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Unread 02-10-2016, 11:06 PM   #1
Triplemaxxx
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1997 TJ Wrangler 
 
Join Date: Apr 2009
Location: Sacramento, California
Posts: 44
1997 Jeep Diesel misc stuff

Ok, so a little back ground. I put together a 1970 DJ postal Right hand drive Jeep. It had a 4cyl Mercedes diesel/ax15 5 speed/dana300. Well after a lot of money and time, the Jeep wasn't practical because its a postal basically. Skipping a lot of detail...I knew I just needed a newer jeep as a starting point and knew I wanted round headlights lol. Don't tell the YJ guys I said that! Ok on with my post!

My basic goal is to have the transmission back bone stock. I have a 4cyl ax5 now. So I am stealing the ax15 and adapter from postal jeep. I have a om617 5cyl diesel. Some questions I have are:

Is the transmission cross bar the same between 4cyl and 6cyl models?
Is the driveshaft the same between 4 and 6 cyl models?
About the transfer case.....NP231...my 4 banger won't work correct?21 vs 23 spline right?
Any other thoughts are always welcome and if you know of someone or someone on this board that has done this diesel swap, let me know please. Just have random questions. Ive been down this road with my last jeep but any helpful insight just saves time. On my postal, I had no help and everything was trial and error since no one had done it to a postal jeep. Figure this time around id rather not reinvent the wheel

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Unread Yesterday, 04:04 AM   #2
mukluk
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2000 TJ Wrangler 
 
Join Date: Oct 2010
Location: Clyde, Texas
Posts: 1,843
Is the transmission cross bar the same between 4cyl and 6cyl models?
If by transmission cross bar you mean transfer case skid plate, yes they're the same. The skid changed to a deeper design with different mount hole offset in 2002 (AKA the "shovel" skid plate).

Is the driveshaft the same between 4 and 6 cyl models?
The front driveshafts for the stick shift are both the same I believe, the auto uses a slightly skinnier version in order to clear the trans. The rear driveshafts vary slightly in length, depending on the rear axle installed.

About the transfer case.....NP231...my 4 banger won't work correct?21 vs 23 spline right?
The 231 for the 4.0L (manual and auto) and the 2.5L w/auto used a 23 spline input, the 4 banger w/AX5 used a 21 spline. There are also some differences as to the length of the input as well depending on what year the case came out of if I recall correctly, a search on the subject should show up better details.
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Unread Yesterday, 08:03 PM   #3
Triplemaxxx
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1997 TJ Wrangler 
 
Join Date: Apr 2009
Location: Sacramento, California
Posts: 44
Thank you, that is what I needed! I can prepare with 2 of the 3 and then when motor and trans is all done, ill figure out the driveshaft. Thanks again!
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