[K5 Blazer 1985] front differential leak?

[ChrisAwesome]

I drove on highway today, 55-60mph everything was fine. Then I accelerated a bit more to around 70-75mph and all of a sudden I got oil-burning smoke behind the truck. Stopped, checked underneath, everything was in oil, oil pan, transmission pan, transfer case, everything. I looked more and noticed that it could be that little tube that goes to front differential pissing oil around. Engine oil on the dipstick was fine, transmission oil on the dipstick was fine too. Rear diff also was perfect. I really had to keep going, so I kept driving <55mph and everything was fine later that day.

Could my front differential be spraying oil around when driving above 70mph?

Truck is on 35 tires. As far as I know my automatic locking hubs on front wheels are broken.

 

[K5wrench]

Did you check the power steering level?
Those hoses can spray a lot of fluid around.

If your front hubs are locked, let's say they are.. even at highway speed, i've never had diff oil come out the vent.
But it could be if the diff is overfilled.
That is hard to imagine happening because it would be hard to do by mistake.
I would have someone turn the wheel lock to lock and inspect the ps system for leaks.
Otherwise, clean the whole engine bay and under carriage with foamy engine bright and take another drive.
You'll find it after that.

 

[ChrisAwesome]

I haven't checked the power steering fluid, where do I find it? Does it have a dipstick?

 

[onetonbb74]

Its the pulley closest to the steering box, drivers side...check the pressure hose for sweating or leaks, its got compression fittings at the end of the hydraulic hose. The return is just oil line with hose clamps on each end.

 

[HankScorpio]

Gear oil will smell like Sulphur, the engine oil or power steering fluid will not.

 

[ChrisAwesome]

I identified the leak. It's my engine dipstick that gets pushed 2-3 inches out of its place and apparently while on higher RPMs (driving faster on highway) the engine oil exits. Then it drips onto turning shaft and messes up whole underbody.

So, how do I fix popping up dipstick?