The five pictures below show the 1997-1998 Montero Sport V4AW3 transmission output shaft with the Mitsubishi 4 PPR reluctor ring. Note the keyway in the second picture. Don't do what I did and buy a shaft without the key (or loose it). I'm still looking for a replacement.
The three pictures below are of the 1998-2001 Jeep Cherokee 4WD 4.0L AW4 transmission output shaft and 4 PPR reluctor ring. Chrysler shipped a 4 PPR and a 16 PPR reluctor ring (at least that's what I've been told). I haven't seen a 16 PPR reluctor ring, so ....
Shown in the picture below is the difference between the Jeep output shaft on top and the Mitsubishi output shaft on the bottom. The '3rd', outer lock ring groove is missing on the Mitsubishi output shaft (see red arrows).
I have a pre-1998 Cherokee output assembly and I'll post pictures as soon as I have time. The differences between the pre-1998 and 1998-2001 Jeep assemblies were not clearly pointed out by anyone (or I'm just dense), so in a nutshell ...
The pre-1998 AW4 output adapter housing, output shaft speed sensor and reluctor ring:
1) The (Jeep) output adapter housing bolt patterns are the same on both sides, but the output shaft speed sensor and reluctor are totally different from their 1998-2001 counterparts. The parts are not interchangeable in any way. If you have a pre-1998 housing, you have to use the corresponding pre-1998 sensor and reluctor.
2) The pre-1998 output speed sensor/reluctor assembly is a 1 PPR setup, while the 1998-2001 sensor/reluctor assembly is a 4 (or theoretically 16) PPR setup.
3) The pre-1998 output shaft speed sensor and reluctor ring are completely different from later versions, and as far as I know are not even of the same type.
So, for anyone that's thinking of doing this, you need the following, all from a 1998-2001 Jeep AW4 (short snout 23-spline) ...
1) 23-spline AW4 output shaft with the third lock ring groove (and the half moon key)
2) Output adapter housing
3) 4 PPR reluctor ring and corresponding output shaft speed sensor (Chrysler calls this a 'Vehicle Speed Sensor', BTW. IT IS NOT the same as the actual VSS on the transfer case tail shaft housing.)
If there's no intention of using the output speed sensor stuff, the correct 23-spline output shaft and adapter housing are probably it.
Since I'm going to use a TCM (the PCS unit mentioned further up), I kinda need the output speed sensor functional.