[SamUK]

Do you have a front diff lock or spool? That would make a difference.
I'd say if you had a 424 that you wouldn't get that effect so much either.

A few guys on here have 424's fitted along with front disc conversions, I'm sure his is an easy answer for them. I'll be interested as I'm planning on fitting discs upfront too.

 

[SamUK]

Hmm.. It must be caused by the CV's on the axles binding then. In theory it shouldn't happen but it obviously does. Have you given it a test run yet?