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Unread Yesterday, 10:29 AM   #1
vespo94
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1988 YJ Wrangler 
 
Join Date: Mar 2015
Location: St. Marys, Georgia
Posts: 5
1988 YJ Wrangler 4bt swap

I have a stock 1988 yj wrangler 2.5L 4cyl 5 speed trans with a 4" lift. Looking to swap it with a 4bt cummins and nv4500 transmission. Just looking for tips on this build, and what mounts and other necessary parts to get and where to get em. I have the skills and tools necesssary, just would appreciate some help. I will post pics and write ups as i progress.

-Vince

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Unread Yesterday, 10:38 AM   #2
y2k-fxst
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1964 CJ6 
 
Join Date: Sep 2012
Location: North English, Iowa
Posts: 251
Do a search here on 4bt's there are a few already. Also make sure you poke around http://www.4btswaps.com lot of good info there. If you are not inclined to build your own mounts there is a member on here that sells Farm Strong motor mounts. Not a fan of the fluid mounts from the bread trucks or the ones from Jeff Daniels either for anything that will be used off-road.

With 33" tires you will not want much greater than 3.55 gears especially for the street.

Just remember this is a very large heavy motor. Make sure your axles are up to the challenge!

Good luck on your build, I'll be watching.
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Unread Yesterday, 12:21 PM   #3
vespo94
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1988 YJ Wrangler 
 
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Location: St. Marys, Georgia
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I was planning on running 3.73 gears it's gonna be more for offroading. What axles would you recommend?
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Unread Yesterday, 02:30 PM   #4
vespo94
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1988 YJ Wrangler 
 
Join Date: Mar 2015
Location: St. Marys, Georgia
Posts: 5
Also for anyone who may have done this sort of swap, what would be a good donor truck to get for axles and random little parts and such?
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Unread Yesterday, 04:58 PM   #5
y2k-fxst
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1964 CJ6 
 
Join Date: Sep 2012
Location: North English, Iowa
Posts: 251
Axle choice comes down to tire size, and intended use. I'm running a Dana 44 front and a Ford 9" rear, not planning anything over 33" tires and only mild to moderate trails. Anything very technical for trails or larger tires you'll be looking at one ton axles.

Don't forget search function is your friend here. While this forum is more tolerant than one's like Pirate, people here are still not going to hold your hand. Need to really read and start planning. I started reading/researching about 2 years prior to even starting to purchase parts.
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Unread Yesterday, 05:42 PM   #6
vespo94
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1988 YJ Wrangler 
 
Join Date: Mar 2015
Location: St. Marys, Georgia
Posts: 5
Thanks man appreciate it. Not planning on anything bigger than 33"
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