Thank you Blackwater and gto78 for your reply.
The extended breather tube is about 20 inches longer than the original and the catch can is doing the job. No more mess. I'll check the oil level (in catch can) soon.
I have changed the gear oil just prior to the aforementioned fix.
I have...
4x4 issues
My 97 had similar issues. It turned out to be the electric shift motor on the transfer case. The shift motor was no longer moving to the correct position as indicated by the switch on the dash and even tried to move to 4 low while on the freeway with no prompt from the dash switch...
I have a 1997 Expedition 4X4 that has been pushing gear oil out the vent tube on the front axle.
Ford recommends (TSB Article No. 97-10-10) new axle tube assembly part number F75Z-4K206-AA with vent tube relocated to the top front of the flange that mounts to the differential. I have also read...
Electric Shift Motor
I had the same problem with my 1997 Expo. and it turned out to be the Electric shift motor.
I think it unlikely to be the switch, however you can test the switch to be sure.
My OD light on the gear selector is out, could be yours is going out too.
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