if i were to break a birfield on a trail, how would i get home without a spair? do i drive it as is? do i have to do anything?
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If you leave the birf in and turning it can mess up your knuckle and damage the trunion housing (= new axle). Replacing on the trail isn't bad. There's a trick you can do by removing the felt wipers on the rear, undoing the steering arm, and popping the c-clip on the end of the birf, the whole knuckle (spindle, rotor, hub) will come off.
If you didn't have a replacement, I'd do what Kleirs mentioned. That will disable power to that wheel and won't spin the birf.
I would disagree with this as it does not address the spindle that goes into the trunion bearings.
Let's say you bust the ps birf. We all know the birf is in the front axle so no need to discuss front or rear. My suggestion would be to pull the birf and button her back up. Then drop the front drive shaft and drive home with the center diff locked. (Now, I don't know whether or not it would be ok to drive in three wheel drive so playing it safe in two wheel drive is why i stated dropping the d shaft) Now remember, if you don't have a center diff lock switch you will be driving home in 4 low. If you do have the swich and have done the pin 7 mod, drive as fast as you please.
Buck Buchanan
I would disagree with this as it does not address the spindle that goes into the trunion bearings.
Funny, that's how I pulled an axle apart two weeks ago to transport it, two complete knuckle assemblies and the axle housing.
Here's what you can do to the housing by driving with a broken birf.