Official 4.0 swap thread - Page 16 - JeepForum.com

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post #226 of 429 Old 01-08-2009, 02:38 PM
Stan99
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1978 CJ7 
 
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Just one quik question. I have done alot of reserch on what I have. The question I have is do I have to run the 4.0 starter if I am running a AX15? I have found conflicting answers on this. Before I put it in I matched up the flywheel from my TH400 and the ax15 one and there was no difference. My starter for the TH400 is brand new. Do I need to replace it?

My set up......

258, 4.0 head, intake and manifold, ax15 tranny, clutch and flywheel


1978 Jeep Cj7 Soa, Shackle Reversle, 36x13.5x15 Irocks, 4.5 Stroker MPI, Dana 300 twin Sticked, 4.88's
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post #227 of 429 Old 01-08-2009, 03:04 PM
Last Boyscout
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The way I under stand it is you have to run the starter that matches the flywheel you are using. And why would you replace a TH400 with an AX15?

STEP 1: BUILD IT!
STEP 2: BREAK IT!
STEP 3: REPEAT!!!!!
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post #228 of 429 Old 01-08-2009, 05:20 PM
Stan99
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The TH400 was had a big whole in the side. And I wanted to go with a stick on the rebuild so I found this one and was an easy swap with the dana 300. I also picked up an sm420 but after driving a buddys jeep with it, it went straight to the shed.

Do you know if there is a difference between the two flywheels?

1978 Jeep Cj7 Soa, Shackle Reversle, 36x13.5x15 Irocks, 4.5 Stroker MPI, Dana 300 twin Sticked, 4.88's
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post #229 of 429 Old 01-09-2009, 04:04 PM
Last Boyscout
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There is a huge difference between the TH400 and AX15. The TH400 is an automatic and uses a flex-plate. The AX15 is a manual and uses a fly-wheel. A flex-plate and fly-wheel are not interchangeable. They shouldn't even look alike. I'm a little confused.

STEP 1: BUILD IT!
STEP 2: BREAK IT!
STEP 3: REPEAT!!!!!
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post #230 of 429 Old 01-09-2009, 04:19 PM
Stan99
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I am talking about the difference in the tooth pattern. I know the differences in everything else. But when I put the two up to each other (flex plate/flywheel)the pattern looked exactly the same.

I gues I am stuck getting a new starter. Anybody need a new CJ7 starter?

1978 Jeep Cj7 Soa, Shackle Reversle, 36x13.5x15 Irocks, 4.5 Stroker MPI, Dana 300 twin Sticked, 4.88's
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post #231 of 429 Old 01-09-2009, 05:54 PM
Last Boyscout
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you can use a CJ fly-wheel w/ the AX15. The starter has to match the Fly-wheel not the Tranny. You can try the AX15 fly-wheel w/the starter but be ready to take it apart if it does not engage. I would contact NOVAK w/ this question. They are the authority on Jeep Tranny conversions.

STEP 1: BUILD IT!
STEP 2: BREAK IT!
STEP 3: REPEAT!!!!!
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post #232 of 429 Old 01-22-2009, 09:12 AM
Kman1983
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Adjusting the BBD for the last time...
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post #233 of 429 Old 01-25-2009, 06:53 PM
clintb
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4.0 to CJ power steering pump problems

I have a 4.0 put in an 80 CJ7. The installer put the vbelt pulleys on but the power steering pump is missing. Engine has a clifford manifold and I have a cherokee pump and bracket. I am having trouble finding a pulley to put on this pump to match the available grooves. Does anyone have a suggestion for a vbelt pulley. The two groove one from the standard ps has too much offset. I need one that has virtually no offset. Would appreciate any ideas about source for pulley or other options.
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post #234 of 429 Old 01-27-2009, 01:14 PM
gdepley
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OK! Now that I have a headache from scrolling through this whole thread,I don't think I saw anyone with a 4.0 out of anything newer than a 99. I have a 4.0 out of an 04 wrangler with 23k miles on it but no cpu or harness. Jeep was a wreck that broke motor mounts on block. I paid $200 for it but having trouble finding the parts I need. Leaning towards ford 302 but would like the FI 4.0. Any suggestions?
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post #235 of 429 Old 01-27-2009, 07:07 PM
whittlecj
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I'm working on a swap with a 2002. You can find some info on the modern style on cjoffroad. You can ask and I'll try to help with what you need but I'm not exactly finished yet!

