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how to tell 21 spline or 23 spline 242 without removing?

Started by demonicdragon, August 06, 2012, 06:25:39 PM

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demonicdragon

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

Jurjen

#1
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

recomer

#2
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

carnuck

#3
August 07, 2012, 01:30:19 PM
Quote from: recomer 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.
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!

demonicdragon

#4
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.

rollguy

#5
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)

TheWraith

#6
August 08, 2012, 07:43:00 AM
Quote from: rollguy on August 08, 2012, 12:49:16 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.

rollguy

#7
August 08, 2012, 06:27:40 PM
Quote from: TheWraith on August 08, 2012, 07:43:00 AM
Quote from: rollguy on August 08, 2012, 12:49:16 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 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)

carnuck

#8
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!
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