1986 CJ7 Dana 44 rear axle breather vent - JeepForum.com
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post #1 of 15 Old 01-13-2020, 09:19 AM Thread Starter
kiato4
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1986 CJ7 Dana 44 rear axle breather vent

Hi all, does anyone have pictures of the axle vent on a rear Dana 44 axle installed from the factory on a late 1986 CJ7? I am swapping this axle in to my own early 1986 (originally with AMC20), but I cannot find where to install the vent.

On the AMC20, there were two holes in the axle tube: one to hold the flexible brake line coming from the body tub, and another vent fitting for the breather.

Also, is it a push-on or threaded breather? Thanks in advance.

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post #2 of 15 Old 01-13-2020, 09:46 AM
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It is exactly like the model 20s. Separate vent tube sticking up out of the main tube about 5 inches away from the brake line junction block bolt hole

So it should be only one hole, threaded for the brake line bolt. Then, about 5 inches away, the rubber hose pushes down on a small vent pipe coming straight out of the axle tube. If you have just a hole, it broke off or is missing. It is pressed in just like the diff housing vent tube on the front Dana 30.

Ed
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post #3 of 15 Old 01-13-2020, 10:14 AM
schardein
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These should help. The brake junction block bolt is on the pass side tube closer to the pumpkin. The breather hose nipple is further out, actually just inboard of the pass spring seat.
Attached Thumbnails
Dana 44 002.jpg   Dana 44 003.jpg   IMG_3722.jpg  

1983 CJ7, 5.3, NV3550, D300 4:1, Fr D44 Detroit, Rr D44 OX, 4.56, 35" Falken A/T3W on beadlocks
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post #4 of 15 Old 01-13-2020, 12:38 PM Thread Starter
kiato4
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This is fantastic, thank you both for your help
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post #5 of 15 Old 01-13-2020, 08:25 PM Thread Starter
kiato4
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Any chance either of you can tell me the exact distance from the junction block to the breather? Looks like the last owner welded some shock mounts on the axle tube right where the breather was, so I need to re-drill and tap the exact location.
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post #6 of 15 Old 01-13-2020, 09:11 PM
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5 and 11/16” center to center

Ed
1975 CJ-6 1983 CJ-8
1986 CJ-7 Laredo 1986 TJ-7 Trail Jeep
2003 Inca Gold TJ Rubicon
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post #7 of 15 Old 01-14-2020, 07:54 AM Thread Starter
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Awesome, thanks again
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post #8 of 15 Old 01-18-2020, 06:24 PM
CSP
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You could drill and tap a hole anywhere you'd like. It's the same tube along the entire length, so it doesn't really matter where the vent is located.
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post #9 of 15 Old 01-19-2020, 09:48 AM
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I had the vent nipple on the front axle pull out, so instead of messing around, I just tapped the hole with a pipe thread tap and screwed in a nipple. No more pressed in type to come out again. Cover the tap with grease so it catches the shavings if you are worried about them getting inside. If you have it apart to rebuild, then no problem - tap it then clean it out.

Rick

1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy


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post #10 of 15 Old 01-19-2020, 10:20 AM
schardein
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Quote:
Originally Posted by Cutlass327 View Post
I had the vent nipple on the front axle pull out, so instead of messing around, I just tapped the hole with a pipe thread tap and screwed in a nipple. No more pressed in type to come out again. Cover the tap with grease so it catches the shavings if you are worried about them getting inside. If you have it apart to rebuild, then no problem - tap it then clean it out.
I've done this on damaged transfer case vent tubes.
What size pipe threads? 1/8 npt? Did you have to drill the hole or was it good as is?

1983 CJ7, 5.3, NV3550, D300 4:1, Fr D44 Detroit, Rr D44 OX, 4.56, 35" Falken A/T3W on beadlocks
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post #11 of 15 Old 01-19-2020, 10:21 AM
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I believe it was 3/8, I don't remember, but no, I didn't have to drill anything.

Rick

1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy


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post #12 of 15 Old 01-19-2020, 10:35 AM
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Quote:
Originally Posted by Cutlass327 View Post
I believe it was 3/8, I don't remember, but no, I didn't have to drill anything.
Probably 1/8.

1/8 npt is the size of most common old school oil pressure sending units. 3/8 npt uses a drilled hole slightly over 1/2".

1983 CJ7, 5.3, NV3550, D300 4:1, Fr D44 Detroit, Rr D44 OX, 4.56, 35" Falken A/T3W on beadlocks
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post #13 of 15 Old 01-19-2020, 10:42 AM
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That sounds right. It was 2 years ago or so, and I couldn't really tell you much about last week... I miss my 20yo self's memory...
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Rick

1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy


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post #14 of 15 Old 02-11-2020, 11:22 PM Thread Starter
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Quick update on this. I found the factory hole which was painted over. I ordered what I thought was the factory vent fitting (based on the parts catalog) and it is 7/16 NPT, and it looks much larger than what it should be. So I''m going with a 1/8 NPT fitting which seems to be close to the factory hole.
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post #15 of 15 Old 02-11-2020, 11:48 PM
CSP
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There's no such thing as 7/16" NPT. The factory fitting fits into a 7/16" hole, but it isn't threaded. It just has barbs that grab the edges of the hole as it's pressed in.

It just so happens that 7/16" is the correct hole size for tapping 1/4" NPT.
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