Are our front a rear axles salisbury type or is that only for defender's?

 

No they are not

 

what are ours?

 

I believe just an open differential

 

Indeed. Unless someone or you have changed the innards or installed an air locker, they are open. Thank God for traction control!?

 

When and only when the 3 Amigos are not on.

 

Stock Salisburys are open diffs also.
The Discovery I & II use basically the same Rover diff that's been in use in Rovers since the 50's at least.
NAS D90's have the same diff.
ENV front and rears were used in the IIA 1-tons, later IIA and SIII 1-tons had salisburys. 101's, D110's and other Rovers used the Salisbury. Not many used them in the front, though they were an option.
The Salisbury is essentially a DANA 60.

 

Lol, that's what black tape is for!

(no problems on mine in the 3 years I've owned it)
((really need to stop talking about my lack of problems before I jinx myself))