What size and thread type is the breather on a Sierras diff.
I have tried a metric bolt but the bolt is to small and the thread is wrong so think it may be imperial but what one? UNF, BSP , NPT.... Any ideas

I thought they were just push in fittings

mine is

The breather is a push in plastic tube. Do you mean the filler bolt?

Mine is just push in, although it does have a ridged look, (could be confused for a thread). If you have brocken the breather of? then you can drill and tap the plastic and tread a bit of brake pipe, it's what I had to do with mine, think the brake pipe threads 4mm can't remember. HTH Ray

On the Sierra 3.6 LSD the ribbed part the pipe pushes onto has Broken off and it's metal
On my new Quaife ATB the breather is missing with just a threaded hole where the breather should be, it's not a metric thread as far as I can tell so I get the feeling it is an imperial thread.
I have seen some mods used in racing using a banjo bolt and fancied fitting one

[Edited on 6/7/10 by snapper]