231/300 Combo - JeepForum.com
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post #1 of 26 Old 03-06-2007, 12:39 AM Thread Starter
doug_1994
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231/300 Combo

I never really wrote a full on writeup for my install. With the PM's Ive been getting, I figure I could put something together from the pics that I have. So here goes.

Getting the "kit". This is what I purchased from DD Machine (from here:http://www.pirate4x4.com/forum/showthread.php?t=451754)


Front plate (with Dana 300 clocking plate)

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4340 shaft, 23 spline

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Here is the NP231 that I had to buy (T18 and Dana 20 were in my YJ). Take the case apart. The back half can be pitched or sold. Then cut off the front lobe. I used a sawz-all. Used the "block off plate" as a guide (it comes in the kit).

Front.

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Back.

Note: The shifting fork and collar are not needed, and a new shift rail is included.

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Test fitting the front plate. to the NP231

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post #2 of 26 Old 03-06-2007, 12:50 AM Thread Starter
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Block off plate ground down to fit.

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All tigged in. I had a local propeller shop do it.

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Here is the NP435 I used. It was from a '79 ford.

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Novak adapter. http://www.novak-adapt.com/catalog/kit_431.htm

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New main shaft.

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post #3 of 26 Old 03-06-2007, 12:54 AM Thread Starter
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Tranny put together.

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New length just under 14"

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Mock-up together.

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Total length, just under 22"

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Last edited by doug_1994; 03-06-2007 at 01:36 PM.
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post #4 of 26 Old 03-06-2007, 01:00 AM Thread Starter
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The Dana 300

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The clocking ring now installed.

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Removal of the old T18 and Dana 20

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post #5 of 26 Old 03-06-2007, 01:08 AM Thread Starter
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The old T18/Dana 20. Great tranny, but it was the 4:1 first.

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Bellhousing from Advanced Adapter's. There are two more "adapter plates" still on the bellhousing. It was to "eat up" the long input shaft of the T18. A bellhousing from a T150 or T176 are the same as what I have. I did not know this four years ago when I did the T18 swap. It is typically known as the "butterfly" mount.

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New conversion pilot bushing from Novak's.http://www.novak-adapt.com/catalog/p...htm#amcengines

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New clutch from Napa. (not sure of the part#) If I recall correctly it is a 10 spline, 10" disk.

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Last edited by doug_1994; 03-06-2007 at 01:37 AM.
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post #6 of 26 Old 03-06-2007, 01:19 AM Thread Starter
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Old pressure plate from T18 install. It did have some heat marks, but I reused it anyways. I know some people will say I should of changed it, but oh well.

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Tranny is in. The only PITA was getting the old pilot bushing out. Once it was gone she slid home pretty easy.

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You can see my homemade slave cylinder bracket.

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Tranny mount from Auto Zone.

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All together now. I don't have pics of the skid plate install. I used the factory one, with some new holes drilled in it.
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Last edited by doug_1994; 03-06-2007 at 01:49 PM.
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post #7 of 26 Old 03-06-2007, 01:29 AM Thread Starter
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The only gripe I had on the whole install was the lack of support for the rear of the 300, and no real direction on which way to go. The tranny mount was way far ahead, and I thought the rear should be supported. So I improvised and made my own mount, outta some old poly bushings, tube, and plate. I tied it into my fifth link mount. Not gonna win any fabbin' contests, but it works.
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Last edited by doug_1994; 03-06-2007 at 02:12 AM.
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post #8 of 26 Old 03-06-2007, 01:52 AM Thread Starter
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With it coming up on a year, I still absolutly love it. The gear choice is amazing, allthough it did take some getting used to. Once I find the right gear, it is usually dead nuts on.

My gear choices are.

NP435~ 1st 6.68, 2nd 3.34, 3rd 1.74, 4th 1.00, and reverse 8.26

NP231~ 2.72:1

Dana 300~ 2.62:1

Axles (60,14)~ 4.10

Crawl ratio~ 195:1

Figure your own out here:http://www.novak-adapt.com/knowledge/gearing.htm


The total cost of this was some what manageable. I collected the parts for some time. Most of you prolly still have a NP231 in your jeeps now. Plus the fact that I had to adapt my tranny to the 231. So you are way ahead of the game.

