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Author Topic: how to tell 21 spline or 23 spline 242 without removing?  (Read 5338 times)

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Offline demonicdragon

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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
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Offline Jurjen

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Re: how to tell 21 spline or 23 spline 242 without removing?
« Reply #1 on: August 07, 2012, 06:03:34 AM »
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Offline recomer

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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.
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Offline carnuck

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Re: how to tell 21 spline or 23 spline 242 without removing?
« Reply #3 on: 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.
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Offline demonicdragon

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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.
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Offline rollguy

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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?).
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Offline TheWraith

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Re: how to tell 21 spline or 23 spline 242 without removing?
« Reply #6 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.
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Offline rollguy

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Re: how to tell 21 spline or 23 spline 242 without removing?
« Reply #7 on: 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).
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Offline carnuck

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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)
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