So I had the afternoon off and I decided i might as well get the Rear Diff Breather mod done and out of the way. after reading a few others post I ordered the parts i needed last week.
I used this as my example to copy. Thanks Bob_98SR5
4Runners.org - Type R Rear Differential
Parts
Toyota Union Fitting- #90404-51319
Toyota Breather Plug- # 90930-03136
Just picked up 6' vacuum line from Autozone
2 hose clamps
Tools/Supplies Needed
14mm rachet socket
12mm rachet socket
Flat-bladed screwdriver
Xacto knife
a few zip ties
Others have lowered the spare tire for more room but I was able to get it done with out it. I just jacked up the rear by the tow hitch and put some jack stands under the hitch.
So I just laid on my back and unscrewed the stock breather. The hardest part was getting the new adapter screwed in. It was a pain in the *** from my back to get the threads to line up since i was going on feel only.
Then i just cut a hole in the rubber around the gas cap and slid in my hose til it came out the bottom. Maneuvered it to the diff adapter and hose clamped it on.cut the extra hose sticking out the gas door and put on my breather and hose clamped it. cleaned it up with a few zip ties and I was done. cost was prob around $30. Parts are only like $10 but it was $10 shipping. then hose and camps was around $5.
Its good insurance since my last truck I filled the tranny and diff with water a few times lol
As you can see the hole clamp keeps the hose from sliding back through the rubber. No other modifications are needed for that