How to: extended diff breathers

[mookamatook]

Keep the hose runs as vertical as possible. I routed the rear up along the fuel filler hose to just behind the filler cap. For the front diff, I routed it up near the air box. For the t case and trans, I used a y-connector and routed them to one breather to the top of the trans dipstick.

So would you recommend routing the rear diff just out the gas filler cap without drilling through the filler cap cover? and not to the front engine bay/firewall where the ARB head (there are 4 ports that can be used up there) w/ filter would be attached? Any photos you may have of this install or just a few pics from under your rig with them installed and some fingers pointing to the diff lines if they are not obvious? I'm going to install these today so any help would be much appreciated!

Has anyone tried to route the diff breathers up through the air intake and through a snorkel? That sounds crazy/stupid just writing it but...you gotta ask the question right? It seems the higher the better when we are talking about water getting into the tube top.

 

[DDabs]

You're overthinking this exercise...

 

[mookamatook]

You're overthinking this exercise...

I have a tendency to do that Thanks for keeping me in check. Get them up and higher than their stock location. job done?

 

[BEG]

So would you recommend routing the rear diff just out the gas filler cap without drilling through the filler cap cover? and not to the front engine bay/firewall where the ARB head (there are 4 ports that can be used up there) w/ filter would be attached? Any photos you may have of this install or just a few pics from under your rig with them installed and some fingers pointing to the diff lines if they are not obvious? I'm going to install these today so any help would be much appreciated!

Has anyone tried to route the diff breathers up through the air intake and through a snorkel? That sounds crazy/stupid just writing it but...you gotta ask the question right? It seems the higher the better when we are talking about water getting into the tube top.

I didn't drill anything for the rear diff. The factory breather is obvious. It's a little stem with a cap sticking up from the drivers side axle tube. I removed it and popped on some clear fuel hose held in place with a spring clamp. I routed the other end up the drivers side quarter behind the fender liner. I used a cheap motorcycle fuel filter for the breather and zip tied the end up as high as I could to the fuel filler tube, just behind the filler but still behind the quarter panel.

I would definitely not route the rear diff all the way to the front. I know ARB and others design it this way so you have a snazzy single manifold in the engine bay but it's a poor design, IMO. Aside from having to route significantly more hose, you now have horizontal runs that can trap fluid and block the ingress/egress of air and negate any benefits of a breather. I used clear hose for this very reason: easy inspection in case anything other than air is going in or out.

Regarding routing through a snorkel, I think everybody has thought about it at some point. My thought is that a breather should be exposed to atmospheric pressure. No more, no less. Depending on where in the air stream you place the breather end, it's going to be affected by engine vacuum to some degree. Even then, I don't think it's worth the effort. Mine are all routed to the top of the engine bay. Even if I were to ford water that deep for some crazy reason, by the time I'm in that far the temps in the diff will have cooled off and the pressure will have equalized.

 

[mookamatook]

That was just the answer I was looking for. Thanks for taking time to explain! I'll route the rear diff up to the fuel filler line and the front diff, tcase, and gear box to the front manifold screwed into the firewall just below the hood about midway between driver/passenger of the vehicle. So 3 in the front and one to the rear fender wall behind the gas filler.

 

[SF1911A1]

I’m about to do this and am getting together all the materials. The original post said 5/8 hose and no one said otherwise in the thread. I just want to make sure that that’s the correct hose size because it looks significantly larger than what’s on my 99LX. Will 5/8 seal properly on the diff connection? Thanks.

 

[trdcorolla]

I just ordered 1/4" fuel line with a 1/2" diameter from the other breather extension thread.

 

[mookamatook]

definitely just cut the cap and extend the existing line from the rear diff. The front T case is easy to cut from the tranny fluid dip stick and reroute up to a higher location. It's the lower of the two on that dip stick IIRC. I haven't done the gear box yet. I have an 01 by the by...

 

[spressomon]

And...avoid horizontal breather line runs at ALL COSTS. Don't ask.

 

[mookamatook]

And...avoid horizontal breather line runs at ALL COSTS. Don't ask.

what he said ^^^ keep it on the up and up

 

[SF1911A1]

After 20 years y’all don’t think replacing the original rubber is necessary?

 

[Kofoed]

I just ran more hose and added a cheapo small engine fuel filter at the end. The end of hoe makes a U turn to point the filter inlet down ward. Freaking cheap and easy. No need to buy expensive factory breather. No way mine is intentionally going deeper than the gas cap door

 

[trdcorolla]

For those that extended the breather behind the tail light, did you use a 1/2" padded hose clamp with a self tapping screw to secure it? I was thinking a 1/2" screw should be long enough?

 

[BEG]

For those that extended the breather behind the tail light, did you use a 1/2" padded hose clamp with a self tapping screw to secure it? I was thinking a 1/2" screw should be long enough?

I don't think it's necessary to drill into the body. The OEM trailer converter box is mounted up there and it's only held on with double sided adhesive. You could probably just use a peel and stick zip tie cable mount to hold it in place.

 

[MACKSDAD]

Is 5/8” correct size? The hose on my dif now looks way smaller than rhis

 

[TriumphToys]

I had a friend do Very Similar w/o all the body holes by routing to engine compartment and out/up thru The external High Water Crossing Intake? He drilled 2 holes in the intake w/silicone sealant & grommets. I still say water over Your lap, in the seats is too damn much, but that's just me? More Importantly, Dad always said: "Drill Holes in the LEAST Expensive part(s)?

 

[TriumphToys]

Is 5/8” correct size? The hose on my dif now looks way smaller than rhis

That's because it IS Lots smaller (5mm, pretty close to 1/4"). I think he's referencing 5/8" for the outside diameter rather than inside?(But I have been wrong before & may well be now?)

 

[GVegasG]

Should the ID of the hose be 1/4?