i have a three door xr4i on a b reg. What lsd will fit straight on, without changing drive shafts hubs etc. do i have to open the diff up and change housing or does everything just bolt and plug straight in? does a saphire one fit etc, whats the easiest way, is it worth welding the diff or will that cause the car to many problems, what needs to be welded? i know nothing about rwd fords, i have always had rs turbos and xrs, i have a saphire cosworth now and im always a bit scared to power it out just cause its cost me so much bl**dy money, so i bought the xr4i cause it was going to be scrapped but the shell is solid, unfortunatley there is some dents and scratches and it does need a servo, but i thought it would be a perfect oppurtunity to have an every day sideways action Three door but with just one wheel spinning shes far to snatchy for smooth sideways driving like the cossie. please help me.