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np231 #837902 09/24/07 11:15 PM
Joined: Mar 2006
Posts: 272
Mitsulvr Offline OP
Mudrunner
I was wondering if the np 231 swap is just as doable in an 89 3.0 auto? If it is, have the seal isues been solved yet? I've done as much reading as I could today but have not found the answers.

Thanks in advance
Eric


Eric Wegerich
89 Montero as chopped as can be. Now with 5.29's
Re: np231 [Re: Mitsulvr] #837903 09/24/07 11:38 PM
Joined: Sep 2001
Posts: 8,557
LandRaider Offline
Forum Moderator
*****
yes <img src="/forums/images/graemlins/smile.gif" alt="" />


87 Raider 4D56td v5MT1
31's..Basically Stock
Re: np231 [Re: Mitsulvr] #837904 09/25/07 12:17 AM
Joined: Apr 2002
Posts: 3,622
NathanC Offline
Roll Me Over
Holy cow! I wouldn't even call the seal an issue. Get a 23 spline "medium" length shaft if you can find it. Worst case, get a long spline and cut a bit off the end of the shaft.

The seal is easy. Measure the OD of the seal, measure the OD of the t-case input shaft and that will tell you the ID of the new seal. Go to an industrial bearing supplier and give him those specs and find one the same width as the old one. If you can't measure the stuff, bring the parts in and have them measure them for you!

Worry about making new driveshafts and a new t-case shifter. <img src="/forums/images/graemlins/kewl.gif" alt="" />


'06 Dakota QC 4.7 6sp 4x4
'88 Mighty Max
'77 KZ1000 fun old bike
Re: np231 [Re: NathanC] #837905 09/25/07 03:51 AM
Joined: Mar 2006
Posts: 272
Mitsulvr Offline OP
Mudrunner
Thanks guys. I never thought of that about the seals. One more question, Is there an easy way to tell what shaft the t-case has?


Eric Wegerich
89 Montero as chopped as can be. Now with 5.29's
Re: np231 [Re: Mitsulvr] #837906 09/25/07 11:36 AM
Joined: Apr 2002
Posts: 3,622
NathanC Offline
Roll Me Over
Not really. Here's a couple links to help, but realize there really is no rule for the input shaft.

Novak Conversions

Here's another one that sort of helps: Drivetrain.com
Scroll through the list for Jeep vehicles.

The most important thing is that you have to verify the length of the input shaft as well as count the splines for yourself. <img src="/forums/images/graemlins/kewl.gif" alt="" />


'06 Dakota QC 4.7 6sp 4x4
'88 Mighty Max
'77 KZ1000 fun old bike
Re: np231 [Re: NathanC] #837907 09/25/07 12:29 PM
Joined: Sep 2006
Posts: 406
Y
yankneck696 Offline
Mudrunner
This won't work for an 89 5 speed, right?

Ed


Yankneck = Yankee ingenuity with Redneck stupidity.
"How can I break it better?"
89 Raider 3.0 w/ 31's for now
Re: np231 [Re: NathanC] #837908 09/25/07 02:19 PM
Joined: Jan 2000
Posts: 7,309
PHIL_ Offline
Trail Leader
*****
Thanks Nathan. I'll have to help him all I can on this one, since we are talking about the truck formerly known as Betsy III! <img src="/forums/images/graemlins/smile.gif" alt="" />


1991 HZJ77, 1999 KZJ90, 1999 UZJ100, 1992 M101CDN2
https://www.thegearheadproject.com/category/jdm-journeys/

Re: np231 [Re: Mitsulvr] #837909 09/25/07 08:28 PM
Joined: Apr 2003
Posts: 1,393
ForcedAir_Montero Offline
Body Damage is Cool
So who's actually completed this and running a 231?
I've lost track of this and kind of dropped the ball when we lost Matt aka Wyleone.
My case and new input shaft are still sitting here....


-Dave D
Reservoir of Useless Knowledge

"But... If I kill all the golfers, they'll lock me up, and throw away the key..."
-Bill Murray

'84&change Monty MPI Turbo, choptop, f&r lsd, swapped in AT- All the goodies!
Re: np231 [Re: ForcedAir_Montero] #837910 09/25/07 10:05 PM
Joined: Mar 2006
Posts: 272
Mitsulvr Offline OP
Mudrunner
I've found three 231's to play with so we shall see. Although it looks like my 2.85's may be coming back now as well so now I'm not sure. <img src="/forums/images/graemlins/frown.gif" alt="" /> But I'll try to fit one either way just to see for everyone.


Eric Wegerich
89 Montero as chopped as can be. Now with 5.29's
Re: np231 [Re: ForcedAir_Montero] #837911 09/26/07 12:48 AM
Joined: Apr 2002
Posts: 3,622
NathanC Offline
Roll Me Over
Quote
So who's actually completed this and running a 231?
I've lost track of this and kind of dropped the ball when we lost Matt aka Wyleone.
My case and new input shaft are still sitting here....


I'm running two of them in a row. <img src="/forums/images/graemlins/smile.gif" alt="" />

No one to my knowledge has done it with a Gen1. I posted some pics a while back showing one held up to a KM148.


'06 Dakota QC 4.7 6sp 4x4
'88 Mighty Max
'77 KZ1000 fun old bike
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