Yes the rear driveshaft will need to be shortened when going from 249 to 242.
That will be the case irregardless of whether the 242 has the same rear yoke type as the 249 ? (Might be a dumb question; if so, sorry about that.)
And, I guess it costs around $100 to $200 to have the shaft cut-and-balanced ?
part-b to question: if I take-home the drive-shaft of the 242-jeep, then I can do a rear-drive-shaft-swap instead of cutting/balancing?
part-c to question: how much extra labor-cost does it cost to swap the drive-shaft as well (from the donor vehicle)?
Glancing at some numbers:
$200 for the t-case plus $xx for the bezel.
$30 gasoline to go pick up the t-case and get it home...
$60 for the linkage from Mountain Vista
$400 shop-labor for the t-case swapping work plus another $200 to cut-and-balance the old drive-shaft [guesstimation].
That totals to:
$890 + $xx (where xx is the bezel cost)
Comparing to replacing the viscous-coupler [VC]:
$386-shipped from Summit Racing (new coupler)
$YYY labor to swap the VC
If $YYY is about $500, the costs of the two approaches will be about the same.....................
And here I thought I was gonna get it all done for about $600 tops....