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post #1 of (permalink) Old 03-26-2002, 08:34 PM
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304

what is everyones opinion of swapping my dead 258 for a mild 304??
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post #2 of (permalink) Old 03-27-2002, 09:54 PM
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Re: 304

You usually need to give some more info on your jeep or in your profile to get a response but I think it is a great idea. You'd have to change one motor mount (think passenger side) but the bellhousings are the same. Most jeep autos in FSJs can handle the V8 as well as the manuals.What tranny do you have? The 304 is a little expensive to build but you can go up to a 401 (they are the same size). I think you may have to reroute the fuel line depending on where it comes up and maybe upgrade your radiator depending on how many cores? You might also have to rework the throttle linkage to get it to work but it is a relatively easy swap. Good luck.
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post #3 of (permalink) Old 04-02-2002, 06:04 PM
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Re: 304

thanx. i edited my profile with a little more info. i have a 1/2 ton j truck with a three speed.
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post #4 of (permalink) Old 04-02-2002, 11:29 PM
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Re: 304

The T-15 is a good tranny from what I've heard. I have one in my Commando but it is undergoing a major rebuild so I can't swear to how good it is personally. They were put in FSJs with up to 360s from the factory and it seems that your wheeling is pretty light so it should be fine. Good luck with the swap!
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post #5 of (permalink) Old 04-24-2002, 02:41 AM
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Re: 304

I did the reverse to my truck. Put a 6 in place of an 8. (Personal preference.) You will have to remove the two steel plates attached to the engine mount frame "arms", and grind away the weld. The tranny should bolt up, but you will need a new flywheel for the 8cyl. Trying to re-use the 6cyl flywheel is a waste of time.
post #6 of (permalink) Old 04-26-2002, 09:42 PM
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Re: 304

well, the Six cyl flywheels are differntly balanced then the V8 flywheels.

Early 304s were really strong, emmission equipment really hurt them (so much that 258s were just behind them power wise in their last years) But im sure that the OEM emssion controls on your truck have been plugged, destroyed, worn out or sabotaged, [img]images/icons/wink.gif[/img] so that it wont matter. mild 304s are plenty strong.

Jesse
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