post #1 of Old 07-13-2007, 09:39 AM Thread Starter
Toddmw
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Transfer case ID

I just bought someone's exsisting Jeep project and I'm trying to ID the trasfer case. It looks like a NP231 (no ID tag) but the seller told me it's a Dana 300 with a 4:1 kit. It is not a Dana 300. The Jeep (87 YJ) originaly had a 4.2 and man. trans. but now hosts a 5.7 TBI chevy and 700R4. How can I verify the T-case and how can I verify the t-case gear ratio with the auto trans? I know one half of the case is changed with the 4:1 kits. Are there any markings the stand out on those new transfer case halves?

Here's what I CAN tell you:

Aluminum tranfer case
SYE (with tone ring for speedo)
Mated to 700R4
Driver's side front output shaft

Thanks for the help guys,

P.S. Is there another site that may possibly be a better help for tough tech questions?

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post #2 of Old 07-17-2007, 05:49 PM
Crashnburn80
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Cant help you ID the Tcase, but you can verify the 4:1 by seperating the Tcase from the trans, then 4 turns on the input shaft should equal 1 rotation of the output shaft. If you know the tranny gear ratios you can do the math and leave the tranny on.


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post #3 of Old 07-18-2007, 11:04 AM
Happy Joe
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The np207 that came with the 87 YJ looks very similar to a 231 but without the ID plate It is difficult to know for sure.
You can verify the gear ratio (as Crashnburn said) by shifting the case into 4 low and spinning the input shaft and counting the turns on the output shaft. (I believe that the 207 has a higher low ratio than the 231, by 0.11 turns on the output compared to the input, but I could be mistaken. I have a 207 on the floor of the shed that I could dig out if a pic would help). If it has a 4:1 kit you will know right away (4 tunes on the input for 1 turn on the output).
Enjoy!

Last edited by Happy Joe; 07-18-2007 at 11:24 AM.
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post #4 of Old 07-18-2007, 03:58 PM Thread Starter
Toddmw
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That kind of outlines my issue. I really didn't want to separate the trans and transfer case for some FYI info. With the auto trans. I don't know of another way. I know with the 4:1 kit it comes with a new case half but I don't know what those distinguishing features are.

Thanks for any and all help (or pictures),
Todd
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post #5 of Old 07-18-2007, 07:35 PM
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Does it look like this?

http://www.novak-adapt.com/knowledge/model_300.htm

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post #6 of Old 07-18-2007, 08:13 PM
StevenH
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Take a few pictures of it.
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post #7 of Old 07-18-2007, 08:15 PM
StevenH
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Quote:
Originally Posted by Trouble Maker
What d300 is drivers side drop? He said the case is aluminum.
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post #8 of Old 07-19-2007, 03:09 PM Thread Starter
Toddmw
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Quote:
Originally Posted by StevenH
What d300 is drivers side drop? He said the case is aluminum.
True,

It's a variety of, if not a NP 231.

One: I would like to know if it has the 4:1 kit

Two: I want to make sure I don't buy a 4:1 kit and have my current T-case be a NP 207 or something.

I'll try to grab some de-greaser on the way home, get it semi-clean, and snap a few pics. I know the case it dirrefent for the 4:1 gear kit but I don't know the outside features that are different between a NP231, 4:1 NP231, NP207, NP249, etc.

Thanks for the help,
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post #9 of Old 07-19-2007, 11:07 PM Thread Starter
Toddmw
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Okay guys not much to go on but I would say it's not a 4:1 case. I did a little crawling in it tonight and it doesn't seam that low plus both case haves have the New Process logo. C-16118 on the front and C-16117 on the rear. The only thing left to do now is verify the case model. It's had lots of wheeling on it so whatever it is must not be too weak or it would have broke by now. The last owner broke the 9" rearend and a driveline so whatever it's got is fairly tough,..........I guess.

Thanks,
Todd
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post #10 of Old 07-19-2007, 11:33 PM Thread Starter
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Okay all, last update

Date codes on the outside of the case range from 86 - 88 so that probably makes it an 1988 or later model (guessing here) NP231.

I found this :
Reference # 2
Part # 20357
Description NP231 Front Case Half, Sharp Tooth Ring Gear (C-16118)
Price $164.84

at www.southwestgear.com
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