Welded diff - legal for road use?

[broken biscuit]

Bit of a debate - is fitting a welded diff to a road car legal? Car passed MOT with the welded diff fitted (advisory given for having a welded diff) and the diff is also down on the modifications list with the insurer specifically noted as 'welded diff'.

If this is not legal, what offence would you be committing? Google sheds no light...

[broken biscuit]

I've been advised that it could constitute 'using a vehicle in a dangerous condition' but can't find any references to prosecutions involving welded diffs under any offence

[broken biscuit]

Benbay001 said:

How did that conversation go?

It went 'Hello can you quote how much extra adding a welded differential and hydraulic handbrake to my car will affect my premium?'
'That will be £35 per year Sir, inclusive of admin fees'
'Please can I have this confirmed in writing?'

Email arrived in ten minutes. Specific amendment to add welded diff and hydraulic handbrake. Lass on the phone was a weekend drifter so knew exactly what I was on with.

[broken biscuit]

Yes. Cable handbrake retained. Hydraulic handbrake is fitted for drifting on track only.