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Unread 01-03-2006, 12:57 PM   #1
sdog30
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'94 GC rear diff question

Okay, I'm posting again. So according to my Haynes manual there's a junction block mounted to the top driver side of the axel tube on the rear differential (D35). The block has the rear brake line going in and left and right rear brake lines coming out. On top of this block is a breather and is supposed to have a tube attached. Mine is missing this tube.
My question is this: would a missing tube cause GL5 to spray all over the bottom of the chasis at high speeds or is it something else? I know it sounds like a stupid question, but I don't quite have a full grasp of how the breather works since there's also the breaklines running through the block too. Anybody have any experience with this?

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Unread 01-04-2006, 09:13 AM   #2
sdog30
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97 TJ 4.0Lw/5spd (the way god intended it)+33"+3.5 RE Superflex+RE Monotubes+GEN2 discos+BDS adjustable track bar
regretfully [COLOR="Red"][FONT="Impact"][SIZE="4"]*FOR SALE*[/COLOR][/FONT][/SIZE]
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Unread 01-04-2006, 09:44 PM   #3
jeepholic
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My brake lines are seperate from my breather. The breather tubes should go up into the body and yes if it fell off at the axle end (this is rare) it would spit gear oil. Gear oil smells really bad and can't be mixed up with brake fluid. Make sure it's not brake fluid and find someone else with a vehicle like yours and see where that tube goes.
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Unread 01-05-2006, 06:36 AM   #4
greasefingers
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I do not remember what the inside of the diff looks like exactly. It would be nice if they have a splash plate there just before the vent hole. But you can route a breather hose anywhere you want. Some move it to a higher location for traversing deep water. All it does is vent any oil vapor pressure build-up. This takes the pressure off of the seals and innards of the diff.

My front diff has a fitting onto of the diff for the rubber hose. The rear D30 or 35 ? only has a rubber bung. This severs as a drain, fill, & breather port. When I mean drain, I actually mean siphon port.
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Unread 01-05-2006, 08:23 AM   #5
sdog30
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Quote:
Originally Posted by jeepholic
My brake lines are seperate from my breather. The breather tubes should go up into the body and yes if it fell off at the axle end (this is rare) it would spit gear oil. Gear oil smells really bad and can't be mixed up with brake fluid. Make sure it's not brake fluid and find someone else with a vehicle like yours and see where that tube goes.
I just bought the GC a few weeks ago and the hose is completely missing. It's definately GL5 and it's all over the gas skid plate and the bottom of the driver side chassis above where the breather is. I wiped it down good and checked the fluid level (which was full) and drove around a little bit and there was nothing. Then I went on a 1 hour road trip on the highway and about 40 minutes later all you could smell was GL5 and it was smoking of the exhaust.
Soooo anyway, I was pretty sure it was because of the missing tube, but that seemed too easy. Wont the fluid just spray up the hose if I put it on? Is there a more serious problem I should look for that's causing the pressure? I have a limited slip and I'm thinking maybe if someone changed the fluid without friction modifier, maybe that would be part of the issue?
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97 TJ 4.0Lw/5spd (the way god intended it)+33"+3.5 RE Superflex+RE Monotubes+GEN2 discos+BDS adjustable track bar
regretfully [COLOR="Red"][FONT="Impact"][SIZE="4"]*FOR SALE*[/COLOR][/FONT][/SIZE]
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Unread 01-05-2006, 08:28 AM   #6
jeepholic
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Quote:
Originally Posted by sdog30
I just bought the GC a few weeks ago and the hose is completely missing. It's definately GL5 and it's all over the gas skid plate and the bottom of the driver side chassis above where the breather is. I wiped it down good and checked the fluid level (which was full) and drove around a little bit and there was nothing. Then I went on a 1 hour road trip on the highway and about 40 minutes later all you could smell was GL5 and it was smoking of the exhaust.
Soooo anyway, I was pretty sure it was because of the missing tube, but that seemed too easy. Wont the fluid just spray up the hose if I put it on? Is there a more serious problem I should look for that's causing the pressure? I have a limited slip and I'm thinking maybe if someone changed the fluid without friction modifier, maybe that would be part of the issue?
I believe the breather is 2 way, as in maybe the hole (axle side) is clogged and it is not breathing so the pressure builds up. I would start with the breather tubes, make sure they are on and venting up near the body.
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Big difference.

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