It's hard to tell for sure from the picture of the 401, but it looks like the PO removed the radiator fan clutch and replaced it with a spacer. He might have done that because he used the donor vehicle for towing. But, in a CJ, it's not necessary, and you might consider installing a fan clutch again.

 

I can't see the other side but the Chero WT looks to be in very good shape. What's wrong with it?

The 401 should be a blast in the CJ!

 

I also have a 401 that I will be dropping in my 1976 CJ5. Will be watching your thread!

 

Will you ship me your manifolds? I need some for my 401 CJ 7????

 

got a set off my 360 that you can have if you pay the shipping

 

Oh and by the way, mine is ridiculously strong. It is sporty to say the least...

 

Possibly. Not sure if I was gonna ditch the crappy Hedeman Headers and go with the stock mainifolds. Let me think her over bud.

 

Quick question. The flywheel off my 360 should swap right onto the 401 right? I noticed the mounting surface was somewhat different. The 401 has a little flange that the 360 doesnt.

Also, wheres a good place to get a pilot bushing as I dont think I will be able to remove the one on the 360, and not sure that they are the same anyways as I dont have a micrometer.

 

you can get a pilot bushing from napa or novak-adapt, they are the same. 401 and 360 are externally balanced and the harmonic and flywheel are different

 

so are you saying Im gonna need a new fly wheel?

 

Yes, as SPK454 stated you need a different flywheel..AMC engines are externally balanced so you will need a 401 flywheel. You can probably get a pilot bushing at Advance Auto or Auto Zone.

 

Damn that sucks. Is there any difference in the flywheels when using an automatic transmission or a manual transmission? I have the flywheel that came with the 401 that mated to the torque converter, could I use that and put on my clutch I was using for the 360 flywheel that mates to the ford t-18 manual transmission Im running?


Also, can you guys explain to me what you mean by externally balanced and whats the harmonic?

Thanks for helping me learn.

 

Externally balanced means the flywheel is weighted to balance the motor and the front has a harmonic balancer. The harmonic is the balancer on the front of the motor behind the crank pulley. The fly wheel or flexplates are motor specific as in 401/360/304/ and as long as the 401 had the same tranny behind it you can use it. If not all the auto part stores can get a flexplate if you can tell them what motor and tranny combo.

 

Thanks for the help again. Im just wanting to make sure I get all the facts straight. So I will not be able to use the clutch that was on the 360 flywheel with that of the 401 flywheel?

Thanks again for all the input. When I did the 360 swap I had my friend to help me and guide me on the swap along with this forum. This time Im on my own swapping the engine as he is an hour away so Im relying on you guys to keep me in the right direction.

 

Thanks for the help again. Im just wanting to make sure I get all the facts straight. So I will not be able to use the clutch that was on the 360 flywheel with that of the 401 flywheel?

You can use the clutch, assuming it's in good condition. Now's the time to replace it, if it's at all, questionable. You must use a 401 specific flywheel with your T-18, the flexplate is not the same thing and will not work with a stick shift. The flex plate should be specific to a T400/350.

 

You will need a 401 flywheel for a manual tranny. The flexplates for automatics are much much thinner. you should however be able to use the same clutch. Be sure to check the throwout bearing, and clutch discs for wear. i don't know if you replaced them with the last swap, but if not, it would be a good time while the motor is already out.

 

Thanks John and jp360cj. I forgot about the thickness being different between the autos and the manuals.

The clutch was brand new when I did the 360 swap a year and a half ago and it didnt get tons of mileage on it as the jeep is just for wheelin.

Thanks again fellas. Im sure I will have more questions as I get further into the swap

 

One more thing that just popped up while out in the garage looking over the engine. Im missing one of the dowel male things on the back on the engine block that mates into the transmission from the engine block. I have both on the 360 and am wondering how to get one removed so I can put it into the 401 block. Its the round hollow cylinder deal. Pic for reference below.

How does one remove it? Can I punch it out from the little hole in the front or should some vice grips get it out? Or can I buy one somewhere? Couldnt find anything on any of the engine parts websites.

Thanks

 

I had the same problem and used vice grips. just a couple twists and it came right out. then used a rubber hammer to put it in the other motor

 

Cool. Will give it another try tonight.