The wheelbase was stretched to 110" using stock XJ springs all around. Also with some massaged perches.

Hope this helps, or open some eyes to the "double" lifestyle.

Doug

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post #9 of 26 Old 09-06-2008, 08:27 PM
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i love the write up but my favorite part was the rachet straps through the floor to lower the tranny,
The reason why its so funny cause me and my friends did the same thing puttin my tranny in 6' peice of pipe, 4 pulleys, and some rope les the 20 minutes my tranny was in,
Nice write up btw

1998 4dr XJ
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post #10 of 26 Old 09-06-2008, 09:53 PM Thread Starter
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^^^

Damn, first reply 18 months later!



I hear ya on the home-made "tranny jack". When you do things by yourself, you gotta improvise.

Thanks.

Wise men speak because they have something to say;
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post #11 of 26 Old 09-06-2008, 10:56 PM
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thanks doug!
i am about to get an xj, and considered the doubler route now i will have the wheelbase.
i can either do that, or install the atlas 4.3 i already have....
BTW, it already has a 231, and i already have a rebuilt 300......
opinions??

martin

1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover with a 6.0 LSx
1994 YJ, 4.3/700R4/OME SOA, etc
Western Star 4900EX 4 axle.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/f12/swap-offically-underway-324622/
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post #12 of 26 Old 09-06-2008, 11:16 PM Thread Starter
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^^^Your welcome Martin.


Hell, your got about all the hard parts allready.

I'd leave the Atlas in the YJ, and you may as well utilize that 300!


I guess it would all depend on your axle choice. I can't imagine stockers holding up to the deep gearing.

And, the 300 dumps to the passenger side, so that would need to be addressed. Flipped, or new front end.

Then you get into exhaust, gas tank(? maybe not in an XJ, dunno), driveshaft lengths, ect.

Whats the XJ gonna be used for?


Edit:

If the XJ is an auto (which I'm gonna guess it is) you may need to do something with the brakes also. I have a 60/14 front, and rear, with massive *** calipers, and drums. With this kind of gearing it pulls right through the brakes (1st gear,low,low). I have to push the clutch in to completly stop. But on the good side, I can about stall out, but still climb, at about 500 RPM with just riding the brakes.

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Last edited by doug_1994; 09-06-2008 at 11:26 PM. Reason: added more info
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post #13 of 26 Old 09-07-2008, 07:57 AM
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doug,
the yj is going mate, being traded for 2 xj's, 1 partially built. part of the deal is me keeping the atlas and dropping the 231c/j back into it.
i know all about braking problems, when i did the atlas in my junk, low range was about unstoppable. thats when i went with the dual diaphram booster.
700r4 + 4.3 atlas + 4.88's + 37's = cant stop on stock yj/8.8 brakes!!
stops fine now, finally...
and yeah, it is a 4.0 auto mate.
i can get the atlas in there for the cost of new input gear ($160), and then sell the 231 with sye. selling the old 231 will more than pay for the atlas to go in there IMO.
biggest i will go with it will be 35's. not decided on axles as of yet, but damn those jk rubi axles look like a good deal to me.
i was debating the (pretty much) new atlas vs the doubler arrangement already. will have to see what comes along i guess....
Martin

1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover with a 6.0 LSx
1994 YJ, 4.3/700R4/OME SOA, etc
Western Star 4900EX 4 axle.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/showthread.php?t=324622
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post #14 of 26 Old 09-07-2008, 08:19 AM Thread Starter
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With the stock AW4, atlas, and 3.55 gears (guess), you'd be at a 43 crawl ratio. With the 231/300 it'll bump it to a 71. Something else to chew on.

Wise men speak because they have something to say;
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post #15 of 26 Old 09-07-2008, 08:24 AM
leftlanetruckin
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gears would be 4.10 when the axles get done, or maybe 4.56, but i think the 4.0/aw4 with 35's will be happy with either one.
another thing to consider, it will be a semi dd for when the missus wants a change from the range rover, ok, when the kids wanna ride in the jeep then..... so looking nice n neat inside is a consideration too i guess.
decisions decisions......

martin

1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover with a 6.0 LSx
1994 YJ, 4.3/700R4/OME SOA, etc
Western Star 4900EX 4 axle.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/showthread.php?t=324622
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