4.0 swap in the j10

[notquitemusashi]

I?m going to do a 258 ?> 4.0 swap. I have a 93 Xj donor rig.

My question is, what are y?all using for clutch disc and pressure plate? I was plannng on cutting the bell housing for the cps and using a flywheel from a 4.0.

[72jeeperjoe]

You can use your 258 flywheel, you?ll just have to have a machine shop put a new starter ring on. If you keep the 258 flywheel then you can use the 82 clutch etc.

[notquitemusashi]

I was gonna try and use a flywheel from a 4.0 for the cps. PP won?t bolt to it?

[72jeeperjoe]

I?m not sure if the 258 pp bolts up to the 4.0 flywheel. I know if you use the cps relocation kit you don?t have to deal with it at the flywheel but the kit is 300 plus dollars. If you use the 4.0 flywheel you would use the 4.0 pp and clutch. You would keep the hydraulics from your transmission.

[Cecil14]

You need to use the 4.0L flywheel, as the starter and ring gear are set a different depth out from the engine to accommodate the Mitsubishi starter instead of the older Ford starter on the 258.

edit: Reread your original post...looks like you're planning to keep the trans from the 258? If that's the case, you need to use the 258 parts. The flywheel needs to match the bellhousing, basically. You should be fine using the 258 flywheel on the 4.0L, both are neutrally balanced.


aa

[72jeeperjoe]

You need to use the 4.0L flywheel, as the starter and ring gear are set a different depth out from the engine to accommodate the Mitsubishi starter instead of the older Ford starter on the 258.

edit: Reread your original post...looks like you're planning to keep the trans from the 258? If that's the case, you need to use the 258 parts. The flywheel needs to match the bellhousing, basically. You should be fine using the 258 flywheel on the 4.0L, both are neutrally balanced.


aa

Thanks for the clarification on that. I was under the impression that the 4.0 flywheel bolted up without an issue. I do believe that you can have a machine shop put a new stater ring gear onto the 258 flywheel to match up.

[Cecil14]

The bolt pattern and clocking are both the same, but I know I had engagement issues when I tried using the 258 starter and 4.0L flywheel. I just went and got a Mistubishi starter and that solved the whole thing. I believe the tone ring is part of the flywheel on the 4.0L, but might be remembering that incorrectly? If it is truly just a difference in ring gear, that should only be a few bucks to have swapped, as you mentioned.

I would think that the stick-out length, or the clutch engagement surface, would be the same between the two flywheels, and I know I checked that a million years ago when I was building the stroker, but I don't recall for sure anymore. I would definitely check that, as it will impact which clutch parts you need; more on the side of throw out bearing than the plate and disk.


aa