News: Putting FUN and FRIENDLINESS, FIRST into owning and learning about AMC small bodied cars, primarily Eagles, Spirits and Concords as well as vehicles built in AMC's Mexican subsidiary, VAM.

The AMC Eaglepedia can now be accessed using the buttons found below  This is a comprehensive ever growing archive of information, tips, diagrams, manuals, etc. for the AMC Eagle and other small bodied AMC cars. 

Also a button is now available for our Face Book Group page.


Welcome to the AMC Eagles Nest.  A new site under "old" management -- so welcome to your new home for everything related to AMC Eagles, Spirits and Concords along with opportunities to interact with other AMC'ers.  This site will soon be evolving to look different than it has and we will be incorporating new features we hope you will find useful, entertaining and expand your AMC horizons.

You can now promote your topics at your favorite social media site by clicking on the appropriate icon (top upper right of the page) while viewing the topic you wish to promote.


  • March 29, 2024, 07:14:34 AM

Login with username, password and session length

Author Topic: how to tell 21 spline or 23 spline 242 without removing?  (Read 4790 times)

0 Members and 1 Guest are viewing this topic.

Offline demonicdragon

  • Eagle Sundaancer
  • ******
  • Posts: 868
  • Thumbs Up 5
  • its cool cause you say its cool
    • My Cardomain site for my 85 Eagle
how to tell 21 spline or 23 spline 242 without removing?
« on: August 06, 2012, 06:25:39 PM »
how do you tell if a np242 is 21 spline or 23 spline without removing it from the vehicle? im doing the swap out with my 129 to this one

Offline Jurjen

  • AMC Eagles Den Addicted
  • ********
  • Posts: 3132
  • Thumbs Up 168
  • Dutch Eagle Preservation Front
Re: how to tell 21 spline or 23 spline 242 without removing?
« Reply #1 on: August 07, 2012, 06:03:34 AM »
"sparrows fly in flocks, eagles fly alone"

Eagle Wagon Limited 1983, Citroen C-Crosser 2010, Triumph Bonneville 1969, Yamaha XJR1300 1999, Yamaha TX750 1973

https://www.youtube.com/watch?v=Tf0jpiW6tRI

Click for Leeuwarden, Netherlands Forecast" height="90" width="160

Offline recomer

  • Eagle Sport
  • ****
  • Posts: 343
  • Thumbs Up 25
Re: how to tell 21 spline or 23 spline 242 without removing?
« Reply #2 on: August 07, 2012, 07:02:58 AM »
I've been reading a lot on this same subject and one of the statements I ran across said that easiest way to tell is by the transmission the 242 was attached to. If it was attached to a 4/5 speed manual it was a 21 spline and if it was attached to an automatic its a 23 spline. Still looking myself for more clarification on that.
83 Eagle Wagon

Offline carnuck

  • Having a 727 means never re-doing the trans again
  • AMC Eagles Den Addicted
  • ********
  • Posts: 3451
  • Thumbs Up 89
  • Near Seattle
    • Virtual Jeep
Re: how to tell 21 spline or 23 spline 242 without removing?
« Reply #3 on: August 07, 2012, 01:30:19 PM »
I've been reading a lot on this same subject and one of the statements I ran across said that easiest way to tell is by the transmission the 242 was attached to. If it was attached to a 4/5 speed manual it was a 21 spline and if it was attached to an automatic its a 23 spline. Still looking myself for more clarification on that.
08/90 and newer are all 23 spline behind the 4.0L and some with AX-15 (started in '89 in XJ/MJ) The V6 and 4 cyls were all 21 spline EXCEPT 3 speed auto (essentially the same trans as in Eagles, but different bell pattern)
   The 242 was unusual behind a std trans.
AMC/Jeep gauges are for amusement only. Any correlation between them and reality is purely coincidental!

Offline demonicdragon

  • Eagle Sundaancer
  • ******
  • Posts: 868
  • Thumbs Up 5
  • its cool cause you say its cool
    • My Cardomain site for my 85 Eagle
Re: how to tell 21 spline or 23 spline 242 without removing?
« Reply #4 on: August 07, 2012, 03:12:24 PM »
ok. so anything after 90 its a good chance its a 23 spline? sounds good. i dont have a yard that has anything to old around here thats worth getting parts off of.

