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View Full Version : NP249J to NP242J Swap



Jeeprunner
10-19-2006, 08:28 PM
I just recently swaped the 249 over to the 242. I am having problems with a wining sound coming from the Tcase when I put it into any 4wd setting, sounds great when in 2wd. any hints on what i may have did wrong? I had to transplant the planetary gear from the 249 to the 242 because of the input shaft size difference....

BigDaveZJ
10-19-2006, 11:18 PM
What year is your rig and the donor rig for your 242? If one is before 94.5 and the other is after, the cut on the input gears is different and that could be leading to it.

rccolacc
10-19-2006, 11:30 PM
What year is your rig and the donor rig for your 242? If one is before 94.5 and the other is after, the cut on the input gears is different and that could be leading to it.
If the gear cuts were different, you would hear it in 2wd too. Trust me, I know from experience. When I swapped the whole planetary into my 231, it whined in 2wd and especially in 4Low. It was the gear cut difference.
Isn't there a differential or something in those 242s? Could it be whining?
-RC

fr3db3ar
10-20-2006, 06:59 AM
Could be the front output bearing :confused: