Swings and roundabouts on what you what and how much work you want to do with the car. Going the 220 turbo route, you have a lot more to think about and work to do. Yes is heavier, but has a lot more torque and power as standard.
Can't remember how it works. But my 220 turbo donor, had a ordinary 220 box with a normal diff in it. Will find out for sure once you pop a drive shaft out.
Another common problem with the 220 turbo box (Type A diff), is the bearing carrier breaks. I did not realise in the Marlin until I had the box apart. As you can see here, no way of the driveshaft connecting to the diff!
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