Silver

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From: NorCal

Whoa.. exactly the opposite of what I thot you were saying.

A 9-inch carrier is a 9-inch carrier... yes... in the end, it all depends what it is stuffed with (28 vs 31 vs 35 spline internals).

Dec 26, 2012 | 06:17 PM

tylerbailey1

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OK great! Thats the answer I was hoping for. Thanks.

Dec 27, 2012 | 04:16 AM

NumberDummy

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From: Simi Valley, CA

No such thing as 35 spline axleshafts in any F100/150 w/a 9 inch. 1957/67 F100: 28 / 1968/72 F100 could be either 28 or 31 (w/a 9 3/8" ring gear) / 1973/83 F100 & 1975/86 F150 could have either 28 or 31.

35 splined axleshafts were used in mid 70's thru 1986 F250 Dana 60 rear axles.

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Jan 2, 2013 | 01:09 PM

tylerbailey1

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ok, so I've been shopping around for a new carrier and I'm finding some that come in different bearing size/bore diameter. I'm finding some that say they use a 2.89", 3.062", or a 3.25".
I'm planning on taking the gears out of my current cracked carrier and putting them in the replacement. And I can't just pull mine out and measure it.
Am I reading too much into this?
HIO Silver, you say a carrier is a carrier, but when I go to order one I see different options and I'm getting confused.
Sorry for my ignorance on the subject, but I really appreciate your help.

Jan 2, 2013 | 02:25 PM

#10

NumberDummy

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From: Simi Valley, CA

D7AZ-4141-A .. 9" Carrier Assy-Use with axle ratios from 2.47-1 thru 3.70-1.

1973/83 F100 / 1973/86 Bronco / 1975/86 F150 & E100/150 // 1973 Mustang / 1973/76 Torino/Montego / 1973/78 LTD/Marquis / 1973/79 Cougar/Ranchero/Thunderbird/Continental Mark IV & V.

1975/80 Granada/Monarch/Versailles / 1977/79 LTD II (not an LTD!).

Note: Many of these cars also came with 8 inch rear axles that look very similar to a 9 inch.

Jan 2, 2013 | 04:24 PM

#11

Sw1tchfoot

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From: Missouri

Quote:

Originally Posted by bamaf150

Is it true that the 31 spline axles are the ones with the two "dimples" marked in the center of the outboard end?

Here is a pic of my 1982, which should have 31 spline axles (I haven't pulled it). I however pulled a third member from another 1982 and it was in-fact 31 spline.

Jan 2, 2013 | 09:25 PM

#12

hasteranger

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From: West Virginia

best way to know is to pull the axle. you can make a good guess but you won't know for sure until you pull them. And they are pretty easy to pull, its like a 10 min job.

Jan 2, 2013 | 10:18 PM

#13

bamaf150

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Quote:

Originally Posted by Sw1tchfoot

Here is a pic of my 1982, which should have 31 spline axles (I haven't pulled it). I however pulled a third member from another 1982 and it was in-fact 31 spline.

Thats the same as mine. In another thread someone said the same thing today; these are the 31 spine axles, I dont know as Ive never had to pull one on the 3 half tons with 9'' I've owned.

Jan 2, 2013 | 10:48 PM

#14

hasteranger

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From: West Virginia

I'm pretty sure my 28 spline axles I pulled out of a used 9" housing I changed over to 31 spline were the same though. apparently I didn't take pics of them from that angle but I did take pics from a few other ones.