Banjo Rearend Vent?

Rich/Alabama

Rich/Alabama

Member
Hi, I'm new to the forum and have a 40 with a stock banjo rear axle housing (3.54 gears) and yesterday after a drive opened it to check the oil level and pressure vented. All of the "modern" axles I have experience with have a vent somewhere but I can't find this one and my factory manuals don't have that info either. Can anyone help? Thanks in advance.
 
hey Rich, welcom to the Barn, if your car is stock you have no vent as modern axles have.
if you were to go with an open drive line then you would have to put the vent supplied with the kit and you would place the vent on the axle housing not on top of the banjo.
i am not sure what year the ford trucks started coming out with the open drivelines but i am also not sure if they were vented, someone else can school us on this.
rich
 
I put a vent in my closed drive line by pulling the tube off and drilling for a fitting to which I attached a fuel filter, to act as an air filter... Karl
 
In my 32 project w/open drive banjo I drilled and tapped into the driver axle tube, installed a fitting and put a "loop" into the vent tube (brake/gas line) to stop water and the like from getting in.
 
OK, that's what I needed to know. Kind of unusual that Ford didn't vent the housing somehow because there was a fair amount of pressure when I took out the fill plug. I may have to add a vent. Thanks for the feedback!
 
Rich/Alabama said:
OK, that's what I needed to know. Kind of unusual that Ford didn't vent the housing somehow because there was a fair amount of pressure when I took out the fill plug. I may have to add a vent. Thanks for the feedback!
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I wouldn't worry about installing a vent, unless oil is being pushed out, through the axle ends and leaking onto the brake shoes.
 
A vent is not needed on a closed rear. If pressure builds, it pushes oil up the torque tube, which then drains back into the banjo. Open drive banjos have the vent because there is nowhere for the oil to go, except down the bells.
 
On my 40 I drilled and tapped a hole on the top side of the torque tube between the banjo and the center bearing and installed a vent there.
 
If your would like to install a vent, what you can do is to remove one of the top bolts and drill a small hole the whole length of the bolt and solder in a small copper tube. It's an easy fix if needed.
 
Rich/Alabama said:
Hi, I'm new to the forum and have a 40 with a stock banjo rear axle housing (3.54 gears) and yesterday after a drive opened it to check the oil level and pressure vented. All of the "modern" axles I have experience with have a vent somewhere but I can't find this one and my factory manuals don't have that info either. Can anyone help? Thanks in athedvance.[/QUO the old rears didnt have vents
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I realize this is kind of primitive for an axle vent. However, it seems to work without creating a major leak problem. I just take a top bolt out of each side of the banjo and drill a 1/8" hole almost the length of the bolt. I finish the hole with a 1/16" bit. Again, it is super simple and seems to work.

Tom
 
If you have a built up pressure, it is someday likely to find a weak seal... Into brakes... Which is why I vented my closed driveline... I drilled a bolt, attached a piece of brake line- oil came out, lots... so I put it on the other side of the banjo. Same again... Next time I was doing something that got me close, I pulled the driveshaft housing off-cause I could clean it out- and put the vent in it... Karl
 
took the top bolt out and drilled it welded a hose fitting in it and ran a hose with a small filter like off a Jeep axle and theat worked since I have a Mitchell OD no torque tube to vent it normal
 
the vent is the extra hole in the face for the torque tube mounting. so the vent vents to the torque tube, and does carry some of the rear axle fluid with it, the oil from the vent and the bearing then drain back to the axle.
 
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