Originally Posted by black97grand
Is that shaft part of the viscous coupler?
No the input shaft that slides into the trans is a separate piece from the VC. You have to take the TC apart and either put the the input shaft from your 249 into the donor 249 or just take the VC from the donor to put in your case which IMO would be the easier way to go.
Also how many miles are on the donor case? If its over 100k you might just want to go to the NP 242 or 231 because most VCs go bad at about 150k.
I did the 242 and love the results.