It's my understanding that both those kits are nothing more than a hack-n-tap kit that they've already hacked and tapped for you?
Im not sure on the currie kit since ive yet to inquire about it bc i dont have the money for it yet
the TW kit's mainshaft is machined down so you dont have that lip left when you HnT- and yea its a modified stock shaft. the 242 shaft though is stronger than the stock 231 IIRC, and has a 32 spline front output.
Just wondering, but what are the steps to a front drive shaft conversion? I know you need an SYE, and a front drive shaft, but do you need to do anything other than lengthen the front shaft?
You shouldn't have to have the shaft lengthened, that's part of the whole point in using a used front driveshaft vs buying a new one.
As far as what else you need, it depends on if you do a hack-n-tap or a heavy-duty SYE. With a heavy-duty SYE, a front XJ shaft just bolts right up to it. With the hack-n-tap you've got to get an adapter flange (read link I posted above) and rebuild the double-cardan joint to replace the existing yoke adapter with the flange adapter.
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What about the double cardian joint where do you get that?
Its on a front shaft. A front shaft has 3 Ujoints. 2 at the Tcase, and one at the axle pinion/yoke. the 2 U joint configuration on one end of the shaft is called a double carden, somewhat like a CV(constant velocity) joint (but not really).