Full swap help

[BenM]

The fan is no big deal use electric fans for the radiator. I have done this swap on my 72 Gremlin. Went from a 232 one barrel to multipart fuel injection with overdrive.

I wouldn't worry about fans either. The big Ford/Lincoln electric fans are popular and move plenty of air. Your water pump should live longer without the stress. Good luck!

[Nightpath]

Not a bad bunch of ideas

Does the 4.0 need anything extra to attach to the stock Eagle automatic?

[carnuck]

Swap the XJ waterpump for one from a TJ or ZJ along with the fan. Leave the XJ fan in the parts pile.

[Nightpath]

Whats this pilot bushing / adapter thing needed for mating the 4.0 to the 998?

Or would it be easier to slam the XJ transmission in?

[carnuck]

You need a crank position sensor for the EFI to work. There is no hole in the Eagle 998 trans for one so you need to mod it and use a Wrangler 999 flexplate or get the harmonic balancer CP$ kit (@$400 last I checked)

I have a Wrangler 999 case I was going to put the internals of my 998 into but never got around to it. I used the original 999 internals to beef up a 904 from a 4 cyl XJ.

[BenM]

You need to pick up the flexplate used for 4.0 Wranglers and drill the case for the crank sensor. The Wrangler used the 4.0 with the 998/999. I'm pretty sure the one for the AW4 will push the torque converter back too far. You use the 4.0 starter with it.

Make sure the flexplate is for the correct computer, Renix or Chrysler.

Or use the 258 flexplate and a crank sensor relocation kit. You use the 258 starter then.

[Nightpath]

Head swap with a GM TBI starting to look better and better lol

[carnuck]

The 999 case is for sale!

[Nightpath]

OK, here's my 3 plans atm, barring something stupid happens and none happen. I am looking at a 94 XJ with low KM as the donor, with all hopes the engine is running good so it'll be my donor for a few different parts.

1 - Head swap - simple, carb it up and run with it. Swap in the 4.0 cam and whatever else for a bit more horsies.

2 - 4.0 swap - this seems to be the biggest headache of the bunch. Deciding to stay carb'd or go fuel injected is kind of a issue that I can't decide because of the 998 + CPS headache bit. Don't have the moola for the CPS relocation kit.

3 - Full 4.0 + transmission + t-case swap - keep it all, toss it in, cut the floor if need be and adjust the XJ transmission mount. Been thinking about this, haven't decided (do driveshafts have to be cut? Can the Eagle stock t-case be mounted to it?)



Although the 4.0 swap might seem like a headache, tossing in the 4.0 and staying carb'd until I can spring for the CPS relocation kit is kind of appealing. It seems rather simple and straight forward. Of course, I'd probably need a better carb than the mechanical Carter I have now to get the full oomph out of it.

Oh the decisions :/

[Nightpath]

Thinking of the carb'd 4.0 as the easiest swap until I save the dubloons for a CPS relocation kit.

Would there be a benefit of doing the head / cam / ? versus the 4.0?

[vangremlin]

I'm thinking that the engine swap would actually be easier than the head and cam swap, especially if you go with a carb.  Has anyone weighed in on the difficulty level of modifying the 258 bell housing for the 4.0 cps?  I know its another step, but it doesn't seem like it would be that difficult.  Would be good to hear from someone who has actually done it.

[Nightpath]

I think it was mentioned in this thread (or somewhere else) that to mate the 4.0 to the 998 and go fuel injected you need a flexplate from a Wrangler with the 3 speed, then a hole needs to be drilled in the precise location and a nut or whatnot welded on for the CPS to be relocated to.

It says here ( http://amceaglesden.com/guide/index.php?title=Can_I_swap_in_a_Chrysler_4.0%3F ) that a computer from  a manual Wrangler / Cherokee is needed if your not using the transmission from the Jeep as well. Any confirmation on this?

IMO, slapping in the 4.0 and getting it in there and keeping it carb'd while I beg the wife for the $$$ for relocation kit would be worth it.

[BenM]

With the Renix and ODB1 computer the transmission controller is separate. There are some minor differences, like idle speed. They can generally be changed one for the other, knowing that you may have to deal with idle speed issues or a chance of stalling at a sudden stop.

ODB II used an integrated computer. It doesn't like not knowing the transmission is there.

[carnuck]

You would be best to use a std trans CPU for teh correct fuel curves.

[Nightpath]

If I carb'd the 4.0, would the mechanical Carter do a good enough job, or would it have to be a beefier carb?