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View Full Version : NP231 T-case w/ AA SYE



1toughxj
12-11-2006, 07:54 PM
I have the 231 out of my 2001 Cherokee available for sale. It has the Advanced Adapters SYE installed. Looking for $250.

vwkaferman
12-12-2006, 06:41 PM
I might be interested. I'm looking into doing the TnT front long arm, and am going to need a SYE. Obviously I'll need a longer drive shaft, I take it I need to lift mine more, measure, and order a new drive shaft specific to the lift? Newb question, I know.

Not too far from ya, might not be a bad idea to pick that up. I take it it doesn't leak and all? How many miles on it? Thanks!

James

1toughxj
12-12-2006, 08:13 PM
Yeah, your best bet is to lift first then measure. I pulled it off of my XJ around 80K, as far as I know it never leaked. Let me know.

cptmax
12-14-2006, 03:53 AM
I've got a 1991 YJ with the 4.0 and an AX15. Do you know if this 231 would fit it? If so, I would like to buy it.

Max

1toughxj
12-14-2006, 07:19 AM
Just did some research on Novak's website and it looks like it's the same unit for the AX-15. Here is the link: http://www.novak-adapt.com/knowledge/np231.htm

Let me know.

cptmax
12-14-2006, 04:33 PM
The Novak site states that the same 231 was used with tranny's from '88 to 99. I'm thinking that since your Jeep is a 2001, it wouldn't fit. I'll do some more checking around to see if it WILL fit. I really hope it does!

Does your Jeep have an AX-15 or AX-5?

Max

1toughxj
12-14-2006, 04:52 PM
It will fit, the transfer case I installed was a 23 spline as well. My tranny is an AW-4.

cptmax
12-14-2006, 04:57 PM
Does your's have the speedo cable or electonic?

1toughxj
12-14-2006, 05:57 PM
Mine has the electronic sender.

cptmax
12-14-2006, 05:59 PM
I have the cable so I don't think it will work. I kinda need to know how fast I'm driving!
I need to find out if there's a way to make it work. I have a '91 YJ.

RT8827
12-16-2006, 02:19 PM
I have the cable so I don't think it will work. I kinda need to know how fast I'm driving!
I need to find out if there's a way to make it work. I have a '91 YJ.
The speedo sensor housing should swap right over from your '91 NP231 to the '01 NP231. The '91 had both an electronic signal (for the PCM/computer) and cable (for the speedometer). Beginning in '92, they were all electronic because the speedometer gauge changed from mechanical to electronic. So if you swap your speedo sensor housing, which takes all of 2 minutes, you'll retain both the mechanical and electronic feeds that you need for your '91 YJ.

My primary concern, if I were you, would be the length of the NP231 input shaft. Even though both of these NP231's are 23-spline, the "stick-out" of the input shaft is different, and I don't know if it would cause a problem.

Another thing to consider is your vacuum actuator for engaging the passenger-side axle in 4-wheel-drive. This is done via vacuum on the YJs, unless you've changed it to mechanical/cable (like the $150 Posi-Lok). Your '91 NP231 is connected to the D30 vacuum actuator, and the '01 XJ NP231 (like all TJ NP231's) will not have this vacuum hook-up/port.

Good luck! :)

1toughxj
12-16-2006, 04:53 PM
SOLD to a NAXJA member.

cptmax
12-18-2006, 06:34 PM
The speedo sensor housing should swap right over from your '91 NP231 to the '01 NP231. The '91 had both an electronic signal (for the PCM/computer) and cable (for the speedometer). Beginning in '92, they were all electronic because the speedometer gauge changed from mechanical to electronic. So if you swap your speedo sensor housing, which takes all of 2 minutes, you'll retain both the mechanical and electronic feeds that you need for your '91 YJ.

My primary concern, if I were you, would be the length of the NP231 input shaft. Even though both of these NP231's are 23-spline, the "stick-out" of the input shaft is different, and I don't know if it would cause a problem.

Another thing to consider is your vacuum actuator for engaging the passenger-side axle in 4-wheel-drive. This is done via vacuum on the YJs, unless you've changed it to mechanical/cable (like the $150 Posi-Lok). Your '91 NP231 is connected to the D30 vacuum actuator, and the '01 XJ NP231 (like all TJ NP231's) will not have this vacuum hook-up/port.

Good luck! :)

Just to let you know, I found out that the input shafts are NOT compatible, so it wouldn't have worked anyway. I was not aware of the fact that the sensor housings were compatible. Thank you for that!