Offline rollguy

  • Turbo Diesel Eagle
  • AMC Eagles Den Addicted
  • ********
  • Posts: 1797
  • Thumbs Up 84
  • Southern California
Re: how to tell 21 spline or 23 spline 242 without removing?
« Reply #5 on: August 08, 2012, 12:49:16 AM »
I am curious as well, as I am planning a TC/trans swap on one of my Eagles.  I have a Dana 300 in my SX4, and it bolts directly on the stock 998 trans.  I am planning to use the Dana 300 behind an AX15, and use the 242 I have (was behind the AX15) behind the 998 (engine, trans,242 going in another Eagle).  I am hoping everything is the same (23 spline?).
1980 Eagle Turbodiesel Wagon (only 2 known to exist as of 2008)- 7-7-2011 Flight to it's new nest @ Rambler Ranch
1983 Eagle Wagon  Tan over Copper
1982 Eagle SX4 "ALTREGL"  (avatar photo)
1982 Eagle 4 Door Sedan  Copper over Satin Black
1985 Eagle Sport Wagon October 2007 ROTM (SOLD)
4 Biofuel powered Benzs ('98 E300, '82 300 CD, '82 300 TD (wagon), '80 240 D)
1983 GMC Van (6.2 Diesel)
1985 Mitsubishi pickup (2.3 Turbodiesel)

Offline TheWraith

  • Eagle
  • **
  • Posts: 144
  • Thumbs Up 8
Re: how to tell 21 spline or 23 spline 242 without removing?
« Reply #6 on: August 08, 2012, 07:43:00 AM »
...I have a Dana 300 in my SX4, and it bolts directly on the stock 998 trans...

Not looking to hijack, but are you running a flipped d300?  Being a newbie to the Eagle, I thought it uses a drivers side front diff, and the d300 is a passenger side drop.  Just curious.
I am what Willis was talking about.

Offline rollguy

  • Turbo Diesel Eagle
  • AMC Eagles Den Addicted
  • ********
  • Posts: 1797
  • Thumbs Up 84
  • Southern California
Re: how to tell 21 spline or 23 spline 242 without removing?
« Reply #7 on: August 08, 2012, 06:27:40 PM »
...I have a Dana 300 in my SX4, and it bolts directly on the stock 998 trans...

Not looking to hijack, but are you running a flipped d300?  Being a newbie to the Eagle, I thought it uses a drivers side front diff, and the d300 is a passenger side drop.  Just curious.
I am running Dana 44's (passenger side drop).
1980 Eagle Turbodiesel Wagon (only 2 known to exist as of 2008)- 7-7-2011 Flight to it's new nest @ Rambler Ranch
1983 Eagle Wagon  Tan over Copper
1982 Eagle SX4 "ALTREGL"  (avatar photo)
1982 Eagle 4 Door Sedan  Copper over Satin Black
1985 Eagle Sport Wagon October 2007 ROTM (SOLD)
4 Biofuel powered Benzs ('98 E300, '82 300 CD, '82 300 TD (wagon), '80 240 D)
1983 GMC Van (6.2 Diesel)
1985 Mitsubishi pickup (2.3 Turbodiesel)

Offline carnuck

  • Having a 727 means never re-doing the trans again
  • AMC Eagles Den Addicted
  • ********
  • Posts: 3451
  • Thumbs Up 89
  • Near Seattle
    • Virtual Jeep
Re: how to tell 21 spline or 23 spline 242 without removing?
« Reply #8 on: August 16, 2012, 12:34:47 PM »
You will need the 1" spacer ring between the trans and tcase. AFAIK all AX-15s are 23 spline (even early ones that were BA 10/5 dealer replacements) All AX-4 or AX-5 are 21 spline (only 4 cyl and 2.8 V6 rigs)
AMC/Jeep gauges are for amusement only. Any correlation between them and reality is purely coincidental!

 

SMF spam blocked by CleanTalk