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Old August 16th, 2009, 06:43 PM   #1
mean_greenEXJAY
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Default Project "run what you brung" big block YJ

Plans are 89 YJ I just got, with a 425 big block cadillac, turbo 400, 203 t-case, and chevy 3/4 ton axles. All of this stuff besides the jeep I already had. Rear axle is a 14 bolt, planing to 4 link the rear with coilovers and 6-8" stretch. Front is just a 44 but will be spring over, will see where the stock springs sit with the 425. plan is to be pretty low and run 37s or more.

The jeep after I just pulled the drivetrain, I should have taken a picture when I just got it, has doors, hard and soft tops. It was rustier than I would have liked but the price was right. It will get a lot of body work and paint when all the cool stuff is done.

The engine is from a 76 deville that my brother did a demolition derby years ago, Its no 500 but it will do for now, I just hope it still runs

The transfer case I have no idea where it was from but I have two of them, It was behind a turbo 350 so the best way I figured to make it go to 400 was with this factory adapter I got from Bones a while ago and this 27 spline output shaft I got on ebay for $25, no idea what it was from because that normally is a custom shaft that goes for around $150. It is basically a 400 output shaft with the small splines from a 350.

Thats it for now, hope to be putting the trans and t-case together soon and work on motor and trans mounts.

Last edited by mean_greenEXJAY; August 16th, 2009 at 06:47 PM.
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Old August 16th, 2009, 07:55 PM   #2
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NP203's from behind TH400's aren't that hard to come by...I used to have one, but I sold it to Bones....ha.

Either way, the BOP TH400 would need a 4wd output shaft, so what you've got should be an economical setup.
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Old August 23rd, 2009, 06:45 PM   #3
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Originally Posted by 4Bangler View Post
NP203's from behind TH400's aren't that hard to come by...I used to have one, but I sold it to Bones....ha.

Either way, the BOP TH400 would need a 4wd output shaft, so what you've got should be an economical setup.
Yep, it was the cheapest way I could think of to do it and I doubt the small shaft will be that much of a weak link. I am glad I didnt toss this case for a one from a 400, just figured out this case has a part time kit so that is a plus.

I have been making some progress, I will get pics when the motor is in.
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Old August 28th, 2009, 07:36 PM   #4
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I was waiting to get some gaskets to tear into the trans to swap shafts, so I can get the whole powertrain together to start putting it in place. So I put the front axle in today.
Went in really easy, I even found a good spot for the shocks. I still have to figure something out for the steering and go figure I have chevy axle that didnt have a flat top knuckle in the pass side.
looks a little ridiculous with only the front axle in and SOA.
This is sitting level, a little higher than I want, hopefully the big engine will settle it down a lot.
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Old August 28th, 2009, 09:36 PM   #5
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a big block and that front axle...

i would look for a 60. i broke my knuckles off on ice with a 4.0. both sides
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Old September 18th, 2009, 08:59 PM   #6
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Put the back axle in, somewhat temporary because the rear frame will get a lot of work, but I just wanted it to sit level.
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Old September 18th, 2009, 10:16 PM   #7
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Quote:
Originally Posted by mean_greenEXJAY View Post


It is basically a 400 output shaft with the small splines from a 350.

That would be a Turbo 375, Had one in a 72 Catalina, imagine my surprise when I swapped transmissions and the driveshaft wouldn't fit.

http://www.nastyz28.com/chevy-transm...tification.php
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Old December 30th, 2009, 06:32 PM   #8
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Cut the motor mounts of, it no longer a 4cyl jeep.


Put the drivetrain together, it ends up to be really really long.

Getting the drivetrain set where it needs to be, that big old 203 is a pain to fit in a jeep.

The t-case isnt as high as I would like but it looks to be the best I can do with no body lift, or really cutting up the floor.

Since the cadillac motor does not have the distributor in the back like a chevy I was able to set the whole drivetrain back pretty far, but I think stretching the rear is mandatory, that would be a tough spot for a driveshaft

Since the drivetrain is where it needs to be I have to make the motor mounts and build a crossmember/skid plate. Then I should be able to get the engine up and running, the front driveshaft and steering set up and then it will be moving under its own power.
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Old January 10th, 2010, 05:50 PM   #9
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Got the motor mounts finished, they turned out very good, never got a picture before paint. Then I really went to town with the por15. I also got my twin sticks from offroad design.

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Old January 10th, 2010, 07:49 PM   #10
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that front end should settle down quite a bit with that big block, neat project cant wait to see more, it pushed my gm 14 bolt back 12 inches it worked out perfect with the 44in super swampers im running
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Old January 30th, 2010, 03:05 PM   #11
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I have been getting a lot of work done on this. First is the ORD twin sticks

Then here is the crossmember, I was going to have tube going across to the front and rear of that, and then skin it to make a belly pan, but it doesnt look like it will work like I planned so this is good enough for now

Then I had to work on the front driveshaft, I got a newer dodge driveshaft from the junkyard for $20. Has much bigger u-joints than the 1310s in an old chevy. See picture for comparison. Had to extended it a little, came out to be 43"

The only thing with the dodge driveshaft is that it had the 7290 u-joint, interestingly enough that u-joint has the same size cap as a GM S44 u-joint. I got a S44 yoke for a 10 bolt from the junk yard, milled it out a little bit to fit the inside clip width of the dodge joint. So for around $30 I have a pretty strong front driveshaft

Then here is a picture of the engine in there for good, working wiring and other things, should have it running pretty soon.


Last picture for this update, this is the radiator I got from superior radiator in mount clemens. 2 row all aluminum, bolted right in, all for $250. I was a little skeptical since is was so cheap, but the quality is great and it fit great, and I have no doubt it will cool any V8.
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Old January 30th, 2010, 04:29 PM   #12
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It's looking pretty good. Superior makes a great radiator too.
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Old January 30th, 2010, 04:39 PM   #13
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I might have to get a radiator like that.
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Old February 14th, 2010, 04:11 PM   #14
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I haven't had a chance to work on this in several weeks, But I did get these.
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Old February 25th, 2010, 04:47 PM   #15
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i just got a radiator from them today for my yj! they garenteed it for 700hp and the built in trans cooler up to a 3k stall converter. they did a super nice job!
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Old February 25th, 2010, 05:09 PM   #16
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i like where the spark plugs are located on the motor(above the manifolds) i have a real problem melting plug wires on the headers of my 383 small block chevy, that will not be an issue with yours,
nice work its comming together nicely.
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Old February 25th, 2010, 05:13 PM   #17
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Thanks, hopefully I can get some time to work on it this weekend, I should be able to get it running.
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