______________________________________
In Process: 2002 4.0L and NV3550 Swap
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post #236 of 429 Old 02-05-2009, 11:50 AM
Stan99
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I posted this question on my build thread and havnt got any response. What would be the best muffler to run on my set up. I want it to perform good but the main thing is that I want it quit!!!!! The 258 isnt the best sounding engine and I dont know if the 4.0 head, intake and header are going to change that. What would be my best bet?

Here is my build thread....

http://www.jeepforum.com/forum/showt...=675649&page=2

1978 Jeep Cj7 Soa, Shackle Reversle, 36x13.5x15 Irocks, 4.5 Stroker MPI, Dana 300 twin Sticked, 4.88's
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post #237 of 429 Old 02-19-2009, 03:20 PM
Last Boyscout
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Quote:
Originally Posted by Kman1983 View Post
I need to keep: headlights, horn, oil pressure and water temp if I'm correct.
What gauges bare you using? The CJ gauges will not work with the 4.0 sending units. Wrong ohm readings.

Quote:
Originally Posted by clintb View Post
I have a 4.0 put in an 80 CJ7. The installer put the vbelt pulleys on but the power steering pump is missing. Engine has a clifford manifold and I have a cherokee pump and bracket. I am having trouble finding a pulley to put on this pump to match the available grooves. Does anyone have a suggestion for a vbelt pulley. The two groove one from the standard ps has too much offset. I need one that has virtually no offset. Would appreciate any ideas about source for pulley or other options.
Photos At
http://s472.photobucket.com/albums/rr84/clintb00/
I’m trying to understand why your installer put CJ pulleys and accessories on the 4.0. Unless you did not have the accessories or pulleys for the 4.0. It would be easier to get a CJ pump than trying to modify the XJ pump. What steering gear are you going to use? CJ or XJ?

Quote:
Originally Posted by Stan99 View Post
I posted this question on my build thread and havnt got any response. What would be the best muffler to run on my set up. I want it to perform good but the main thing is that I want it quit!!!!! The 258 isnt the best sounding engine and I dont know if the 4.0 head, intake and header are going to change that. What would be my best bet?

Here is my build thread....

http://www.jeepforum.com/forum/showt...=675649&page=2
contact Magnaflow and other manufactures tell them what you want and get their expert advise.

STEP 1: BUILD IT!
STEP 2: BREAK IT!
STEP 3: REPEAT!!!!!
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post #238 of 429 Old 02-19-2009, 03:34 PM
Last Boyscout
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Quote:
Originally Posted by Kman1983 View Post
This may have been covered, can I install the extra YJ fuel tank/pump assembly in my CJ? I need a 4.0 YJ fan (opposite rotation than CJ, correct? Looking at ordering the Napa #EXH44565head pipe and #BSH15704 O2 sensor.
Yes you can use the YJ tank and pump. Just flip it 180 degrees to correct the filler neck position. If your CJ did not have a serpentine belt you will need a reverse rotation fan. I just took my CJ to a small exhaust shop. They used my muffler and bent and routed all new tubing for $100 cash.

STEP 1: BUILD IT!
STEP 2: BREAK IT!
STEP 3: REPEAT!!!!!
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post #239 of 429 Old 03-06-2009, 07:59 PM
clintb
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[QUOTE=Last Boyscout;6619420]I’m trying to understand why your installer put CJ pulleys and accessories on the 4.0. Unless you did not have the accessories or pulleys for the 4.0. It would be easier to get a CJ pump than trying to modify the XJ pump. What steering gear are you going to use? CJ or XJ?
I bought the unit this way and do not know who the installer was, had I done it myself would probably used 4.0 pulleys and stuff. I have since done as you recommend but originally had better (cheaper) access fot a 4.0 pump. All is well now and thanks for your reply.
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post #240 of 429 Old 04-03-2009, 08:11 PM
flashfludjr
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ok I have officially jumped into this swap. I was givin an 87 cherokee with the 4.0 and I have a cj with the 4.2. I have most of the wiring pulled off the cherokee. I know I just may be a little worried but im thinking if I only need those 5 wires you had said the harness will be a little thin.

I just follow those 5 wires and wherever they go is what I need to keep? and if a wire goes to lets say the crank sensor I will need to keep all the wires coming from the crank sensor? and so on with everything those 5 wires go to?

do you have any pictures or advice that will help me? I'm just a little worried I will trash something I need...
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