azholmes21
NAXJA Forum User
- Location
- La Center, WA
I found a transfer case out of a '94 YJ and wanted to put it in my '99 XJ, well, I already put it in... unfortunately, the rear output shaft is a couple inches shorter and so when I went to test it out, it wasn't long before I heard the rear driveshaft fall to the ground. Do I have to take the T-Case back out and swap the output shaft (I really don't want to do that) or is there an extended yoke or something I could use to add about 1-2" of length to the driveshaft?
I also realized that the input shaft is a "short-input" as opposed to the "medium-input" on the AW4 (https://www.novak-adapt.com/knowledge/np-nvg-input-gears/). I am pretty sure the spline count was the same, again, I'm making an assumption because I was too stupid to check before putting it in, but it fit the shaft on the transmission and it worked in 2wd for the short distance I had tested it. Are the spline counts on these the same based on the specs below?
There's also a 4-prong Vaccum switch... Can I just leave this disconnected or do I need a vacuum to engage 4WD? I have no experience with T-cases w/ a vacuum switch.
Are there any other modifications that are necessary to make this swap work?
What I'm driving:
1999 XJ Sport 4.0L w/ AW4 and NP231J T-Case.
Specs for the transfer case I'm swapping out:
Model: NP231J
Assy: 5209-9212
Serial #: 929982C
Ratio: 272
Transmission: AW4
Specs for the transfer case I'm trying to swap in:
Model: NP231J
Assy: 5209-7535
Serial #: 322941
Ratio: 272
Transmission: AX15
I also realized that the input shaft is a "short-input" as opposed to the "medium-input" on the AW4 (https://www.novak-adapt.com/knowledge/np-nvg-input-gears/). I am pretty sure the spline count was the same, again, I'm making an assumption because I was too stupid to check before putting it in, but it fit the shaft on the transmission and it worked in 2wd for the short distance I had tested it. Are the spline counts on these the same based on the specs below?
There's also a 4-prong Vaccum switch... Can I just leave this disconnected or do I need a vacuum to engage 4WD? I have no experience with T-cases w/ a vacuum switch.
Are there any other modifications that are necessary to make this swap work?
What I'm driving:
1999 XJ Sport 4.0L w/ AW4 and NP231J T-Case.
Specs for the transfer case I'm swapping out:
Model: NP231J
Assy: 5209-9212
Serial #: 929982C
Ratio: 272
Transmission: AW4
Specs for the transfer case I'm trying to swap in:
Model: NP231J
Assy: 5209-7535
Serial #: 322941
Ratio: 272
Transmission: AX15