[huk]

im guessing this is covered somewhere but thort i might ask anyway...
does my 92 sierra need diff breathers?
why are they important?
what kits/stuff should i get?
how hard are these to install? (im not very mechanically minded - thats why i love the sierra, nothing is too complex )
would appreciate any help

[Gwagensteve]

Yes, extended breathers are required.

In use, your diffs heat up. When you enter water, they cool rapidly and the air inside them contracts and draws in the outside environment through the breather cap on the diff housing. If you're in water, this means they draw in water, which causes havoc.

Do a search on what's involved in fitting them. The best method is to tap the existing breather with a 1/8 BSP tap and thread a barb in, then run oil resistant (I use low pressure fuel line) to a high point, normally up on the firewall.

Steve.

[AckerDackerly]

huk wrote:

im guessing this is covered somewhere but thort i might ask anyway...
does my 92 sierra need diff breathers?
why are they important?
what kits/stuff should i get?
how hard are these to install? (im not very mechanically minded - thats why i love the sierra, nothing is too complex )
would appreciate any help

If your Sierra is like the one they imported to North America, they already have "dif breathers". these mechanisms , found on the top side of the differential, allow air pressure buildup caused by the heating of internal parts and lubricants in the vehicle's axles. They keep the pressure from causing the bearing seals to leak.

Because the existing diff breathers can let air - and water - in as well as out, the openings need to be elevated to keep water out during high-water crossings.

So, what you need to do is to do what GwagenSteve suggested above to attach a suitable length of rubber tubing with a hose clamp so that, when you make a water crossing, the top of the tube will be above water exactly as a snorkel would do with the carburetor inlet. You also need enough tubing to handle any suspension flexing that may occur.

I hope that this helps!

[huk]

Cheers guys, very helpful!