89 GW OBD1 4.0 swap ?s

[Stuka]

The 32re is basically a 4sp TF904 as I recall. I think the 42re will be a closer fit.

Do you have an ECU from a manual Trans 4.0? An auto ECU won't be happy not having a transmission to talk to.


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[carnuck]

258 and 4.0 are internally balanced. You could drill the holes for the 727 but does the converter slide all the way against the plate?

32RE is the 904, 42RE is the overdrive (first number is how many speeds it has)

[GWag89]

I don't have an ecu yet but I am aware that I will need one from a manual.

I have not attempted to marry the engine and trans with the flex plate bolted to the motor yet. I was so discouraged after finding that it didn't fit the torque converter I stepped away for a few days.

At one point i had considered drilling the holes to fit the 727. That was actually my first reaction but something in my head told me to double check before I screwed something up.

Why won't the 258 flex plate for the 727 work? Is it because my starter is the newer style xj, starter?

[GWag89]

Another idea is use a TC and flex plate from another trans that will slip into the input shaft of the transmission and bolt to the 4.0

What spline input is the 727 and does anyone know if any other TC s will work?

[carnuck]

Unless it's lockup, nothing else. 45 or 47RFE "MAY" fit a lockup.

[jaber]

I don't have an ecu yet but I am aware that I will need one from a manual.

I have not attempted to marry the engine and trans with the flex plate bolted to the motor yet. I was so discouraged after finding that it didn't fit the torque converter I stepped away for a few days.

At one point i had considered drilling the holes to fit the 727. That was actually my first reaction but something in my head told me to double check before I screwed something up.

Why won't the 258 flex plate for the 727 work? Is it because my starter is the newer style xj, starter?

The 258 flywheel wont have the CPS ring on it, meaning you'll have to do aftermarket.

I personally would not be afraid to take a die grinder and oblong the bolt holes for it to bolt up. Mark each one so your taking the same amount of material out of each hole so the balance stays close.

[GWag89]

It almost bolts up. That's why it's so tempting to drill it!

I've had multiple people say modify the plate I have now and I think that's what I'm going to try. It seems like a better option than trying ever flexplate in the torque flite family

[GWag89]

96 42re plate works! I just bolted it too the converter.

[jaber]

SWEET!!!

[carnuck]

Is there a tone ring on the backside?

[GWag89]

Yes it has a tone ring. It's a 96 grand Cherokee flex plate. I have pics

[carnuck]

As long as it's off a 4.0 and not 5.2 and you're going to run HO EFI, you're good to go then!

[GWag89]

Check. On the 4.0
Check. On the efi

Seems like an unusual combo but it really doesn't involve that many specialty parts.

I used the trans and t case I already have. Purchased a flex plate and fsj motor mounts for my 4.0. A fuel system for efi. Computer and wiring harness.

Pretty simplistic once the research and trial and error are worked out

[Stuka]

Check. On the 4.0
Check. On the efi

Seems like an unusual combo but it really doesn't involve that many specialty parts.

I used the trans and t case I already have. Purchased a flex plate and fsj motor mounts for my 4.0. A fuel system for efi. Computer and wiring harness.

Pretty simplistic once the research and trial and error are worked out

It needs to be an HO EFI. The remix system won't work for what you want.


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[GWag89]

I'm running a 94 4.0 from an xj. It is obd1.

[carnuck]

That's HO. All after 08/90 are HO