Reasonable quote???

[Plums]

Detroit lockers are street legal, as they still retain differential function.
I think you are referring to a spool (either full or mini-spool). Spools lock both axles together and are a real pain on the street, besides being illegal. Spools are great on the strip - had one in the Torana - but general street driving will cause an axle to break eventually. Many circuit cars use spools (eg. V8 supercars) because they are predictable and tough....

[400TT]

oops, yeah sorry, was thinking of mini-spool.

On the Gold Coast a standard test by Transport authority is to perform a circle on full lock. If you can do that without fuss from the back wheels you pass, if not, you go in for a full inspection.

[cameron02]

Regarding weight distribution on your DRB

My Weighbridge Ticket says 1140kg
Front 580kg
Rear 560kg

So unless you have some unusual setup I dont think weight is the problem for your rear end handling. Might be suspension?