Jeep YJ 4BT Cummins build!! - JeepForum.com

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post #1 of 219 Old 05-23-2012, 09:50 AM Thread Starter
CumminsYj88
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1988 YJ Wrangler 
 
Join Date: May 2012
Location: nicholasville
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Jeep YJ 4BT Cummins build!!

hey guys thought i'd jump on jeepfourm and show y'all my yj build.im new to this site so bare with me.ive got a 1988 jeep yj it was 100% stock when i bought it at age 16.ive been slowly buying things for it,my plans are to drop a cummins 3.9l 4bt into it.so ill post some pictures of my build and how im going to do it.feel free to comment and give suggestions along the way

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post #2 of 219 Old 05-23-2012, 10:51 AM
reichard117
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2014 JK Wrangler 
 
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i wanna see this
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post #3 of 219 Old 05-23-2012, 11:16 AM Thread Starter
CumminsYj88
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1988 YJ Wrangler 
 
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Here's some pics of it before I started,I built the roof rack and put 12v forklift lights on the front.

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post #4 of 219 Old 05-23-2012, 11:32 AM Thread Starter
CumminsYj88
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1988 YJ Wrangler 
 
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Pictures of the tear down.it took me around 7 hours to take everything off,and another 2 hours to remove engine,trany,transfer,axles and other odds and ends.this yj had the 2.5 motor ax-5 trans,Dana 35 rear 30 front.I sold most everything on craigslist and set that aside for my 4bt.
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post #5 of 219 Old 05-23-2012, 11:35 AM Thread Starter
CumminsYj88
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1988 YJ Wrangler 
 
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Bought this 4bt on ebay for 2800$ it was rebuilt,and had a new cam shaft plus injection ve. Pump put on it.

forumrunner_20120523_123304.jpg
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post #6 of 219 Old 05-23-2012, 11:38 AM Thread Starter
CumminsYj88
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1988 YJ Wrangler 
 
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Bought this 2001 dodge nv4500 from ebay for 1,000.its was completly rebuilt and came with bell housing.

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post #7 of 219 Old 05-23-2012, 11:42 AM Thread Starter
CumminsYj88
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Here are the tires I'm going to be running 37/14.00-15 Irok bias ply,the rims are 15x10",6x5.5" mickey Thompson classic II black.

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post #8 of 219 Old 05-23-2012, 11:44 AM Thread Starter
CumminsYj88
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1988 YJ Wrangler 
 
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I don't have picture of my axles yet but,I've got Dana 44 front and rear out of a 88 waggy from ebay for 300.the rear has limited slip diff I'm going to be putting either 4.88 gears or 4.56.the front I'm thinking of a lunch box locker.I'm going to be springing over the axles myself.
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post #9 of 219 Old 05-23-2012, 11:49 AM Thread Starter
CumminsYj88
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Picture of 4bt and nv4500 the transfer case isn't in the picture but ill be using the stock np 231.ppl told me I couldn't mount the np231 to the nv4500,but I called up advanced adapters and they said they make an adapter input shaft for 180$.
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post #10 of 219 Old 05-23-2012, 11:56 AM Thread Starter
CumminsYj88
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Here's how she lays right now,grinded the frame down and she's ready to be sprung over,ill post pictures and details of how I'm going to do it along the way probably won't be for a couple weeks.if you have any questions please ask ill try to answer them.

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post #11 of 219 Old 05-23-2012, 12:17 PM
rmappelt
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This should be good...

"..or you can Jeep it if you got the nerve..." - C.W. McCall, "San Juan Odyssey"


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post #12 of 219 Old 05-30-2012, 04:49 PM Thread Starter
CumminsYj88
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Going to grind the rust off the axles do a little brake work,and fill it with new fluid.

forumrunner_20120530_174618.jpg
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post #13 of 219 Old 05-30-2012, 09:38 PM
Jeep4L1fe
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I was just thinking about this type of build the other day... glad to see someone is tackling it! Sub'd

1994 Jeep Wrangler YJ 2.5L
1995 Jeep Cherokee Sport 4.0
2012 Dodge Challenger R/T Classic HEMI
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post #14 of 219 Old 05-30-2012, 09:54 PM Thread Starter
CumminsYj88
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1988 YJ Wrangler 
 
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Thanks man,I think I bit off more then I can chew,but its slowly coming together.and when its done my dream jeep will be complete!
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post #15 of 219 Old 05-31-2012, 01:02 PM
twiisted71
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deja vu. to my build. '88 white wrangler with the same "Hmm, this is becoming more involved than I really intended" feeling. But hopefully it will be really fun when done.
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4bt , cummins , jeep , nv4500 , YJ

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