4.0 flexplate

[maddog]

I have a question for those of you that have a 4.0 fuel injection system in your eagle and used the 998 transmission. Did you use the Cherokee flex plate with the crank position sensor ring? If so did you modify it to fit the eagle torque converter or did you get a torque converter for a different vehicle?

[89 MJ]

If I were you, I'd consider swapping to the Jeep auto trans too and gain the overdrive.

[maddog]

I have the wiring harness for an ax-15 manual transmission and I'm only planning on using the 998 as a temporary deal. I have to move in a month and a half and I would like to have the car drivable before then, so I don't have time to get another transmission and modify a bunch of other stuff to make that work. Also I don't have a ton of money I can throw at it and still be able to move.

[89 MJ]

Understood. Follow up question. What year fuel injection stuff are you using? 87-90, 91-95, or 97-06?

Seems like your options are either forking out hundreds to swap to a front mounted CPS or use the Cherokee flex plate redrilled to the Eagle torque converter bolt pattern.

I gathered that from this thread, but it's a little bit of a cluster f.
https://forums.4wdmechanix.com/topic/951-jeep-40l-engine-swap-into-1984-jeep-cj-7-42l-with-904999-automatic-transmission/

[maddog]

Mine is from a 93. And that's kind of what I was figuring I would have to do as far as the flexplate goes.

[89 MJ]

Ok. It might be worthwhile to check and see if the Wrangler used the same transmission as the Eagles. Then you could use maybe that flexplate and torque converter, but that's more money. Remember, you'll also need a hole in your bellhousing for the CPS to see the flexplate.

[EagleSX4_5Speed]

I also have a 93 4.0 liter in my Eagle. However I have a manual transmission. I am using the hesco front crank position relocation kit and have not had any issues with it. They make 2 versions of that kit one for the serpentine belt accessories and one for the v-belt accessories. I am running the original Eagle 4.2 liter v-belt accessories on my engine. I just checked and the price has gone up since I purchased my kit. As of right now their website shows that the serpentine belt version is out of stock but they have the v-belt version in stock.

Hesco 4.0 conversion parts

If you want the cheapest route I would definitely drill some new holes in the 93 flex plate and try to make that work. The biggest issue you will run into is making a hole in the bell housing for the CPS. And getting it in the right spot. The timing is "adjusted" on those 4.0's by moving the CPS. The distributor does not adjust the timing like on the 4.2.

[EagleSX4_5Speed]

Also you will need to sort out the speed sensor. Hesco sells one that has a machined adapter for the Cherokee style speedometer cable. But it is more than it should be.

I have found a solution that will save you a few dollars. Buy a speed sensor from a early 90's Dodge Dakota. Rockauto link for speed sensor.

The tricky part is finding a cable and adapter. For the cable order one for an 84 Jeep Cherokee. It will attach to the Eagles speedometer. For the adapter you will need to go to a junkyard and find a 87-90 Jeep Cherokee with cruise control. The adapter you are looking for is behind the gauge cluster attached to the cruise speed sensor.

Also grab the speedometer gear housing and gear from the same 87-90 Jeep Cherokee. It will swap right into the factory eagle transfer case.

All of those parts will let you have a functioning factory speedometer and speed sensor.

[maddog]

I have the two piece speedo cable in my eagle for the dealer added cruise control, is that going to be a problem? As for the sensor hole I am using the AX15 I have as guide. On a side note, how much modification is required to convert from automatic to manual?

[EagleSX4_5Speed]

The hardest parts to find will be a manual transmission pedal box and clutch master cylinder that fits. There is not a lot of room for it. I think that AMC used one from a Jaguar as the original is a Girling branded unit.

The other issue you will run into is the transfer case. The AX15 will not bolt up to the factory transfer case without a spacer. The splines do match up and the bolt pattern is the same but the NP129/128 has a longer snout beyond the mating surface and it will require a spacer of about 1 inch to get it to bolt together.

You can swap to a NP231 or NP242 which will bolt right up to the AX15 but you will also need to get a Slip Yoke Eliminator for either of those cases.

I also think the AX15 is longer than the factory transmissions so you may need to bash the floor to get the transfer case to fit. If it is longer you will also need to have your driveshafts modified accordingly.

[EagleSX4_5Speed]

I don't have cruise control in my Eagle so I don't know what parts they used. If they used the same system as the 87-90 Jeeps you could just get a speedo cable from one of those. They also used a 2 piece speedometer cable for the cruise control.

[89 MJ]

I don't have cruise control in my Eagle so I don't know what parts they used. If they used the same system as the 87-90 Jeeps you could just get a speedo cable from one of those. They also used a 2 piece speedometer cable for the cruise control.

The factory Eagle cruise stuff is the same Dana kit that our Renix Jeeps had.

[maddog]

I don't have cruise control in my Eagle so I don't know what parts they used. If they used the same system as the 87-90 Jeeps you could just get a speedo cable from one of those. They also used a 2 piece speedometer cable for the cruise control.

The factory Eagle cruise stuff is the same Dana kit that our Renix Jeeps had.

Okay so the 87-90 XJ's used the same ones as my 80 wagon did, that's good to know. As for the transfer case I do eventually want to change that out anyway. And I actually have the pedal assembly.

[maddog]

So I just did some looking online, as well as measuring both my automatic and the ax15, and it looks like the ax15 is about an inch and a half longer than the automatic.

[mudkicker715]

Don't forget that the cross member is different between auto and manual.