If going with option 2, do you currently have a ford d60 in your possession? The 78-79 ford d60's usually fetch quite a bit of money (as I found out when looking for a ford d60 for my SAS). Sometimes GM d60's can be a bit easier and sometimes cheaper to find because there are more out there than 78-79 ford d60's.
If it were me, I would just convert the 4500 to be able to bolt up the GM NP241. Then you don't have to mess with re-engineering front axle or tcase. And for the uses you seem to plan with this thing, a 32 spline NP241 will be just fine. Plus, you could probably then do the build in a little more stages. Say get the motor/trans/tcase in there and running. Then lift it and redo driveshafts. Then work out the motor/tranny swap bugs (as we all know, there are usually always be a bunch). Then after it's running, then swap in a GM d60 after that.
But that's just my $0.02. Either option would get the job done and net good results.
If it were me, I would just convert the 4500 to be able to bolt up the GM NP241. Then you don't have to mess with re-engineering front axle or tcase. And for the uses you seem to plan with this thing, a 32 spline NP241 will be just fine. Plus, you could probably then do the build in a little more stages. Say get the motor/trans/tcase in there and running. Then lift it and redo driveshafts. Then work out the motor/tranny swap bugs (as we all know, there are usually always be a bunch). Then after it's running, then swap in a GM d60 after that.
But that's just my $0.02. Either option would get the job done and net good results.
