Jeep Strokers

it wont. either the depth or tooth count is different. pretty sure its the depth though.

INstaller is right, Ring gear on flywheel(flexplate) will not line up with the starter. IF you could locate a 4.0 starter this would be your best bet. They draw much less amperage and have more power. They do fail MUCH less often BUT do cost more to replace. I went with the 4.0 starter on my jeep just to get rid of the old MOTORCRAFT (or MOTOR-CRAP) starter! Hated them, hated them, hated them!

and ill second sixpak. as well, i cant justify this with fact, but the 4.0 starter is smaller, MUCH nicer, and im putting up a dollar that its lighter too. havent really had both around while i had a scale and thinking about it though. besides, newer parts are easier to replace.

I just swapped an OBD1 flywheel onto my 4.2.

I am using the AA nv-4500 belhousing, which allows me to run the 4.0 EFI's CPS.

As stated above, the 4.0 flywheels's ring gear is about 1/2" closer to the block than the ring-gear on the OEM 4.2's flywheel. This means that the aftermarket Powermaster starter that I was using on the 258 will not work, as the starter teeth are always engaged in the 4.0 flywheel teeth.

has anyone fabbed up an adapter/spacer to allow them to keep/use a 4.2 starter on a 4.0 flywheel?

Hello, I do have some experience with the 258 flywheels.

Stock on my '79 J10 with the heavy crankshaft, is 29.2 pounds. When I got it, the teeth were trashed, I was lucky to get home. The PO provided a replacement in the bed. Unfortunately, it only weighted 26.5 lbs. I weighed these on our digital bathroom scale. Wife was not happy. The rings did match up, as far as I could tell.
Are they otherwise interchangeable ? NO. Given the same bellhousing. The ring gear spacing from the crankshaft is off by 3/8", so your starter won't line up. I believe the stock 79 is 3/8 further spaced from the crankshaft.
Hmm, must swap ring. But not change composition of steel ring by overheat and local cooling. Hmm. Ok, it can be done with a kitchen oven and some patience, and a hammer, and a 2x4 and a flat garage floor and some cardboard.
I can't tell you with confidence exactly what the lighter flywheel came from, but it does make a difference.

if it had notches in the surface on the outside ring, it would be from a renix or newer 4.0. im not sure if there was a difference in the 199/232/258 flywheels in early years

so is it ok to run the lighter flywheel on the 258 crank in a stroker? to get the notches for the fuel injection, and match up to a 4.0 starter? Does the 4.0 starter bolt onto the old bellhousing ok ? In my case it's the aluminum housing in front of the T18.

- Landon

should be fine, i plan to do the same in my spirit. old bell, new flywheel, new starter.

You will need to modify the T-18 bellhousing for the TPS or move it to the front with a modified dampener.

I'm very sure the 4.0 starter will bolt up to the 4.2 bellhousing-- atleast I hope it will, as I plan on doing so with mine.

This is an older thread but as of 2017 Centerforce offers a steel flywheel that weighs 40.1 pounds. The stock 4.0L flywheel weights about 23.5 pounds. Finally an inertial flywheel for the I6.

I have been in search for more flywheel weight for a long time. My buddies with the old Dauntless V6 could lug down to such a low speed it was a joke. They could maximize their tire traction and go where I and my 232 couldn't. The old v6 had a massive flywheel for a 231 cu engine.

I found every AMC flywheel would bolt up to any AMC engine in the pre 80's. The stock clutch for a 232 was 10.5". A J10 was 11" with a heavier pressure plate. It would bolt onto any AMC flywheel.

I also found that the V8 flywheel off a 304 was 10 pounds heavier than my 232 flywheel. Then I learned the difference between internally balanced engines and externally balanced engines. The V8 is externally balanced. The straight 6 is internally ballanced. I didn't leave the 304 flywheel on my 233 long. A flywheel which is about 1 pound out of balance is most dramatic. But so is the extra weight.

flash443 wrote:I learned the difference between internally balanced engines and externally balanced engines. The V8 is externally balanced. The straight 6 is internally ballanced. I didn't leave the 304 flywheel on my 233 long. A flywheel which is about 1 pound out of balance is most dramatic. But so is the extra weight.

We had a CJ5 in the shop last fall that had a 304 in it, it had a 258 flywheel on it, it would just about BUZZ your teeth out!, we couldn't find a 304 flywheel to save our lives!??, the owner ended up buying a NEW Centerforce flywheel for a 360, I was able to match the weight to a 304 flexplate that I have, smooth as a baby's bottom when I got it put back together!